JPH0635581Y2 - Remote monitoring control system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention connects a central control unit and a terminal unit with a pair of signal lines, and transmits control data, monitoring data, etc. by time division multiplexing to remotely load. The present invention relates to a remote monitoring control system for controlling.

[Prior Art] Conventionally, a central control device and a large number of terminals having unique addresses are connected by a pair of signal lines, and each terminal device is accessed from the central control device to time-division multiplex the monitoring data and control data. In the remote monitoring and control system, when the specific load is controlled based on the switch operation information returned from the multiple monitoring terminals to the central controller, the operation information of the post operation is given priority. Thus, the central control unit accesses the terminal device for controlling the load and sends the control data. And, for example, when the operation at one place is temporarily given the initiative to the operation at the other place in a combination such as the front desk of a hotel and a banquet hall, the manager room of a gymnasium and the gymnasium It was set whether to connect each monitoring terminal to the signal line or not by switching the switch.

[Problems to be Solved by the Invention] In the above-mentioned conventional example, since the monitoring terminal device which does not have the initiative is disconnected from the signal line, the operation status cannot be displayed on the separated monitoring terminal device. There was a problem.

The present invention has been made in view of such a problem, and the load is operated and controlled by the monitoring terminal device having the initiative among the plurality of monitoring terminals for controlling the same load. It is an object of the present invention to provide a remote control system capable of displaying an operation state of a load on a visual terminal device that does not have the initiative.

[Means for Solving the Problems] In the present invention, a central control device and a large number of terminals having unique addresses are connected by a pair of signal lines, and each terminal is accessed from the central control device to monitor and control data. Enables time-division multiplex transmission of data and accesses and controls the control terminal to which the corresponding load is connected based on the switch operation information sent back from the monitoring terminal to the central controller as monitoring data. In a remote supervisory control system for sending data from a central control unit, a transmission signal from the central control unit, which is transmitted via a first signal line connected to the central control unit, is input via an isolation circuit and A driver circuit that relays to the second signal line, and a switch element that receives a return signal that is returned via the second signal line and that is connected in parallel to the first signal line according to the return signal. A receiver circuit for ON / OFF controlling the child and relay-transmitting a return signal by current to the central control unit, and a control data which is connected to the first signal line and is received at the time of access from the central control unit to force the switch element. A repeater having a control terminal for turning off is provided, and a monitoring terminal for operating the control terminal provided in the repeater is connected to the first signal line. is there.

[Operation] In the remote monitoring and control system according to the present invention, when the switch of the monitoring terminal connected to the first signal line for operating and controlling the terminal for controlling the repeater is operated, the return signal is transmitted by the signal line. It is short-circuited via the impedance and returned to the central monitoring device as a current signal.

When the operation information data is sent by this return signal, the central control unit 1 creates control data to be transmitted to the control terminal of the repeater based on the operation data, and when accessing the control terminal. Control data is transmitted to.

The accessed control terminal of the repeater operates based on the control data and releases the state of the switch element connected in parallel to the first signal line from the forced off state or sets the forced off state.

Here, when the forced off state is released, the switch element is turned on / off by the cylinder signal from the receiver circuit in the repeater and sends the current signal to the first signal line. That is, the return signal transmitted through the second signal line connecting the input side of the receiver circuit is relayed and transmitted by the receiver circuit.

That is, the operation information of the switch of the monitoring terminal for monitoring for operating the same load as the monitoring terminal connected to the first signal line can be returned to the central controller as a return signal. You can do it. Therefore, the monitoring terminal connected to the first signal line and the second monitoring terminal can operate the same load.

On the other hand, when the switch element is forcibly turned off, the return signal from the monitoring terminal connected to the second signal line cannot be relayed to the first signal line.

That is, the switch operation of the monitoring terminal connected to the first signal line has the initiative.

Now, in the central control unit, the control data for display is sent to the corresponding monitoring terminal at the time of access of the address based on the information on the load state sent from the control terminal for controlling the load, but it is relayed. Even if the switch element is forced off in the second signal line after the switch, it is relayed and sent out through the isolation circuit and the driver circuit, so that the monitoring terminal connected to the second signal line Also, the control data for display is transmitted, and the state of the corresponding load can be displayed based on this control data.

[Embodiment] FIG. 1 is a diagram showing an overall schematic configuration of a system of the present invention. A plurality of monitoring terminals having unique addresses are set on a first signal line 4 directly connected to a central control unit 1. 2 and the control terminal device 3 are connected, and the monitoring terminal device 2 is connected to the second signal line 6 connected via the relay device 5.

