JP7390792B2 - fire alarm equipment - Google Patents

Description

The present invention relates to fire alarm equipment that monitors fires by connecting a terminal including a fire detector and a short circuit isolator to a loop transmission path from a receiver.

Conventionally, in fire alarm equipment known as type R, a terminal device such as a fire detector equipped with a transmission function is connected to a transmission line led out from a receiver, and when a fire is detected, the fire alarm Based on the fire interrupt from the system, a search command is issued to identify the address of the fire detector that triggered the alarm, display the address where the fire occurred, and collect and monitor fire data from the identified fire detector. There is.

In this way, knowing the address of the fire detector that detected the fire makes it possible to carry out appropriate evacuation guidance and fire extinguishing activities, making it an essential function especially for fire monitoring in large-scale facilities.

In addition, in order to ensure reliability against disconnection failures in the transmission line led out from the fire receiver, fire alarm equipment is installed that monitors fires by connecting a fire detector to the loop transmission line connected to the receiver in a loop. It has been known.

FIG. 17 is an explanatory diagram of a fire alarm system using a conventional loop transmission line. As shown in FIG. 17, a transmission path 12 using a pair of signal lines is led out from a transmission section 100 provided in a receiver 10, and after being led out from the receiver 10, the transmission path 12 is connected to the receiver 10 again. Arranged in a loop that goes back. In the following description, the transmission line 12 connected in a loop to the receiver 10 will be referred to as the loop transmission line 12.

A fire detector 16 with a transmission function is connected between the signal lines of the loop transmission line 12, a unique terminal address is set to the fire detector 16, and voltage control is performed from the transmission section 100 to change the line voltage. Fires are monitored by transmitting signals (downstream signals) and from the fire detector 16 transmitting current response signals (upstream signals) that change the line current.

Furthermore, short circuit disconnection devices 18 known as short circuit isolators are connected along the loop transmission line 12 at predetermined line lengths and line positions.

At the end of the loop transmission line 12 led into the receiver 10, a termination switch 102 is provided to switch and connect the signal line at the end to the transmission section 100. In the normal monitoring state, the termination switch 102 is turned off and loop transmission is stopped. The end of the line 12 is separated from the transmission section 100.

If a disconnection 104 occurs in the middle of the loop transmission line 12 during operation, the termination voltage of the loop transmission line 12 is cut off, the disconnection is detected, the termination switch 102 is turned on, and the termination switch 104 is connected to the end of the loop transmission line 12. A transmission section 100 is connected.

Therefore, the voltage control signal from the transmission section 100 is transmitted from the end of the loop transmission line 12 to the location where the disconnection 104 occurs via the termination switch 102, and between the location where the disconnection 104 occurs and the end of the loop transmission line 12. It becomes possible to send and receive signals to and from the fire detector 16 connected between the loop transmission line 12 and the fire monitoring function of the fire detector 16 connected to the loop transmission line 12 will be lost even if a disconnection fault occurs. High reliability can be obtained.

If a short circuit occurs in the loop transmission line 12 during operation, the short circuit disconnection devices 18 located on both sides of the short circuit turn off the switch 46 to disconnect the short circuit from the loop transmission line 12. When the short circuit is disconnected by the short circuit disconnection device 18, the termination voltage of the loop transmission line 12 is disconnected as in the case of disconnection, and the voltage monitoring unit detects the disconnection and turns on the termination switch 102, thereby disconnecting the transmission unit. The terminal control signal from 100 is transmitted from the termination side of the loop transmission line 12 to the location where the disconnection 104 occurs via the termination switch 102, so that even if a short-circuit failure occurs, the terminal control signal from the loop transmission line 12 connected to the fire The fire monitoring function of the detector 16 is not lost, and high reliability can be obtained.

Japanese Patent Application Publication No. 2008-004033 Japanese Patent Application Publication No. 2010-114632

However, in such conventional fire alarm equipment equipped with a loop transmission line, when a disconnection occurs in the loop transmission line 12, the receiver 10 monitors the terminal voltage by the voltage monitoring unit and the receiver 10 detects the loop transmission line. 12, and by receiving a response signal from the short-circuit disconnection device 18 in response to a call signal specifying the terminal address from the start and end sides, the start and end groups corresponding to the breakage point are connected. However, there is a problem in that it is not possible to specify where in the loop transmission line 12 the disconnection has occurred, and it takes time and effort to discover and repair the disconnection point.

Furthermore, when the receiver 10 is started up, the order in which the short-circuit disconnection device 18 is connected to the receiver is from the starting end of the loop transmission line 12 if the loop transmission line is normal; If a short circuit or disconnection occurs, the connection order is from the start and end of the loop transmission line 12 to the short circuit or disconnection position, but the receiver 10 disconnects the short circuit according to the state of the loop transmission line 12. In addition to the problem that the connection order of the devices 18 is not recognized and the disconnection location cannot be identified, there is also the problem that the operation and management of the loop transmission line 12 provided with the short-circuit disconnection device 18 cannot be adequately managed.

SUMMARY OF THE INVENTION An object of the present invention is to provide a fire alarm system with improved reliability by appropriately managing the operation of a loop transmission line provided with a short-circuit disconnection device, including identifying the location of a disconnection.

(Fire alarm equipment)
The present invention
receiver and
a plurality of short-circuit disconnection devices connected in series to the loop transmission line connected to the receiver and switching the connection state of the transmission lines located on both sides of the loop transmission line;
In fire alarm equipment equipped with
The short circuit disconnection device is
It has a unique address on the loop transmission path,
When power is not supplied and when power supply starts, the transmission line is disconnected,
When a startup call signal including a unique address is received from the receiver after the start of power supply, the transmission path is brought into a connected state and a startup response signal is sent to the receiver;
The receiver stores, as connection order information, that the short-circuit disconnection devices are arranged in the order in which the activation response signal is received;
When a short circuit occurs in a given transmission line of the loop transmission line,
The short-circuit disconnection devices located on both sides of the transmission line where the short circuit has occurred perform a short-circuit disconnection operation to disconnect the transmission line, and also output a short-circuit disconnection operation signal as a call response signal corresponding to the call signal from the receiver. send,
The receiver identifies the short circuit location based on the short circuit disconnection operation signal and connection order information,
When a disconnection occurs in a specified transmission line of the loop transmission line,
The receiver is characterized in that it detects a disconnection and identifies the location of the disconnection based on a call response signal in which no short-circuit condition is detected from a short-circuit disconnection device corresponding to a call signal from the receiver and connection order information.

(Identification of track fault locations)
receiver and
a plurality of short-circuit disconnection devices connected in series to the loop transmission line connected to the receiver and switching the connection state of the transmission lines located on both sides of the loop transmission line;
In fire alarm equipment equipped with
The short circuit disconnection device is
It has a unique address on the loop transmission path,
When power is not supplied and when power supply starts, the transmission line is disconnected,
When a startup call signal including a unique address is received from the receiver after the start of power supply, the transmission path is brought into a connected state and a startup response signal is sent to the receiver;
The receiver is
storing as connection order information that the short-circuit disconnection devices are arranged in the order in which the activation response signal is received;
When a line fault is detected due to a disconnection or short circuit in the loop transmission line, a call signal is sent to the short circuit disconnection device from the starting end and the terminal end of the loop transmission line,
Among the call response signals corresponding to the call signal from the start end, the short circuit disconnection device is identified as the last short circuit disconnection device on the start end based on the call response signal corresponding to the short circuit disconnection device closest to the end end in the connection order information,
Among the calling response signals corresponding to the calling signal from the terminating side, identifying the short-circuit disconnecting device as the last short-circuit disconnecting device on the terminating side based on the calling response signal corresponding to the short-circuit disconnecting device closest to the starting end side in the connection order information,
It is identified that there is a line fault location between the last short-circuit disconnection device on the starting end side and the last short-circuit disconnection device on the termination side.

(Identification of track fault location when two track faults occur )
If the last short-circuit disconnection device on the start-end side and the last short- circuit disconnection device on the termination side are not adjacent in the connection order information, the receiver can connect multiple The connection order information that identifies the presence of a line fault location is stored.

(Short circuit disconnection device)
When a short circuit occurs in a predetermined transmission line of the loop transmission line, short circuit disconnection devices located on both sides of the transmission line where the short circuit has occurred perform a short circuit disconnection operation to disconnect the transmission line.

( Identification of disconnection points and short circuit points)
The short-circuit disconnection device transmits a short-circuit disconnection operation signal to the receiver as a call response signal when performing the short-circuit disconnection operation,
The receiver is
When a short circuit is detected by receiving a short circuit disconnection operation signal, it is determined that there is a short circuit between the last short circuit disconnection device on the start end side and the last short circuit disconnection device on the end side,
If a disconnection is detected without receiving a short-circuit disconnection operation signal, it is determined that there is a disconnection location between the last short-circuit disconnection device on the start end side and the last short-circuit disconnection device on the termination side.

(Inrush current limiting configuration of short-circuit disconnection device)
The short circuit disconnection device is
A switch that changes the connection status between transmission lines,
a current limiting resistor connected in series with the switch;
a current limit release switch connected in parallel to the current limit resistor;
Equipped with
When the transmission line is connected by a switch, power is supplied from the primary side to the secondary side via a current limiting resistor to limit the current, and when a predetermined inrush current setting time has elapsed, the current limit is released via a current limit release switch. Switch to power supply and cancel current limit.

(Notification of disconnection and short circuit of short circuit disconnection device)
The short-circuit disconnection device notifies short-circuit disconnection when a short-circuit disconnection operation is performed,
The receiver transmits a signal indicating the last short-circuit disconnection device to the last short- circuit disconnection device on the starting end side and the last short-circuit disconnection device on the termination side when detecting the disconnection,
The short-circuit disconnector that receives the signal indicating the last short-circuit disconnector notifies the disconnection.

(Node map display)
The receiver generates and displays a node map regarding connection order information.