The transmission signal Vs transmitted from the central control unit 1 to the signal line 6 via the signal line 4 and the repeater 5 is, as shown in FIG. 2 (a), a start pulse signal ST indicating the start of signal transmission, a signal mode Indicating a mode data signal MD, an address data signal AD for calling the terminals 2 and 3, a control data signal CD for controlling the load L, a checksum data signal CS, and a return standby signal for setting a return period from the terminals 2 and 3. It is a multi-pole (± 24V) time division multiplex signal composed of WT, and data is transmitted by pulse width modulation. Each terminal 2,
In 3, when the address data of the transmission signal Vs received via the signal line 4 or its own unique address data match, the control data of the transmission signal Vs is taken in and the return standby signal WT of the transmission signal Vs is received. The monitor data signal is synchronously returned as a current mode signal (a signal which is sent by short-circuiting between the signal lines 4 and 6 via an appropriate low impedance).

Further, in the central controller 1, a dummy signal transmitting means for constantly transmitting the dummy transmission signal Vs by setting the mode data signal MD to the dummy mode, and FIG. 2 (b) returned from any of the monitoring terminals 2. There is provided an interrupt processing means for detecting the interrupt-generating terminal device 2 when the interrupt signal Vi as shown is received, accessing the terminal device 2 and returning the monitoring data.

On the other hand, when the monitoring terminal 2 receives the monitoring input by operating the switch S, the interrupt signal Vi is generated in synchronization with the start pulse signal ST of the dummy transmission signal Vs, and the central control unit 1 From the address confirmation mode, the interrupt generation means for returning its own unique address data in synchronization with the return standby signal WT and the central control unit 1 transmit the interrupt access mode transmission signal Vs in response to the interrupt. And a data returning means for returning the monitoring data corresponding to the monitoring input. Further, the central control device 1 creates control data to be transmitted to the control terminal device 3 based on the monitoring data returned from the monitoring terminal device 2 to the central control device 1, and transmits the control data to the control terminal device 3. Control the load L. Control terminal 3 arranged in the relay control panel 7
Has a contracted size for a distribution board, and a control output thereof controls a remote control relay for load control (a latching relay that can be turned on and off by a hand switch) 8.

FIG. 3 shows a circuit configuration of the control terminal device 3. The control terminal device 3 transmits the transmission signal Vs transmitted via the signal line 4.
, A signal processing circuit 11 for forming a circuit power supply, a signal processing circuit 11 for receiving the transmission signal Vs to perform signal processing and forming and transmitting a return signal V, an address setting unit 12 for setting a unique address, and 1 When controlling individual loads,
A circuit number setting unit 13 that sets which circuit controls the load from among four control circuits (corresponding to 4 control data bits), and a drive circuit 14 that drives a load control relay circuit 15. And a monitoring circuit 16 for monitoring the operating state.The signal processing circuit 11 detects a match between the address data of the transmission signal Vs and the unique address, and when the address match is detected, the control data is fetched to obtain the circuit number. A control output is formed based on the bit selected by the setting unit 13 to drive the relay circuit 15, and a monitoring circuit 16
The monitor data for return is formed on the basis of the load monitor input inputted via the, and is returned to the central controller 1 by the return signal V in the current mode. Note that the circuit number setting unit 13 is not provided in the control terminal device 3, and the relay circuit 15 is configured to control the load by each bit of the control data.
May be formed to form four control circuits.

FIG. 4 shows the monitoring terminal device 2. The circuit configuration is substantially the same as the circuit configuration of the control terminal device 3 described above.
The state of the switch S ₁ such as an individual control switch or a pattern control switch is monitored at 16, and monitoring data is formed by the signal processing circuit 11 based on this switch monitoring input,
It is designed to be returned to the central control unit 1 by the above-mentioned interrupt processing, for the ON display of the operation display circuit 15 ',
The off display light emitting diode is made to blink based on the control data (indicating the operating state of the load) transmitted from the central control unit 1. In addition, the unique address can be set by the DIP switch of the address setting unit 12 such that the lower 6 bits of the 8-bit address data can be appropriately set by the user and the upper 2 bits can be set by the maker. For monitoring and control) settings, for monitoring,
Both terminals 2 and 3 can be easily made to correspond by simply setting the user setting part of the unique address of the control terminals 2 and 3 to the same value, and returned from the monitoring terminal 2 set to the same value. The control terminal 3 based on the monitored data of the switched switch S _1.
The load L ₁ connected to is controllable. When the monitoring terminal 2 monitors the switch states of the plurality of switches S, the circuit number setting unit 13 is not necessary, and the plurality of switch S states may be input to the monitoring circuit 16. .