(Distributed system relay board)
One or more relay boards are connected to the receiver via a network line, and a terminal including a fire detector and a short-circuit disconnection device is connected to the loop transmission line connected to the relay board to monitor fires. In fire alarm equipment configured with a distributed system that notifies the receiver and outputs a fire alarm when a fire is detected,
The short circuit disconnection device is
It has a unique address on the loop transmission path,
When power is not being supplied and when power is being supplied, the transmission lines located on both sides of the loop transmission line are disconnected.
When a startup call signal including a unique address is received from the relay board after power supply starts, the transmission line is connected, and a startup response signal is sent to the relay board;
The relay board is
Sends information that the short-circuit disconnection devices are arranged in the order in which the activation response signal is received to the receiver as relay board connection order information;
When a short circuit occurs in a given transmission line of the loop transmission line,
The short-circuit disconnection devices located on both sides of the transmission line where the short circuit has occurred perform a short-circuit disconnection operation to disconnect the transmission line, and also output a short-circuit disconnection operation signal as a call response signal corresponding to the call signal from the repeater board. send,
The relay board identifies the short circuit location based on the short circuit disconnection operation signal and the relay board connection order information, and transmits the relay board connection order information that identifies the short circuit location to the receiver,
When a disconnection occurs in a specified transmission line of the loop transmission line,
The relay board detects a disconnection, and identifies the disconnection location based on the call response signal from the short-circuit disconnection device that corresponds to the call signal from itself and the relay board connection order information, and identifies the disconnection location. The relay board connection order information is sent to the receiver.

(Storing connection order information)
receiver and
a plurality of relay devices connected in series to a loop transmission line connected to the receiver;
In fire alarm equipment equipped with
The relay device has a unique address on the loop transmission path,
The receiver is
Store connection order information that is the order in which relay devices are arranged in the loop transmission path,
When detecting a break in the loop transmission line,
Sending a call signal to the address of the relay device from the start and end sides of the loop transmission line,
Among the call response signals corresponding to the call signal from the start end, the last relay device on the start end is identified based on the call response signal corresponding to the relay device closest to the end end based on the connection order information,
Among the call response signals corresponding to the call signal from the termination side, the last relay device on the termination side is identified based on the call response signal corresponding to the relay device closest to the start side based on the connection order information,
The present invention is characterized by storing connection order information specifying that there is a disconnection point between the last relay device on the starting end side and the last relay device on the terminating end side .

(basic effect)
The present invention provides a fire alarm system equipped with a receiver and a plurality of disconnection devices connected in series to a loop transmission line connected to the receiver to switch the connection state of the transmission line. The loop transmission path has a unique address, and when the power is not being supplied and when power is being supplied, the transmission path is disconnected, and when a startup call signal containing the unique address is received from the receiver, the transmission path is connected, and a startup response is issued. The receiver stores the connection order information indicating that the disconnection devices are arranged in the order in which the activation response signals are received, so that the activation call signal and activation response signal are transmitted when the receiver is started up. By receiving this, the connection order of the plurality of short-circuit disconnection devices in the loop transmission path is detected, and the connection order of the short-circuit disconnection devices can be grasped.

(Effects of identifying the disconnection point at the time of disconnection)
In addition, when detecting a disconnection in the transmission line, the receiver transmits a calling signal from the starting end and the terminating end of the loop transmission line to the disconnection device, and uses the connection order information from among the response signals corresponding to the calling signal from the starting end. It is identified as the last disconnection device on the start end side based on the response signal corresponding to the disconnection device closest to the termination side, and among the response signals corresponding to the call signal from the termination side, the disconnection device closest to the start end side according to the connection order information is identified as the last disconnection device on the start end side. It is identified as the last disconnection device on the termination side based on the response signal corresponding to the device, and the connection order information that specifies that there is a disconnection point between the last disconnection device on the start side and the last disconnection device on the termination side is stored. As a result, the last disconnection device on the start end and the last disconnection device on the termination side can be determined, making it possible to easily and accurately determine the location of a break in the loop transmission line, and by understanding the location of the break, repair work can proceed efficiently. .

(Effects of identifying the disconnection point when there are two disconnections)
In addition, if the last disconnection device on the start end and the last disconnection device on the end end are not adjacent in the connection order information, the receiver detects multiple disconnection points between the last disconnection device on the start end and the last disconnection device on the end end. Since the connection order information that specifies that the connection order is The two disconnection positions existing between the short-circuit and disconnection devices with the last number in the termination order that have not been connected can be easily and accurately identified, and repair work can be efficiently carried out by understanding the short-circuit positions.

(Effect of short circuit disconnection device)
In addition, when a short circuit occurs in the loop transmission line, the disconnection devices located on both sides of the short circuit disconnect the transmission line, disconnecting the short circuit from the loop transmission line. Since short-circuit disconnection is performed, by disconnecting the short-circuited part of the loop transmission line, monitoring by the sensor, transmitter, etc. connected to the loop transmission line in front of the disconnection device that performed the disconnection can continue normally. can be done.

(Effects of identifying the short-circuit location at the time of short-circuit)
In addition, when the short circuit disconnection device performs a short circuit disconnection operation, it transmits a short circuit disconnection operation signal to the receiver, and the receiver identifies the short circuit disconnection device on the start end side based on the short circuit disconnection operation signal received from the start end side. Then, the terminal side short-circuit disconnection device is identified based on the short-circuit disconnection operation signal received from the termination side, and connection order information identifying that there is a disconnection point between the start-side short circuit disconnection device and the termination side short-circuit disconnection device is provided. Since it is memorized, it is possible to easily and accurately grasp the two short-circuit disconnecting devices in the short-circuit disconnected state of the loop transmission line and the short-circuit position between them, and to efficiently proceed with the repair work by grasping the short-circuit position.

(Effect of inrush current limiting configuration of short-circuit disconnection device)
In addition, the short-circuit disconnection device includes a switch that disconnects the loop transmission line, a current-limiting resistor connected in series with the switch, and a current-limiting release switch connected in parallel to the current-limiting resistor. When the line is connected, power is supplied from the primary side to the secondary side via the current limiting resistor to limit the current, and when the predetermined inrush current setting time has elapsed, the loop transmission line is connected using the current limit release switch. As a result, when the short-circuit disconnection device is turned on by the activation call signal from the receiver, an inrush current flows toward the secondary side, but the inrush current is limited by the current-limiting resistor, and a short circuit occurs. To surely prevent a receiver side from erroneously determining an inrush current due to switching on of a disconnection device as an overcurrent.

(Effect of notification of disconnection and short circuit of short circuit disconnection device)
In addition, the short-circuit disconnection device notifies short-circuit disconnection when a short-circuit disconnection operation is performed, and the receiver sends a signal indicating the last short-circuit disconnection device to the last disconnection device on the start end and the last disconnection device on the termination side when detecting a disconnection. The short-circuit disconnecting device that transmits the signal and receives the signal indicating the last short-circuit disconnecting device will notify the disconnection, so the short-circuit disconnecting device that disconnected the short circuit due to the occurrence of a short circuit in the loop transmission line will indicate this with the indicator light. In addition, the disconnection devices located on both sides of the loop transmission line disconnection point can be used to notify the operator of the disconnection by the operation of an indicator light, etc., making it possible to identify the short-circuit or disconnection point of the loop transmission line on-site. It is simple and easy to do.

(Effect of node map display)
In addition, since the receiver generates and displays a node map related to connection order information, the display of the node map on the receiver indicates that a loop transmission line equipped with multiple short-circuit disconnectors is functioning normally. In addition, it is possible to easily and accurately know the order in which multiple short-circuit disconnection devices are connected to a receiver, the location of a disconnection when a disconnection occurs, and the location when a short circuit occurs, making it possible to appropriately manage the operation of the loop transmission line and improve the reliability of the equipment. can be increased.

(Effects of relay boards in distributed systems)
In another embodiment of the present invention, one or more relay boards are connected to the receiver via a network line, and a fire detector and a short-circuit disconnection device are installed on the loop transmission line connected to the relay boards. A distributed system is configured that connects terminals including terminals to monitor fires, and when a fire is detected at a relay panel, notifies the receiver and outputs a fire alarm. The transmission line is disconnected when power is not supplied and when power supply is started, and when an activation call signal including a unique address is received from the relay board, the transmission line is connected and a activation response signal is sent, and the relay board transmits information indicating that the disconnection devices are arranged in the order in which the activation response signal is received to the receiver as relay board connection order information, and the receiver generates and displays a relay board node map regarding the relay board connection order information. As a result, a node map showing the connection order of the short-circuit disconnection devices on the loop transmission line connected to the relay panel is displayed for the short-circuit disconnection device of the loop transmission line pulled out from the relay board connected to the receiver, and the short-circuit disconnection device is displayed. It is possible to easily and accurately know the operating state based on the connection order of the disconnecting devices.

(Effects of disconnection and short circuit indications based on relay board connection order information)
In addition, when a break in the transmission line occurs, the repeater detects the break and sends relay board connection order information that identifies the disconnection location to the receiver based on the response signal of the short-circuit disconnection device and the repeater board connection order information. When a short circuit occurs in the transmission line, the short-circuit disconnection device sends a short-circuit disconnection signal to the relay panel when performing a short-circuit disconnection operation, and the relay panel identifies the short-circuit location based on the short-circuit disconnection operation signal and connection order information. The relay board connection order information that has been identified is sent to the receiver, and the receiver generates and displays a relay board node map regarding the relay board connection order information. Regarding the loop transmission line short-circuit disconnection device, a node map showing the short-circuit or disconnection points of the loop transmission line connected to the repeater board is displayed, allowing you to easily and accurately identify the short-circuit or disconnection points and make repair work more efficient. You can proceed well.

Block diagram showing details of the transmission section and terminal when the receiver is started up with the loop transmission path in normal condition. Block diagram showing details of the transmission unit and terminal when starting up the receiver when the loop transmission path is normal. Time chart showing downlink signals and uplink signals sent and received by the transmission unit Circuit block diagram showing an embodiment of a short circuit disconnection device Explanatory diagram showing the node map displayed when the loop transmission path is normal Block diagram showing details of the transmission unit and terminal when there is a short circuit in the loop transmission path Explanatory diagram showing the node map displayed when there is a short circuit in the loop transmission path Block diagram showing details of the transmission unit and terminal when there is a short circuit in two places on the loop transmission line Explanatory diagram showing the node map displayed when there is a short circuit in two places on the loop transmission line Block diagram showing details of the transmission unit and terminal when there is a disconnection in the loop transmission line Explanatory diagram showing the node map displayed when there is a break in the loop transmission line Block diagram showing details of the transmission unit and terminal when there is a disconnection in two places in the loop transmission line Explanatory diagram showing the node map displayed when there is a disconnection in two places on the loop transmission line Flowchart showing receiver startup control Flowchart showing short-circuit disconnection device start-up control An explanatory diagram showing an embodiment of fire alarm equipment configuring a distributed system in which a relay board is connected to a receiver via a communication line. Explanatory diagram showing conventional notification equipment using a loop transmission line

[Fire alarm equipment]
(Summary of fire alarm equipment)
FIG. 1 is an explanatory diagram showing an overview of fire alarm equipment that monitors fires using a loop transmission line. As shown in FIG. 1, for example, an R-type receiver 10 is installed in a manager's room on the first floor of a building where fire alarm equipment is installed, and a pair of signal lines 14a, For example, two lines of the loop transmission line 12 using 14b are drawn out.

A plurality of fire detectors 16 each having a transmission function and each having a unique address are connected to the loop transmission line 12 . Further, a short circuit disconnection device 18 known as a short circuit isolator is connected to the loop transmission line 12 between the fire detectors 16 and detects a short circuit in the loop transmission line 12 and disconnects it. Like No. 16, a unique address is set and it has a transmission function.

Here, the maximum number of addresses set for a terminal including the fire detector 16 and the short circuit disconnection device 18 connected to the loop transmission line 12 is, for example, 255, and the loop transmission line 12 has a maximum of 254 fire detectors 16. and a terminal including a short-circuit disconnection device 18 can be connected.

In addition, in FIG. 1, in order to make the explanation easier to understand, six fire detectors 16 and five short-circuit disconnection devices 18 are connected, and the addresses of the fire detectors 16 and short-circuit disconnection devices 18 are set to the loop transmission line 12. A1, A2, . . ., A11 from the starting end side.

(Receiver overview)
The receiver 10 is provided with a main CPU 20 and a plurality of sub CPU boards 22-1, 22-2, and the sub CPU boards 22-1, 22-2 are provided with a sub CPU 24 and a transmission section 26. The main CPU 20 and sub CPU 24 are connected by a serial transfer bus 25 and mutually transmit and receive data.

The main CPU 20 is equipped with a display 27 with a touch panel using a liquid crystal display panel or the like, a display section 28 equipped with representative lights for fire, gas leak, and failure, LED indicator lights, etc., and various switches necessary for fire monitoring. An operating section 30, an acoustic alarm section 32 provided with a speaker, and a transmission section 34 are connected. Further, the main CPU 20 is provided with a fire alarm control section 38 as a function realized by executing a program.

The sub CPU 24 provided on the sub CPU boards 22-1 and 22-2 is provided with a transmission control unit 36 as a function realized by executing a program. The transmission control section 36 instructs the transmission section 26 to perform start-up control at the time of start-up of the receiver for sending and receiving signals to and from the loop transmission line 12, and transmission control after start-up.

When the receiver 10 is started up, the transmission control unit 36 of this embodiment performs type read control to collect terminal type information by supplying power to the loop transmission line 12 from the start end side and terminal call control to collect the terminal status. By repeating startup control, the switches of the short-circuit disconnecting devices 18 are turned on in order, the connection order information of the short-circuit disconnecting devices 18 in the loop transmission path 12 is detected, and a node map indicating the connection order of the short-circuit disconnecting devices 18 is generated. control to display on the display 27 .

Furthermore, if a short circuit or disconnection has occurred in the loop transmission line 12, when the receiver 10 is started up, the transmission control unit 36 supplies power to the loop transmission line 12 from the starting end side and performs type reading control. By repeating the starting end side start-up control by the terminal call control, the switches of the short-circuit disconnecting devices 18 are turned on in order, and the starting end side connection order information from the starting end side in the loop transmission line 12 of the short-circuit disconnecting device 18 is detected. A line abnormality is detected because the voltage from the power supply is not applied to the end of the loop transmission line 12 due to a short circuit or disconnection of the transmission line 12, and power is supplied to the loop transmission line 12 from the end side to control type reading and terminal calling. By repeating the termination side start-up control, the termination side connection order information of the short-circuit disconnection device 18 in the loop transmission line 12 is detected, and the connection order of the short-circuit disconnection device 18 and the short circuit are determined based on the start-end side connection order information and the start-side order information. Alternatively, control is performed to generate a node map indicating the disconnection position and display it on the display 27 .

When the transmission control unit 36 completes the start-up control, if the loop transmission line 12 is normal, it monitors for a fire using the start-side transmission control that transmits and receives signals from the start-end side of the loop transmission line.
Furthermore, when a line failure due to a short circuit or disconnection of the loop transmission line 12 is detected during operation, fire is monitored by the termination side transmission control that transmits and receives signals from the termination side of the loop transmission line 12 in addition to the start side transmission control.

Based on the connection order information, the response of the short circuit disconnection device 18 on the start end side, and the response of the short circuit disconnection device 18 on the end side, a node map indicating the connection order of the short circuit disconnection device 18 and the short circuit or disconnection position is generated and displayed on the display 27 . control.

The transmission unit 26 converts the terminal control signal output from the sub-CPU 24, which varies between 0 and 5V, into a voltage control signal (voltage pulse signal) which varies within a predetermined voltage range, for example, a voltage range of 27V to 36V, under the transmission control of the transmission control unit 36. It is converted into a downlink signal and output to the loop transmission line 12 as a downlink signal.

On the other hand, the terminal response signal from the fire detector 16 and the short circuit disconnection device 18 to the receiver 10 causes a signal current to flow through the loop transmission line 12 at the timing of bit 1 of the transmission data, and a current response signal in the form of a so-called current pulse train rises. The signal is received by the receiver 10 as a signal. Therefore, the transmission unit 26 converts the current response signal received from the loop transmission line 12 into a terminal response signal of 0 to 5V and outputs it to the sub CPU 24.

Fire monitoring control by the fire alarm control section 38 of the receiver 10 when the loop transmission line 12 is normal is as follows. During normal monitoring, the transmission control unit 36 of the sub CPU 24 instructs the transmission unit 26 to transmit a broadcast batch AD conversion signal including a batch AD conversion command at regular intervals T. The fire detector 16, which has received this batch AD-converted signal, converts the analog smoke concentration signal output from the smoke detection section into a digital smoke concentration signal by AD conversion, and holds the digital smoke concentration signal as detection data. Subsequently, the transmission control section 36 instructs the transmission section 26 to transmit a paging signal including a polling command that sequentially specifies terminal addresses.

When the fire detector 16 receives a call signal having an address that matches its own address, it transmits a call response signal containing the smoke density data held at that time to the receiver 10.

In addition, the fire detector 16 is set with a smoke density threshold equivalent to type 1 sensitivity, for example, a smoke density threshold of 5.0%/m as a warning display threshold, and the detected smoke density data is equal to or higher than the warning display threshold. When the warning display threshold is exceeded, it is determined that a fire has occurred, and a fire interrupt signal is transmitted to the receiver 10.

When the transmission control unit 36 receives the fire interrupt signal via the transmission unit 26, it transmits a group search command signal to identify the group that includes the fire detector 16 that caused the fire alarm, and then transmits an intra-group search command signal. The address of the fire detector 16 that transmitted the fire alarm is specified, smoke density data is intensively collected, and is transmitted to the main CPU 20 via the serial transfer bus 25.

The fire alarm control unit 38 of the main CPU 20 compares the fire alarm smoke density data received from the sub CPU 24 with a predetermined fire alarm threshold corresponding to type 2 sensitivity, for example, a fire alarm threshold of 10%/m. If the value exceeds the fire alarm threshold or the fire alarm threshold, it is determined that there is a fire and fire alarm control is performed.

The fire alarm control by the fire alarm control unit 38 turns on the fire representative light on the display unit 28, causes the speaker of the acoustic alarm unit 32 to output a predetermined main acoustic alarm indicating the occurrence of a fire, and indicates on the display 27 that a fire has been detected. Fire alarm information including the fire occurrence location is displayed based on the sensor address, and furthermore, the alarm shifting section 34 outputs a fire alarm signal to the outside to perform predetermined alarm shifting control and the like.

[Transmission unit configuration]
FIG. 2 is a block diagram showing details of the transmitter and terminal when the receiver is started up with the loop transmission path in a normal state.

As shown in FIG. 2, a loop transmission line 12 using signal lines 14a and 14b is led out from starting terminals L1 and LC1 provided in the receiver 10, and a terminal end of the loop transmission line 12 is provided in the receiver 10. Fire detectors 16-1 to 16-6 are connected to the loop transmission line 12, and switches 46-1 and 46-1 are connected between the fire detectors 16-1 to 16-6 . Short circuit disconnection devices 18-1 to 18-5 with 46-2 are connected.

A terminal control signal E1 varying at 0 to 5 VDC is output from the transmission control section 36 to the transmission section 26, and a terminal response signal E2 varying at 0 to 5 VDC is outputted from the transmission section 26 to the transmission control section 36. Ru. The transmission output side of the transmission section 26 is connected to start terminals L1 and LC1.

Further, the transmission output side of the transmission section 26 is connected to termination terminals L2 and LC2 via termination switches 42-1 and 42-2. The termination switches 42-1 and 42-2 are semiconductor switches such as FETs, and are turned on and off in conjunction with a control signal E4 from the transmission control unit 36, and are normally off. A termination voltage detection section 40 is provided between the termination terminals L 2 and LC 2 of the loop transmission line 12, detects the termination voltage VS2, and outputs a termination voltage detection signal E3 to the transmission control section 36.

The transmission control unit 36 instructs the transmission unit 26 to output a terminal control signal E1, which is a downlink signal, to the starting end of the loop transmission path 12, and also outputs a terminal response, which is an uplink signal, received from the starting end of the loop transmission path 12. Performs transmission control on the starting end side that receives signal E2.

If the termination voltage VS2 is not obtained even after a predetermined period of time has elapsed since the power supply to the start end side, the transmission control unit 36 detects a line failure due to a short circuit or disconnection, and when a line failure is detected, the termination switch 42- is activated by a control signal E4. 1 and 42-2 to perform terminal side transmission control in which the terminal control signal E1 from the transmission section 26 is also output to the terminal end of the loop transmission line 12.

FIG. 3 is a time chart showing the terminal control signal and the terminal response signal transmitted and received by the transmission section, with FIG. 3(A) showing the terminal control signal E1 and FIG. 3(B) showing the terminal response signal E2.

The terminal control signal E1 is a broadcast batch AD conversion signal, followed by a terminal control signal that sequentially specifies the terminal addresses A1 to A11, and is repeated every transmission cycle T. Numbers 1 to 11 in FIG. 3(A) indicate addresses A1 to A11 set in order from the start end to the fire detectors 16-1 to 16-6 and the short-circuit disconnection devices 18-1 to 18-5. The subsequent addresses up to A254 are unused in the case of FIG.

The terminal response signal E2 is received by being transmitted from the fire detectors 16-1 to 16-6 or the short-circuit disconnection devices 18-1 to 18-5 at the timing of the idle time of the terminal control signal E1.