Also, monitoring the switch state of the pattern control switch
When the on / off operation of the pattern control switch is recognized, the pattern control means of the central control device 1 stores the pattern control switch in correspondence with the pattern control switch. The pattern control data is read from the data storage unit to form the control data of the load included in the control pattern, and the control data for the collective load control is transferred to the control terminal 3 to which the collective control load is connected. It is designed to sequentially access and send out, and collectively control a plurality of loads. The pattern control data is set by a pattern setting terminal (not shown) including a monitoring terminal 2 and a data input unit, and the set data is appropriately transferred to the central control unit 1 and the data is set. It is designed to be stored in the storage unit.

FIG. 5 shows the structure of the repeater 5 used in the present invention.
This repeater 5 is a transmission signal from the central control unit 1 transmitted via the first signal line 4 connected to the central control unit 1.
A driver circuit 18 that inputs Vs through an isolation circuit 17 including a photocoupler and relays it to the second signal line 6.
And a return signal returned via the second signal line 6 is input, and the switch element 19 connected in parallel to the first signal line 4 is turned on / off according to the return signal to perform central control. Receiver circuit that relays the return signal by current to the device 1
20 and a control terminal 3a which is connected to the first signal line 4 and forcibly turns off the switch element 19 by the control data received from the central control unit 1 at a later-described access time.
Equipped with. The photocoupler is turned on / off according to the transmission signal Vs transmitted on the signal line 4. Terminal 3a is relay Ry
The relay contact r is connected in parallel to the base circuit of the switch element 19 composed of a transistor.
The base current can be bypassed.

The monitoring terminal 2a for operating the control terminal 3a is connected to the signal line 4, so that the switch Sa of the terminal 2a can forcibly turn off the switch element 19. It has become. Thus, the terminal device of the repeater 5
In 3a, like the other control terminals 3, ..., the transmission signal Vs including the control data signal DC based on the operation of the switch Sa of the corresponding monitoring terminal 2a and the address data signal AD of the terminal 3a. Is transmitted from the central control unit 1 on the signal line 4 and accessed, the relay is performed based on the control data signal CD.
By controlling Ry, the relay contact r can be turned on or off, and when the relay contact r is turned on, the base current flowing from the receiver circuit 20 to the base of the switch element 19 is bypassed and the switch element 19 is turned on. When the relay contact r is turned off forcibly and the relay contact r in the on state is turned off, a base current can be passed from the receiver circuit 20 to the base of the switch element 19 to be turned on.

[Advantages of the Invention] The present invention inputs the transmission signal from the central control unit, which is transmitted through the one signal line connected to the central control unit as described above, through the isolation circuit and outputs the second signal. The driver circuit relaying to the line and the return signal returned via the second signal line are input, and the switch elements connected in parallel to the first signal line are controlled to be turned on and off according to the return signal, A receiver circuit for relaying a return signal by current to the central control unit, and a control terminal connected to the first signal line and forcibly turning off the switch element by control data received at the time of access from the central control unit. And a monitoring terminal for operating the control terminal provided in the repeater is connected to the first signal line, the operation is performed while checking the load state. Set prohibition switch Therefore, there is an effect that the operation due to erroneous scanning is eliminated.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram of a remote monitoring control system according to the present invention, FIG. 2 is an operation explanatory diagram of the same as above, FIG. 3 is a block circuit diagram of main parts of the same, and FIG. 4 is a block circuit diagram of main parts of the same. FIG. 5 is a block circuit diagram of the main part of the above. 1 is a central control unit, 2 and 3a are terminals, 5 is a repeater, 4 and 6 are signal lines, 17 is an isolation circuit, 18 is a driver circuit, 18 is a receiver circuit, and 19 is a switch element.

Claims (1)

[Scope of utility model registration request] 1. A central control unit and a large number of terminals having unique addresses are connected by a pair of signal lines, and each terminal is accessed from the central control unit to transmit monitoring data and control data by time division multiplexing. The control terminal is connected to the corresponding load based on the switch operation information returned as monitoring data from the monitoring terminal to the central controller, and the control data is accessed from the central controller. In a remote monitoring and control system for sending out, a transmission signal from the central control unit, which is transmitted via a first signal line connected to the central control unit, is input via an isolation circuit and relayed to a second signal line. And a return signal to be returned via the second signal line, and controls ON / OFF of the switch element connected in parallel to the first signal line in response to the return signal. A receiver circuit for relaying a return signal by current to the central control unit, and a control terminal connected to the first signal line and forcibly turning off the switch element by control data received at the time of access from the central control unit. A remote monitoring device comprising: a relay device including: and a monitoring terminal device for operating the control terminal device provided in the relay device, connected to the first signal line. Control system.