Here, the terminal control signals transmitted by the transmission unit 26 of this embodiment include a type reading signal and a calling signal, and in response to these, a type response signal in which a type code is set and a terminal detection state are set from the terminal side. There is a called answer signal.

[Short circuit disconnection device]
FIG. 4 is a circuit block diagram showing an embodiment of a short circuit disconnection device provided in a loop transmission line. As shown in FIG. 4, the short circuit disconnection device 18 includes a transmission section 50, a control section 48, a voltage detection section 52, switches 46-1 and 46-2, a current limiting resistor 54, a current limiting release switch 56, and a diode 58-1. , 58-2, 60-1, and 60-2, and operates by receiving power supply from the signal lines 14a and 14b or from a dedicated power supply line.

The voltage detection section 52 detects the line voltage between the signal lines 14a and 14b and outputs it to the control section 48. When a short circuit occurs between the signal lines 14a and 14b on the terminal side of the loop transmission line 12, the voltage detected by the voltage detection section 52 decreases to a voltage near approximately 0V corresponding to the short circuit impedance.

When the control unit 48 receives a type read signal (activation call signal) that matches the self-address transmitted in the startup control of the receiver 10 via the transmission unit 50, it instructs the transmission unit 50 to activate the short-circuit disconnection device. A type response signal (activation response signal) in which a predetermined type code shown in FIG.

When the switches 46-1 and 46-2 are turned on, inrush current flows to charge the fire detector 16 and short-circuit disconnection device 18 connected to the loop transmission line 12 on the secondary side, but the rush current flows through the current limiting resistor 54. By flowing, the inrush current is limited to a current below a level that is detected as an overcurrent by the receiver 12.

When the control section 48 determines that a predetermined current limit time has elapsed since the switches 46-1 and 46-2 are turned on, the control section 48 turns on the current limit release switch 56, bypasses the current limit resistor 54, and cancels the current limit.

In addition, when the control unit 48 receives a calling signal that matches the self-address transmitted by the start-up control and transmission control of the receiver 10 via the transmission unit 50, the control unit 48 detects and maintains the normal state upon reception of the batch AD conversion signal. Alternatively, the transmission section 50 is instructed to transmit a paging response signal in which a state (status) such as short circuit is set.

Transmission and reception of the terminal control signal from the receiver 10 is normally performed from the starting end of the loop transmission line, and in the event of a short circuit or disconnection, it is performed from the terminating side. , 60-2 enable the transmission section 50 to handle signal transmission and reception on the starting end side and the terminating end side.

That is, an input/output circuit passing through the diode 58-1, the transmission section 50, and the diode 58-2 is used for signal transmission and reception from the start end side, and a diode 60-1, the transmission section 50, and the diode 60-2 are used for signal transmission and reception from the termination side. Two input/output circuits are used.

In addition, when the control unit 48 determines that the voltage detected by the voltage detection signal from the voltage detection unit 52 has decreased to a predetermined short-circuit threshold voltage or less, the control unit 48 generates a paging response signal when a paging signal specifying the self address is received. A short-circuit state is set to the transmitter 50 and transmitted to the receiver 10. Thereby, the receiver 10 detects a line fault in the loop transmission line 12 and turns on the termination switches 42-1 and 42-2. , performs terminal side transmission control in which terminal control signals are also transmitted from the terminal side of the loop transmission path 12.

Next, startup control for generating and displaying a node map when the receiver is started up by the transmission control section 36 and transmission section 26 in FIG. 2 will be described.

[Startup control when transmission path is normal]
In FIG. 2, when the receiver 10 is powered on, the transmission control section 36 instructs the transmission section 26 to perform start-side transmission control.

The start end side transmission control includes, after supplying power between the start end terminals L1 and LC1 of the loop transmission line 12 from the transmission unit 26, transmitting a type read signal that functions as a switch-on signal and receiving a type response signal from the short circuit disconnection device. Then, the connection order information of the short-circuit disconnection devices 18-1 to 18-5 from the start end of the loop transmission path 12 is detected by performing control to repeat the transmission of the call signal and the reception of the call response signal from the short-circuit disconnection device.

The details of the transmission control on the starting end side are as follows. When power is supplied from the transmission unit 26 to the loop transmission line 12 via the start end terminals L1 and LC1, a power supply voltage of, for example, 15 V or more is supplied to the first short-circuit disconnection device 18-1 seen from the start end of the receiver 10. Although it is in an operating state, the switches 46-1 and 46-2 are turned off. Note that power is also supplied to the fire detector 16-1 connected up to the short-circuit disconnection device 18-1, and the fire detector 16-1 becomes operational.

Next, the transmission control unit 36 instructs the transmission unit 26 to send a type read command that sequentially specifies terminal addresses A1 to A11 to A254 following the batch AD conversion signal, as shown in FIG. 3(A). The set type read signal is transmitted, and the first short-circuit disconnection device 18-1 receives the type read signal that matches its own address. After transmitting a type response signal in which a predetermined type code indicating a short-circuit disconnection device is set, switches 46-1 and 46-2 are turned on to supply power to the second short-circuit disconnection device 18-2. At this time, since no short circuit has occurred in the loop transmission line 12, the line voltage does not fall below the short circuit threshold voltage, and the short circuit disconnection device 18-1 detects the normal state of the loop transmission line.

When the transmission control unit 36 of the receiver 10 receives the type response signal from the first short-circuit disconnection device 18-1 via the transmission unit 26, the transmission control unit 36 determines that the short-circuit disconnection device 18-1 is connected first. The connection order information (SCI18-1) shown is detected.

Next, the transmission control unit 36 instructs the transmission unit 26 to set a call command that sequentially specifies terminal addresses A1 to A11 to A254 following the batch AD conversion signal, as shown in FIG. 3(A). sends the called signal.

When the first short-circuit disconnection device 18-1 receives a calling signal matching its own address, it transmits a calling response signal indicating the normal state detected by receiving the batch AD conversion signal. When the transmission control unit 36 of the receiver 10 receives the call response signal from the first short-circuit disconnection device 18-1 via the transmission unit 26, the short-circuit disconnection device 18-1 returns to the normal state without disconnecting the short circuit. to detect that

Thereafter, in the same manner, power is supplied to the short-circuit disconnection devices 18-2, 18-3, 18-4, and 18-5 in this order, and a type response signal is transmitted by receiving the type read signal, and the switches 46-1 and 46-2 are is turned on, and transmission of a calling response signal indicating a normal state in response to a calling signal is repeated, and the transmission control unit 36 of the receiver 10 detects the type from the short circuit disconnection devices 18-2, 18-3, 18-4, and 18-5. Based on the reception of the response signal, the short-circuit disconnection device 18-2 is connected second, the short-circuit disconnection device 18-3 is connected third, the short-circuit disconnection device 18-4 is connected fourth, and the short-circuit disconnection device 18 -5 is the fifth connection order (SCI18-1, SCI18-2, SCI18-3, SCI18-4, SCI18-5) is detected.

When the switches 46-1 and 46-2 of the short-circuit disconnection device 18-5 are turned on, the termination voltage detector 40 detects the termination voltage VS2 of 15V or more, and the transmission control unit 36 determines whether the loop transmission line 12 is normal. Detect something.

Next, the transmission control unit 36 determines the connection order of the short-circuit disconnection devices 18-1 to 18-5 based on the detected connection order information (SCI18-1, SCI18-2, SCI18-3, SCI18-4, SCI18-5). A node map indicating the node map is created, and the main CPU 20 shown in FIG. 1 is notified to display the node map on the display 27.

FIG. 5 is an explanatory diagram showing a node map displayed when the loop transmission path is normal. As shown in FIG. 5, on the node map screen 62 of the display, short circuit disconnection device symbols 18-1a to 18-5a connected by block arrows from the receiver symbol 10a are shown in the connection order detected by the receiver startup control. The information is displayed based on the information (SCI18-1, SCI18-2, SC(18-3, SCI18-4, SCI18-5)), and "line normal" is displayed as the line status 63.

By viewing such a node map screen 62, a supervisor or the like can easily and accurately grasp in what order the short-circuit disconnection devices 18-1 to 18-5 in the loop transmission line 12 are connected. Can be done.

[At the time of transmission line short circuit]
(When a short circuit occurs)
Figure 6 is a block diagram showing details of the transmitter and terminal of the receiver when there is a short circuit in the loop transmission line, and Figure 7 is an explanatory diagram showing the node map displayed when there is a short circuit in the loop transmission line. be.

The transmission control unit 36 performs control to repeatedly send a calling signal to each device and receive a response signal between the terminal side of the loop transmission line 12 and the terminal side of the loop transmission line 12 whose voltage is higher than or above a predetermined voltage. If the voltage VS2 is not detected, it is determined that the line failure is due to a short circuit in the loop transmission line 12, and the termination switches 42-1 and 42-2 are turned on to connect the transmission output side of the transmission section 26 to the termination terminals L2 and LC2. and supply power to the loop transmission line 12 from the terminal side.

In addition, the connection order on the start end side from the start end side of the loop transmission line 12 to the short circuit disconnection device that has transmitted the short circuit disconnection operation signal based on the call response signal (short circuit disconnection operation signal) indicating the short circuit state and the connection order information during normal operation. Discover information. In addition, the connection order on the termination side from the termination side of the loop transmission line 12 to the short-circuit disconnection device that has transmitted the short-circuit disconnection operation signal based on the call response signal (short-circuit disconnection operation signal) indicating the short-circuit state and the connection order information during normal operation. Discover information.

A detailed explanation is as follows. As shown in FIG. 6, it is assumed that a short circuit 64 occurs between the short circuit disconnection device 18-3 and the short circuit disconnection device 18-4 connected to the loop transmission line 12.

A short circuit current flows due to the short circuit 64, and the line voltage of the short circuit disconnection device 18-3 greatly decreases to below a predetermined short circuit threshold voltage, whereby a short circuit is detected and the switches 46-1 and 46-2 are turned off. At the same time, a call response signal (short-circuit disconnection operation signal) indicating the short-circuit condition is transmitted to the receiver 10.

The transmission control unit 36 of the receiver 10 receives the call response signal from the short-circuit disconnection device 18-3 and detects a short circuit state, and furthermore, after a predetermined time, the termination voltage detection unit 40 detects that the termination voltage VS2 exceeds a predetermined voltage. Since it is not detected, a line abnormality due to a short circuit in the loop transmission line 12 is detected.

From the first short-circuit disconnection device 18-1, which is the starting end side connection order information up to the short-circuit disconnection device that transmitted the short-circuit disconnection operation signal based on the connection order information during normal operation, to the third short-circuit disconnection device 18 that detected the short circuit. The starting end side connection order information (SCI18-1, SCI18-2, SCI18-3) up to -3 has been detected.

Subsequently, the transmission control unit 36 that detected the line abnormality starts termination side control and supplies power between the termination terminals L2 and LC2 of the loop transmission line 12 by turning on the termination switches 42-1 and 42-2. As a result, power is supplied to the first short-circuit disconnection device 18-5 from the termination side, and the short-circuit disconnection device 18-5 is brought into operation.

The short-circuit disconnection device 18-5 that is in the operating state receives the type reading signal and transmits the type response signal, and then turns on the switches 46-1 and 46-2 to turn on the power to the next short-circuit disconnection device 18-4. The short-circuit disconnecting device 18-5 then receives the ringing signal and transmits a ringing response signal indicating the normal state.

When the short-circuit disconnection device 18-4 that is in the operating state receives the type reading signal and turns on the switches 46-1 and 46-2, a short-circuit current flows due to the short circuit 64, and the line voltage of the short-circuit disconnection device 18-4 is reduced. A short circuit is detected when the voltage significantly decreases to below a predetermined short circuit threshold voltage, and the switch 46 is turned off to disconnect the side where the short circuit 64 has occurred, and a call response signal (short circuit disconnection operation signal) indicating the short circuit state is generated. It is transmitted to the receiver 10.

Through such termination-side start-up control, the transmission control unit 36 performs control from the termination of the loop transmission line 12 to the first short-circuit disconnection device 18-5 from the termination and the second short-circuit disconnection device 18-4 that has detected the short-circuit state. The terminal side connection order information (SCI18-5, SCI18-4) indicating the connection order of the terminals is detected.

Alternatively, without performing the termination-side control as described above, a simultaneous activation signal is sent to the short-circuit disconnection devices on the termination side multiple times to activate all the short-circuit disconnection devices on the termination side, and the short-circuit disconnection device closest to the short circuit is activated. The receiver 10 may be caused to transmit a paging response signal (short-circuit disconnection operation signal) indicating the short-circuit state. In this case, the termination side connection order information up to the short-circuit disconnection device that transmitted the short-circuit disconnection operation signal is detected based on the connection order information during normal operation.

Next, the transmission control unit 36 compares the detected start-side connection order information (SCI18-1, SCI18-2, SCI18-3) with the detected end-side connection order information (SCI18-5, SCI18-4), and It is determined that the short-circuit disconnecting devices 18-3 and 18-4 are adjacent from the last connection order, and the position between them is detected as the occurrence position of the short-circuit 64.

Here, since the terminal addresses of the short-circuit disconnection devices 18-3 and 18-4 are A6 and A8 and the type codes are the same, there is no terminal address with the same type code between them, so that the short-circuit disconnection device 18 -3 and 18-4 are adjacent to each other, and it can be detected that the short circuit 64 occurs between them.

The transmission control unit 36 creates the node map shown in FIG. 7 based on the detected starting side connection order information (SCI18-1, SCI18-2, SCI18-3) and terminating side connection order information (SCI18-5, SCI18-4). A screen 62 is displayed on the display.

In the node map screen 62 of FIG. 7, the short-circuit disconnection device symbols 18-1a to 18-3a are blocked based on the start-side connection order information (SCI18-1, SCI18-2, SCI18-3) from the start end side of the receiver symbol 10a. The short-circuit disconnection device symbols 18-5a and 18-4a are connected by block arrows based on the terminal side connection order information (SCI18-5, SCI18-4) from the terminal side of the receiver symbol 10a. A short circuit symbol 64a is displayed between the short circuit disconnecting devices 18-3 and 18-4. In addition, “Line failure short circuit” is displayed on the screen as the line status 63.

By viewing the node map screen 62 as shown in FIG. 7, a supervisor or the like can see that a line abnormality has occurred in the loop transmission line 12 due to a short circuit, and the location of the short circuit can be displayed. By checking this, you can proceed with the repair work efficiently.

Further, when the roadmap shown in the roadmap screen 62 in FIG. 5 is generated by the receiver start-up control with the loop transmission line 12 in a normal state, a short circuit occurs in the loop transmission line 12 during operation. When the termination side transmission control is added to the start side transmission control, the node map screen 62 shown in FIG. 7 is displayed, and it is possible to easily and reliably check the short circuit location and proceed with the repair work efficiently.

(When a short circuit occurs in two places)
Figure 8 is a block diagram showing the details of the transmission unit and terminal when there is a short circuit in two places on the loop transmission line, and Figure 9 shows the node map displayed when there is a short circuit on two places on the loop transmission line. It is an explanatory diagram.

As shown in FIG. 8, short circuits 64-1 and 64-2 occur at two locations in the loop transmission line 12, between the short-circuit disconnection devices 18-2 and 18-3 and between the short-circuit disconnection devices 18-3 and 18-4. Suppose that occurs.

A short circuit is detected when the line voltage of the short circuit disconnection device 18-2 decreases significantly and becomes below a predetermined short circuit threshold voltage, and the switches 46-1 and 46-2 are turned off and the short circuit 64-1 occurs. At the same time, a paging response signal in which a short-circuit state is set is transmitted to the receiver 10.

The transmission control unit 36 of the receiver 10 receives the call response signal from the short-circuit disconnection device 18-2, detects the short circuit state, and further detects the termination voltage VS2 exceeding the predetermined voltage by the termination voltage detection unit 40 after a predetermined time. Since it is not detected, a line abnormality of the loop transmission line 12 is detected, and the starting end side connection order information (SCI18-1, SCI18-2) is also detected.

Next, the transmission control unit 36 starts the termination side control and turns on the termination switches 42-1 and 42-2 to supply power between the termination terminals L2 and LC2 of the loop transmission line 12, thereby Power is supplied to the first short-circuit disconnection device 18-5 from the termination side to bring it into operation.

The short-circuit disconnection device 18-5 that is in the operating state receives the type reading signal and transmits the type response signal, and then turns on the switches 46-1 and 46-2 to turn on the power to the next short-circuit disconnection device 18-4. The short-circuit disconnecting device 18-5 then receives the ringing signal and transmits a ringing response signal indicating the normal state.

When the short-circuit disconnection device 18-4 that is in the operating state receives the type reading signal and turns on the switches 46-1 and 46-2, a short-circuit current flows due to the short circuit 64-2, and the wire of the short-circuit disconnection device 18-4 is turned on. A short circuit is detected when the voltage between the terminals 64-2 and 64-2 decreases significantly and becomes below a predetermined short-circuit threshold voltage, and the switches 46-1 and 46-2 are turned off to disconnect the side where the short circuit 64-2 has occurred and set the short-circuit state. The received paging response signal is transmitted to the receiver 10.

The transmission control unit 36 generates termination-side connection order information (SCI 18-) indicating the connection order from the short-circuit disconnection device 18-5 on the termination side of the loop transmission line 12 to the short-circuit disconnection device 18-4 that detected the short-circuit state by the termination-side control . 5, SCI18-4) is detected. Further, the transmission control unit 36 detects disconnection information (SC I 18-3) indicating that the short circuit disconnection device 18-3 is disconnected from the loop transmission path 12 by the short circuit disconnection devices 18-2 and 18-4. do.

Alternatively, without performing the termination-side control as described above, a simultaneous activation signal is sent to the short-circuit disconnection devices on the termination side multiple times to activate all the short-circuit disconnection devices on the termination side, and the short-circuit disconnection device closest to the short circuit is activated. A call response signal (short-circuit disconnection operation signal) indicating the short-circuit state may be transmitted from the terminal. Thereby, the termination side connection order information (SCI18-5, SCI18-4) is detected. Further, the transmission control unit 36 detects disconnection information (SC I 18-3) indicating that the short circuit disconnection device 18-3 is disconnected from the loop transmission path 12 by the short circuit disconnection devices 18-2 and 18-4. do.

Next, the transmission control unit 36 compares the start-side connection order information (SCI18-1, SCI18-2 ) and the end-side connection order information (SCI18-5, SCI18-4), and selects adjacent terminals from the terminal address of both. Since the short-circuit disconnection devices 18-2 and 18-4 are not connected, and the short-circuit disconnection device 18-3 based on the disconnection information (SCI18-3) is located between them, the short-circuit disconnection devices 18-2 and 18-3 are A short circuit 64-1, 64-2 is detected between the short circuit disconnection devices 18-4 and 18-3.

Next, based on the start-side connection order information (SCI18-1, SCI18-2), the end-side connection order information (SCI18-5, SCI18-4), and the disconnection information (SCI18-3), the node map screen shown in FIG. 9 is created. 62 is displayed on the display.

In the node map screen 62 of FIG. 9, short-circuit disconnection device symbols 18-1a and 18-2a are connected by block arrows based on the start-side connection order information (SCI18-1, SCI18-2) from the start end side of the receiver symbol 10a. Based on the terminal side connection order information (SCI18-5, SCI18-4) from the terminal side of the receiver symbol 10a, short circuit disconnection device symbols 18-5a and 18-4a are displayed connected by block arrows, and disconnection is performed. Based on the information (SCI18-3), the short-circuit disconnector symbol 18-3a is displayed in isolation, and furthermore, the short-circuit disconnector symbol 18-2a and 18-3a and between the short-circuit disconnector symbol 18-4a and 18- 3a, short circuit symbols 64-1a and 64-2a are displayed. In addition, “Line failure short circuit” is displayed on the screen as the line status 63.

By viewing the node map screen 62 as shown in FIG. 9, a supervisor or the like can see that a line abnormality has occurred in the loop transmission line 12 due to a short circuit, and also display the positions where two short circuits have occurred. By checking this, you can proceed with the repair work efficiently.

[Control when transmission line is disconnected]
(When disconnection occurs)
FIG. 10 is a block diagram showing details of a transmission unit and a terminal when there is a break in the loop transmission path, and FIG. 11 is an explanatory diagram showing a node map displayed when there is a break in the loop transmission path. If the termination voltage VS2 of the loop transmission line 12 that is equal to or higher than the predetermined voltage is not detected, the transmission control unit 36 detects that the call response signal (short-circuit disconnection operation signal) indicating the short-circuit state has not been received. , it is determined that the line failure is due to a break in the loop transmission line 12, and control is performed on the termination side.

The transmission control unit 36 performs control to repeatedly transmit a paging signal and receive a paging response signal between the starting end side of the loop transmission path 12 and disconnect the short circuit when the paging response signal is transmitted from the starting end side of the loop transmission path 12. The device group is identified, and the start end side connection order information is detected based on the connection order information during normal operation.

Termination side control by the transmission control unit 36 is performed by turning on the termination switches 42-1 and 42-2, connecting the transmission output side of the transmission unit 26 to the termination terminals L2 and LC2, and supplying power to the loop transmission line 12 from the termination side. supply Subsequently, the transmission control unit 36 performs control to repeat transmission of the paging signal and reception of the paging response signal with the terminal side of the loop transmission path 12, and transmits the paging response signal from the terminal side of the loop transmission path 12. The short-circuit disconnection device group is identified, and the termination side connection order information is detected based on the connection order information during normal operation.

A detailed explanation is as follows. As shown in FIG. 10, it is assumed that a disconnection 66 occurs between the short-circuit disconnection device 18-3 and the short-circuit disconnection device 18-4 connected to the loop transmission line 12.

The transmission control unit 36 of the receiver 10 detects a line abnormality in the loop transmission line 12 because the termination voltage detection unit 40 does not detect a termination voltage VS2 exceeding a predetermined voltage after a predetermined period of time, and also detects a short-circuit condition by the call response signal. Since this is not detected, a line abnormality due to a disconnection is detected. Furthermore, control is performed to repeat the transmission of the paging signal and the reception of the paging response signal, and connection order information (SCI18-1, SCI18 -2, SCI18-3) is detected as the starting end side connection order information.

Next, the transmission control unit 36 starts the termination side control and turns on the termination switches 42-1 and 42-2, thereby supplying power between the termination terminals L2 and LC2 of the loop transmission line 12. Power is supplied to the first short-circuit disconnection device 18-5 from the side to bring it into operation.

The short-circuit disconnection device 18-5 that is in the operating state receives the type reading signal and transmits the type response signal, and then turns on the switches 46-1 and 46-2 to turn on the power to the next short-circuit disconnection device 18-4. The short-circuit disconnecting device 18-5 then receives the ringing signal and transmits a ringing response signal indicating the normal state.

Similarly, the short-circuit disconnection device 18-4 that is in the operating state turns on the switches 46-1 and 46-2 after receiving the type reading signal and transmitting the type response signal, and then switches on the next short-circuit disconnection device 18-4. The short-circuit disconnecting device 18-5 then receives a calling signal and transmits a calling response signal indicating a normal state. By the termination side control of the transmission control unit 36, termination side connection order information (SCI18-5, SCI18 -4) is detected.

Alternatively, without performing the termination side control as described above, a simultaneous activation signal is sent multiple times to the termination side short-circuit disconnection devices to activate all the termination side short-circuit disconnection devices, and to send the call signal and respond to the call. Even if the signal reception is repeatedly controlled and the termination side connection order information up to the short circuit disconnection device closest to the disconnection is detected based on the short circuit disconnection device group information that sent the call response signal and the connection order information during normal operation. good.

Next, the transmission control unit 36 compares the starting side connection order information (SCI18-1, SCI18-2, SCI18-3) and the terminating side connection order information (SCI18-5, SCI18-4), and determines the last number of both. It is determined that these are the adjacent short-circuit disconnection devices 18-3 and 18-4, and the area between them is detected as the location where the disconnection 64 occurs.

Next, the transmission control unit 36 performs the process shown in FIG. The node map screen 62 shown is displayed on the display.

In the node map screen 62 of FIG. 11, the short-circuit disconnection device symbols 18-1a to 18-3a are blocked based on the connection order information (SCI18-1, SCI18-2, SCI18-3) from the start side of the receiver symbol 10a. The short-circuit disconnection device symbols 18-5a and 18-4a are connected by block arrows based on the terminal side connection order information (SCI18-5, SCI18-4) from the terminal side of the receiver symbol 10a. A disconnection symbol 66a is displayed between the short-circuit disconnection devices 18-3 and 18-4. In addition, "Line failure/disconnection" is displayed as the track status 63 on the screen.

By viewing the node map screen 62 as shown in FIG. 11, a supervisor or the like can find out that a line abnormality due to a disconnection has occurred in the loop transmission line 12, and the location of the disconnection can be displayed. By checking this, you can proceed with the repair work efficiently.

Further, when the roadmap shown in the roadmap screen 62 in FIG. 5 is generated by the receiver start-up control with the loop transmission line 12 in a normal state, a disconnection occurs in the loop transmission line 12 during operation. When the termination side transmission control is added to the start side transmission control, a node map screen 62 shown in FIG. 11 is displayed, and it is possible to easily and reliably check the disconnection location and proceed with the repair work efficiently.

(When disconnection occurs in two places)
Figure 12 is a block diagram showing details of the transmission unit and terminal when there is a disconnection in two places on the loop transmission line, and Figure 13 shows a node map displayed when there is a disconnection in two places on the loop transmission line. It is an explanatory diagram.

As shown in FIG. 12, the wires 66-1 and 66-2 are disconnected at two places in the loop transmission line 12, between the short-circuit disconnection devices 18-2 and 18-3 and between the short-circuit disconnection devices 18-3 and 18-4. Suppose that occurs.

The transmission control unit 36 of the receiver 10 detects a line abnormality in the loop transmission line 12 because the termination voltage detection unit 40 does not detect a termination voltage VS2 exceeding a predetermined voltage after a predetermined period of time, and also detects a short-circuit condition by the call response signal. Since this is not detected, a line abnormality due to a disconnection is detected.

The transmission control unit 36 also provides start-side connection order information (SCI 18 -1, SCI18-2, SCI18-3).

Subsequently, the transmission control unit 36 that detected the line abnormality starts termination side control and supplies power between the termination terminals L2 and LC2 of the loop transmission line 12 by turning on the termination switches 42-1 and 42-2. As a result, power is supplied to the first short-circuit disconnection device 18-5 from the termination side, and the short-circuit disconnection device 18-5 is brought into operation.

The short-circuit disconnection device 18-5 that is in the operating state receives the type reading signal and transmits the type response signal, and then turns on the switches 46-1 and 46-2 to turn on the power to the next short-circuit disconnection device 18-4. The short-circuit disconnecting device 18-5 then receives the ringing signal and transmits a ringing response signal indicating the normal state.

The transmission control unit 36 generates terminal side connection order information (SCI18- 5, SCI18-4) is detected. Furthermore, the transmission control unit 36 detects isolated information (SCI18-3) indicating the short-circuit disconnection device 18-3 from which the type response signal and the call response signal are not received due to a disconnection.

Alternatively, without performing the termination side control as described above, a simultaneous activation signal is sent multiple times to the termination side short-circuit disconnection devices to activate all the termination side short-circuit disconnection devices, and to send the call signal and respond to the call. Control is performed to repeat signal reception, and terminal side connection order information (SCI18-5, SCI18-5, SCI18-4) may also be detected. Furthermore, the transmission control unit 36 detects isolated information (SCI18-3) indicating the short-circuit disconnection device 18-3 from which the type response signal and the call response signal are not received due to a disconnection.

Next, the transmission control unit 36 compares the start-side connection order information (SCI18-1, SCI18-2) and the end-side connection order information (SCI18-5, SCI18-4), and selects adjacent terminals from the terminal address of both. It is determined that the short circuit disconnecting devices 18-2 and 18-4 are not connected, and the short circuit disconnecting devices 18-2 and 18-3 and between the short circuit disconnecting devices 18-3 and 18-3 are determined based on the isolation information (SCI18-3). It is detected that wire breaks 66-1 and 66-2 have occurred at two locations between 4 and 4.

Next, the transmission control unit 36 performs the following based on the detected starting side connection order information (SCI18-1, SCI18-2), terminating side connection order information (SCI18-5, SCI18-4), and isolation information (SCI18-3). , a node map screen 62 shown in FIG. 13 is displayed on the display.

The node map screen 62 in FIG. 13 shows that short-circuit disconnection device symbols 18-1a and 18-2a are connected by block arrows based on the start-side connection order information (SCI18-1, SCI18-2) from the start end side of the receiver symbol 10a. Based on the terminal side connection order information (SCI18-5, SCI18-4) of the receiver symbol 10a, short-circuit disconnection device symbols 18-5a and 18-4a are displayed connected by block arrows, and isolated Based on the information (SCI18-3), the short-circuit disconnector symbol 18-3a is displayed in isolation, and furthermore, the short-circuit disconnector symbol 18-3a is displayed between the short-circuit disconnector symbol 18-2a and 18-3a, and between the short-circuit disconnector symbol 18-4a and 18-3a. In between, disconnection symbols 66-1a and 66-2a are displayed. In addition, "Line failure/disconnection" is displayed as the track status 63 on the screen.

By viewing the node map screen 62 as shown in FIG. 13, a supervisor or the like can see that a line abnormality due to a disconnection has occurred in the loop transmission line 12, and also display the two locations where the disconnection has occurred. By checking this, you can proceed with the repair work efficiently.

[Receiver startup control]
FIG. 16 is a flowchart showing receiver start-up control, which is a control operation by the transmission control section 36.

(When the transmission path is normal)
As shown in FIG. 14 , when the receiver 10 starts up due to a power-on operation or the like, the transmission control unit 36 instructs the transmission unit 26 in step S1 to supply power to the loop transmission line 12 from the start terminals L1 and LC1, Assuming that the loop transmission line 12 is normal, as shown in FIG. is off.

Subsequently, in step S2, the transmission control section 36 instructs the transmission section 26 to perform type reading control. The type read control in step S2 transmits type read signals in which terminal addresses are sequentially set, and receives type response signals at idle timings of the type read signals. The first short-circuit disconnection device 18-1 that has received the type reading signal from the receiver 10 transmits a type response signal to the receiver 10, turns on the switches 46-1 and 46-2, and the second short-circuit disconnection device 18 Power is supplied to the loop transmission line 12 between the At this time, since the loop transmission line 12 is normal, the short-circuit disconnection device 18-1 transmits a type response signal.

The transmission control unit 36 receives the type response signal from the short-circuit disconnection device 18-1 via the transmission unit 26, and the terminal detects connection order information (SCI18-1) in which the short-circuit disconnection device 18-1 is the first. do.

Next, in step S3, the transmission control section 36 instructs the transmission section 26 to perform terminal call control. In the call control in step S3, a call signal in which terminal addresses are sequentially set is transmitted, and a call response signal is received at an idle timing of the call signal. The first short-circuit disconnection device 18-1 that has received the call signal from the receiver 10 detects a normal state if the line voltage after turning on the switches 46-1 and 46-2 does not fall below a predetermined short-circuit threshold voltage. Then, a call response signal indicating the normal state is transmitted to the receiver 10.

Subsequently, the transmission control unit 36 proceeds to step S4, and repeats the processing of steps S2 and S3 until a predetermined waiting time has elapsed. The processing in steps S2 and S3 is a start-up control that repeats transmission of a type read signal, reception of a type response signal, and transmission of a calling signal and reception of a type response signal. 18-1, the short circuit disconnection devices 18-2 to 18-5 operate in sequence to turn on the switches 46-1 and 46-2 to form the loop transmission path 12, and the final short circuit is removed. When the switches 46-1 and 46-2 of the disconnection device 18-5 are turned on, the power supply voltage is applied to the end of the loop transmission line 12.

Further, by the start-end start-up control that repeats steps S2 and S3, the transmission control unit 36 in step S2 provides start-end connection order information indicating the connection order of the short-circuit disconnection devices 18-1 to 18-5 from the start end of the loop transmission line 12. Detect.

When the transmission control section 36 determines in step S4 that the predetermined waiting time has elapsed, the process proceeds to step S5, and when it determines that the termination voltage VS2 of the loop transmission line 12 detected by the termination voltage detection section 40 is equal to or higher than the predetermined voltage. It is determined that the loop transmission line 12 is normal, and the process proceeds to step S14. Based on the starting end side connection order information detected in step S2, a node map of line normality is generated, and in step S15, for example, the road map shown in FIG. 5 is displayed. to be displayed.

(When transmission line is short-circuited)
If a short circuit has occurred in the loop transmission line 12, the terminal control unit 36 sends a call response signal (short-circuit disconnection operation signal) indicating the short-circuit state during the start-up control of the starting end side, which repeats the processing of steps S2 and S3. Therefore, starting end side connection order information indicating the connection order to the short-circuit disconnection device that has received the call response signal (short-circuit disconnection operation signal) indicating the short-circuit state is detected.

Furthermore, even if the transmission control unit 36 determines that the predetermined waiting time has elapsed in step S4 during the start end startup control and proceeds to step S5, the transmission control unit 36 performs a disconnection operation (switch-off operation) of the short-circuit disconnection device corresponding to the short circuit to terminate the termination. If it is determined that the voltage VS2 is not detected below the predetermined voltage, the process proceeds to step S6, and it is determined that the line failure is due to a short circuit.

The transmission control unit 36 that has determined that there is a line failure in step S6 turns on the termination switches 42-1 and 42-2 in step S7 to supply power between the termination terminals L2 and LC2 of the loop transmission line 12, and then proceeds to step S8. The termination start-up control based on the type reading control and the terminal call control in step S9 is repeated until a predetermined waiting time has elapsed in step S10.

The type reading control in step S8 by the transmission control unit 36 involves transmitting the type reading signal and receiving the type response signal from the end of the loop transmission path 12, and connecting the short-circuit disconnecting devices 18-5, 18 from the end of the loop transmission 12. Detect terminal side connection order information indicating a connection order of −4.

In the terminal paging control in step S9 by the transmission control unit 36, the paging signal is transmitted and the paging response signal is received from the end of the loop transmission path 12, and the normality or short-circuit state of the short-circuit disconnection device is detected from the paging response signal.

When the transmission control unit 36 determines in step S10 that the predetermined waiting time has elapsed, the process proceeds to step S11, and in step S9, since a paging response signal (short-circuit disconnection operation signal) indicating a short-circuit state has been received, it determines that there is a short-circuit response. After the determination, the process proceeds to step S12, where a node map of the short-circuit disconnection devices 18-1 to 18-5 due to short-circuit faults is generated based on the start-side connection order information detected in step S2 and the termination-side connection order information detected in step S8. Then, the process proceeds to step S15, where a node map including the short circuit positions shown in FIG. 7, for example, is displayed on the display.

(When transmission line is disconnected)
If a disconnection has occurred in the loop transmission line 12, the transmission control unit 36 has received a call response signal indicating a normal state during the starting end side start-up control that repeats the processing of steps S2 and S3. Start end side connection order information indicating the connection order to the short-circuit disconnection device that transmitted the call response signal indicating the normal state is detected.

Further, even if the transmission control unit 36 determines that the predetermined waiting time has elapsed in step S4 during the start end startup control and proceeds to step S5, if it determines that the termination voltage VS2 is not detected below the predetermined voltage due to a disconnection, the transmission control unit 36 performs step S4. Proceeding to S6, since no short-circuit condition has been detected, it is determined that the line failure is due to a disconnection.

The transmission control unit 36 that has determined that there is a line failure in step S6 turns on the termination switches 42-1 and 42-2 in step S7 to supply power between the termination terminals L2 and LC2 of the loop transmission line 12, and then proceeds to step S8. The termination start-up control based on the type reading control and the terminal call control in step S9 is repeated until a predetermined waiting time has elapsed in step S10.

The type reading control in step S8 by the transmission control unit 36 involves transmitting the type reading signal and receiving the type response signal from the end of the loop transmission path 12, and connecting the short-circuit disconnecting devices 18-5, 18 from the end of the loop transmission 12. Detect terminal side connection order information indicating a connection order of −4.

In the terminal paging control in step S9 by the transmission control unit 36, the paging signal is transmitted and the paging response signal is received from the end of the loop transmission path 12, and the normality of the short-circuit disconnection device is detected from the paging response signal.

When the transmission control unit 36 determines in step S10 that the predetermined waiting time has elapsed, the process proceeds to step S11, and in the event of a disconnection, in step S9, since a call response signal (short-circuit disconnection operation signal) indicating a short-circuit state has not been received, a short-circuit response is issued. The process proceeds to step S13, where a node map of the short-circuit disconnection devices 18-1 to 18-5 due to disconnection faults is created based on the starting end side connection order information detected in step S2 and the terminating end side order detection information detected in step S8. The process proceeds to step S15, where a node map including the short-circuit positions shown in FIG. 11, for example, is displayed on the display.

[Control of short circuit disconnection device]
FIG. 15 is a flowchart showing start-up control of the short-circuit disconnection device, which is a control operation by the control section 48 of the short-circuit disconnection device 18 shown in FIG. 4.

As shown in FIG. 15, when the operation is started by power supply from the loop transmission line 12, the control unit 48 turns off the switches 46-1 and 46-1 in step S21, and reads the type matching the self address in step S22. When it is determined that a signal has been received, the process proceeds to step S23, where a type response signal is transmitted, and then, in step S24, the switches 46-1 and 46-2 are turned on.

Subsequently, when the control unit 48 determines in step S25 that the predetermined inrush current waiting time has elapsed, the process proceeds to step S26, where the current limit release switch 56 is turned on, the current limit resistor 54 is bypassed, and the current limit is canceled. Therefore, even if the switches 46-1 and 46-2 are turned on, the inrush current flowing to charge the terminal on the secondary side is limited, and detection of an overcurrent fault on the receiver 10 side is prevented.

Next, the control unit 48 reads the line voltage detected by the voltage detection unit 52 and compares it with a predetermined short circuit threshold voltage, and if it is determined in step S28 that it exceeds the short circuit threshold voltage, the process proceeds to step S31. When it is determined that the state is normal and that the voltage is lower than the short circuit threshold voltage in step S28, the switches 46-1 and 46-2 are turned off in step S29 to disconnect the short circuit side, and then in step S30 it is determined that the short circuit state is present.

Subsequently, when the control unit 48 determines in step S32 that a calling signal matching the own address has been received via the transmission unit 50, the process proceeds to step S33 , and if the normal state has been determined in step S31, the control unit 48 determines whether the normal state is received. Instructs the transmission unit 50 to transmit a paging response signal indicating the short circuit state to the receiver 10, and if a short circuit state is determined in step S30, transmits a paging response signal (short circuit disconnection operation signal) indicating the short circuit state to the transmission unit 50. The command is sent to the receiver 10. As described above, even if a disconnection or short circuit occurs at startup, it is possible to display a node map corresponding to the disconnection or short circuit.

[Embodiment of distributed system composed of receivers and relay boards]
FIG. 16 is an explanatory diagram showing an outline of a distributed fire alarm system in which a relay board is connected to a receiver via a communication network.

If the facility to be monitored is divided into multiple locations and becomes large-scale, as shown in FIG. A communication connection is established between the receiver 10 and the relay board 70 via a network line 72 such as Ethernet (registered trademark).

The receiver 10 is the same as shown in FIG. 1, whereas the relay board 70 is the same as the receiver 10 in FIG. The other components are basically the same as the receiver 10.

A loop transmission line 12 is connected to the relay panel 70, and terminals such as a fire detector 16 and a short-circuit disconnection device 18, which have a transmission function and are set with unique addresses, are connected to the loop transmission line 12.

The relay board 70 is provided with a transmission control section 36, a transmission section 26, a termination voltage detection section 40, and termination switches 42-1 and 42-2, similar to the receiver 10 of FIG. When the termination voltage of the loop transmission line 12 is normally detected, the relay panel 70 performs start-end side transmission control to monitor fire by transmitting and receiving signals from the start end of the loop transmission line.

In addition, the relay board 70 detects a line failure due to a short circuit or disconnection in which the terminal voltage of the loop transmission line 12 is cut off, turns on a termination switch, and performs start-end side transmission control that transmits and receives signals from the start end of the loop transmission line 12. In addition, fires can be monitored by performing end-side transmission control that sends and receives signals from the end of the loop transmission line via a termination switch.

In addition, when the relay board 70 is started up, the transmission section of the relay board 70 provides a node map indicating the connection order of the short-circuit disconnection devices 18 from the relay board 70 by start-end side startup control if the loop transmission path 12 is normal. is generated, the node map information is transmitted to the receiver 10 via the network line 72, and the normal node map is displayed on the display of the receiver 10.

In addition, when there is a short circuit or disconnection in the loop transmission line 12, the transmission section of the relay board 70 indicates the connection order of the short circuit disconnection device 18 from each of the start end and the end end of the relay board 70 and the position of the short circuit or disconnection. A node map is generated, the node map information is transmitted to the receiver 10 via the network line 72, and the node map at the time of short circuit or disconnection is displayed on the display of the receiver 10.

[Modification of the present invention]
The display of the node map screen shown in the above embodiment is merely an example, and the node map may be displayed in an appropriate display format as needed. For example, it may be displayed as a list. The addresses may be displayed in order from the starting end of the transmission path.

Furthermore, when detecting the connection order during start-up control when the transmission path is normal, the connection location may also be detected for terminals other than the short-circuit disconnection device connected to the loop transmission path, such as a sensor or a transmitter.

Before transmitting the address of the short-circuit disconnection device, a terminal call signal is sent to the address of the terminal other than the short-circuit disconnection device, and if there is a response signal, the terminal call signal is sent to the short-circuit disconnection device at the beginning of the loop transmission path. It is detected as a terminal on the starting end side.

Next, when the address of the short-circuit disconnection device is transmitted and a response signal is received from any of the short-circuit disconnection devices, the address of the terminal other than the short-circuit disconnection device other than the terminal on the starting side of the short-circuit disconnection device at the end is sent. If a terminal call signal is transmitted and a response signal is received, it is detected as a terminal between the short-circuit disconnection device at the starting end and the short-circuit disconnection device second closest to the start end of the loop transmission path.

This is repeated to detect the terminal position of each short circuit disconnection device on the loop transmission line. The terminal positions detected in this way are displayed as a node map including the terminals. Further, the node map including the above-mentioned terminals may be displayed as a list. According to this, it becomes possible to easily identify a terminal that is unable to communicate when a disconnection or a short circuit is detected.

Further, the node map may be displayed on a device other than the receiver. For example, it may be sent to the comprehensive disaster prevention board and displayed, or it may be printed from the receiver. Further, node map information including terminals may also be output to the comprehensive disaster prevention panel, and disconnection locations and short circuit locations may be displayed on the map.

Further, the short-circuit disconnection device may be configured to notify with an indicator light, an alarm, etc. in response to a disconnection or short-circuit. For example, the short-circuit disconnecting device that performs the short-circuit disconnecting operation lights up the short-circuit disconnecting indicator light, and in the event of a disconnection, the receiver connects the last short-circuit disconnecting device on the starting end side and the last short-circuit disconnecting device on the terminating side. The short-circuit disconnecting device that has received the signal indicating the last short-circuit disconnecting device may turn on the disconnection indicator light.

In addition, although the above embodiment takes as an example a fire alarm system in which an R-type fire detector is connected via a loop transmission line from an R-type receiver, a loop-type fire alarm system connected from a P-type receiver is used as an example. The same applies to fire alarm equipment in which an address is set on the detector line and an addressable fire detector with a transmission function is connected.

Furthermore, the present invention includes appropriate modifications without impairing its objects and advantages, and is not limited by the numerical values shown in the above embodiments.

10: Receiver 12: Loop transmission line 14a, 14b: Signal line 16, 16-1 to 16-6: Fire detector 18, 18-1 to 18-5: Short circuit disconnection device 18-1a to 18-5a: Short circuit Disconnection device symbol 20: Main CPU
22-1, 22-2: Sub CPU board 24: Sub CPU
26, 50: Transmission section 27: Display 28: Display section 30: Operation section 32: Sound alarm section 34: Transfer section 36: Transmission control section 38: Fire alarm control section 40: Termination voltage detection section 42-1, 42 -2: Terminal switch 46-1, 46-2 : Switch 48: Control section 52: Voltage detection section 54: Current limit resistor 56: Current limit release switch 58-1, 58-2, 60-1, 60-2 : Diode 62: Node map display screen 64, 64-1, 64-2: Short circuit 64a, 64-1a, 64-2a: Short circuit symbol 66, 66-1, 66-2: Disconnection 66a, 66-1a, 66- 2a: Disconnection symbol 70: Relay board 72: Network line

Claims (10)

receiver and
a plurality of short-circuit disconnection devices connected in series to the loop transmission line connected to the receiver and switching the connection state of transmission lines located on both sides of the loop transmission line;
In fire alarm equipment equipped with
The short circuit disconnection device is
having a unique address in the loop transmission path,
When the power is not being supplied and when power is being supplied, the transmission line is in a disconnected state;
When an activation call signal including the unique address is received from the receiver after the start of the power supply, the transmission path is brought into a connected state and an activation response signal is sent to the receiver;
The receiver stores, as connection order information, that the short-circuit disconnection devices are arranged in the order in which the activation response signal is received;
When a short circuit occurs in a predetermined transmission line of the loop transmission line,
The short-circuit disconnection devices located on both sides of the transmission line where the short circuit has occurred perform a short-circuit disconnection operation to disconnect the transmission line, and also disconnect the short circuit as a paging response signal corresponding to the paging signal from the receiver. sends an operating signal,
The receiver identifies a short circuit location based on the short circuit disconnection operation signal and the connection order information,
When a disconnection occurs in a predetermined transmission line of the loop transmission line,
The receiver detects a disconnection and identifies the location of the disconnection based on a call response signal from the short-circuit disconnection device corresponding to the call signal from the receiver in which no short circuit is detected and the connection order information. Notification equipment.
receiver and
a plurality of short-circuit disconnection devices connected in series to the loop transmission line connected to the receiver and switching the connection state of transmission lines located on both sides of the loop transmission line;
In fire alarm equipment equipped with
The short circuit disconnection device is
having a unique address in the loop transmission path,
When the power is not being supplied and when power is being supplied, the transmission line is in a disconnected state;
When an activation call signal including the unique address is received from the receiver after the start of the power supply, the transmission path is brought into a connected state and an activation response signal is sent to the receiver;
The receiver includes:
storing as connection order information that the short-circuit disconnection devices are arranged in the order in which the activation response signal is received;
When detecting a line failure due to disconnection or short circuit of the loop transmission line, transmitting a call signal to the short circuit disconnection device from the starting end and the terminal end of the loop transmission line,
out of the call response signals corresponding to the call signal from the start end, identifying the short circuit disconnection device as the last short circuit disconnection device on the start end side based on the call response signal corresponding to the short circuit disconnection device closest to the end end side in the connection order information;
Among the call response signals corresponding to the call signal from the termination side, the short-circuit disconnection device is identified as the last short-circuit disconnection device on the termination side based on the call response signal corresponding to the short-circuit disconnection device closest to the start side in the connection order information. ,
A fire alarm system characterized by specifying that there is a line fault location between the last short-circuit disconnection device on the starting end side and the last short-circuit disconnection device on the terminal end side.
In the fire alarm equipment according to claim 2,
When the last short-circuit disconnection device on the start end side and the last short-circuit disconnection device on the termination side are not adjacent in the connection order information, the receiver A fire alarm system characterized by identifying the presence of a plurality of line faults between short-circuit disconnection devices.
In the fire alarm equipment according to claim 2,
When a short circuit occurs in a predetermined transmission line of the loop transmission line, the short circuit disconnection devices located on both sides of the transmission line where the short circuit has occurred perform a short circuit disconnection operation to disconnect the transmission line. fire alarm equipment.
In the fire alarm equipment according to claim 4,
The short-circuit disconnection device transmits a short-circuit disconnection operation signal to the receiver as the call response signal when the short-circuit disconnection operation is performed,
The receiver includes:
When receiving the short circuit disconnection operation signal and detecting a short circuit, specifying that there is a short circuit between the last short circuit disconnection device on the starting end side and the last short circuit disconnection device on the terminal side,
If a disconnection is detected without receiving the short-circuit disconnection operation signal, it is specified that there is a disconnection point between the last short-circuit disconnection device on the starting end side and the last short-circuit disconnection device on the terminal end side. fire alarm equipment.
In the fire alarm equipment according to claim 4,
The short circuit disconnection device is
a switch that changes the connection state of the transmission line;
a current limiting resistor connected in series with the switch;
a current limit release switch connected in parallel to the current limit resistor;
Equipped with
When the transmission line is connected by the switch, power is supplied from the primary side to the secondary side via the current limiting resistor to limit the current, and when a predetermined inrush current setting time has elapsed, the current limit is released. A fire alarm system characterized in that the current restriction is canceled by switching to power supply via a switch.
In the fire alarm equipment according to claim 5,
The short circuit disconnection device notifies short circuit disconnection when the short circuit disconnection operation is performed,
The receiver transmits a signal indicating the last short-circuit disconnection device to the last short-circuit disconnection device on the starting end side and the last short-circuit disconnection device on the termination side when detecting the disconnection,
A fire alarm system characterized in that the short-circuit disconnecting device that receives the signal indicating the last short-circuit disconnecting device notifies a disconnection.
In the fire alarm equipment according to any one of claims 1 to 7,
The fire alarm equipment is characterized in that the receiver generates and displays a node map regarding the connection order information.
One or more relay boards are connected to the receiver via a network line, and a terminal including a fire detector and a short-circuit disconnection device is connected to the loop transmission line connected to the relay board to monitor fire, and In a fire alarm system configured with a distributed system that notifies the receiver and outputs a fire alarm when a fire is detected at the relay board,
The short circuit disconnection device is
having a unique address in the loop transmission path,
When the power is not supplied and when the power supply is started, the transmission lines located on both sides of the loop transmission line are disconnected,
When an activation call signal including the unique address is received from the relay board after the start of the power supply, the transmission line is brought into a connected state and a activation response signal is sent to the relay board;
The relay board is
transmitting to the receiver as relay board connection order information that the short-circuit disconnection devices are arranged in the order in which the activation response signal is received;
When a short circuit occurs in a predetermined transmission line of the loop transmission line,
The short-circuit disconnection devices located on both sides of the transmission line where the short circuit has occurred perform a short-circuit disconnection operation to disconnect the transmission line, and also disconnect the short circuit as a call response signal corresponding to the call signal from the repeater board. sends an operating signal,
The relay board specifies a short-circuit location based on the short-circuit disconnection operation signal and the relay board connection order information, and transmits relay board connection order information that specifies the short-circuit location to the receiver,
When a disconnection occurs in a predetermined transmission line of the loop transmission line,
The relay board detects a disconnection, identifies the disconnection point based on the call response signal from the short-circuit disconnection device corresponding to the call signal from the relay board in which no short circuit is detected, and the relay board connection order information, and detects the disconnection. A fire alarm system characterized in that relay board connection order information with a specified location is transmitted to the receiver.
receiver and
a plurality of relay devices connected in series to a loop transmission line connected to the receiver;
In fire alarm equipment equipped with
The relay device has a unique address on the loop transmission path,
The receiver includes:
storing connection order information that is the order in which the relay devices are arranged in the loop transmission path;
When detecting a break in the loop transmission line,
transmitting a paging signal to the address of the relay device from the starting end and the terminating end of the loop transmission path;
identifying the last relay device on the starting end based on the calling response signal corresponding to the relay device closest to the terminating end according to the connection order information among the calling response signals corresponding to the calling signal from the starting end;
Identifying the last relay device on the terminating side based on the paging response signal corresponding to the relay device closest to the starting end according to the connection order information among the paging response signals corresponding to the calling signal from the terminating side;
A fire alarm system characterized by storing connection order information specifying that there is a disconnection point between the last relay device on the starting end side and the last relay device on the terminating end side .

Images