JPH10327215A - Monitor and control system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To allow the system to detect a fault that takes place in a standby channel route in the monitor and control system that selects either of a center station equipment and each monitor and control terminal station between which are configured by a two-channel route and makes communication with the selected equipment. SOLUTION: In the monitor and control system, a center station equipment 30 having active system/standby system processing sections 31, 32 in duplicate makes communication with a monitor and control terminal 10 having an active system 12 and a standby system 13 in duplicate via a packet exchange network 40 by one of two-line routes as an operating route. In this case, the standby system processing section 32 of the center station equipment 30 not active makes communication with the standby system 13 of the monitor and control terminal 10 not active through a standby channel route not used by the active system to monitor a state of the standby channel route and to detect whether or not the standby channel route is in a communication available state thereby reporting it to each active system.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a supervisory control system for managing a plurality of supervisory control terminals by a center station device,
In particular, the present invention relates to detection of the state of a protection line route when the center station device and the monitoring control terminal have a two-line route configuration.

[0002]

2. Description of the Related Art FIG. 5 is a block diagram showing a conventional supervisory control system, in which 10 is a plurality of supervisory control terminals, 20 is a monitored and controlled device monitored and controlled by each supervisory control terminal 10.
0 is a center station device that communicates with each monitoring control terminal 10, 4
Reference numeral 0 denotes a packet switching network that relays communication between the center station device 30 and each monitoring control terminal 30.

The monitoring control terminal 10 has a switching unit 11 composed of a switch for switching a communication route, an active system 12 which is always used, and a standby system 13 which is not normally used as a backup. The active system 12 and the standby system 13 have the same configuration, and each includes a communication interface 14, a main processing unit 15, and a monitoring control input / output unit 16.

[0004] The center station device 30 has an active processing unit 31 that is always used, a standby processing unit 32 as a backup, and an operation terminal 33. Note that FIG.
Is in the state shown in the figure, the A route which is a normal communication line route is used.

FIG. 6 shows a state in which a failure has occurred in the route A, the switch is switched, and the route B is used.

As described above, in the conventional monitoring and control system constituted by the center station device 30 and the plurality of monitoring and control terminals 10, each device has a dual working / standby system and the center station device 30 And each monitoring and control terminal station 10
The monitoring and control terminal 10 switches the line route by using a switch for switching the route, and selects one of them to perform communication. That is,
When a failure is detected in the operating communication route (A route), communication is performed by switching to the other protection line route (B route). In such a method, since the protection line route is normally unused at all times, even if there is an abnormality in the protection line route, it cannot be detected.

[0007]

As described above, in a monitoring and control system in which a conventional center station device communicates with a plurality of monitoring and control terminals, two lines are physically used as communication line routes as shown in FIGS. For systems with routes, 2
Communication is performed between the center station device and the supervisory control terminal using only one of the circuit routes as the operation route. Therefore, since the protection line route where no communication is performed in the conventional method is normally in an unused / no communication state, even if a line failure occurs in this route, it cannot be detected and the state of the protection line route is grasped. It becomes impossible state. In this state, if a failure occurs in the operation route, it is detected that this route is a failure for the first time when communication is started after switching to the failed protection line route, and the reliability by the two-line route is established. There was a problem that the effect of sex could not be exhibited.

An object of the present invention is to provide a center station apparatus (active system).
In a system having two circuit routes between the supervisory control terminals (working systems), one of which communicates as the working line route and the other as the spare line route, a center station device standby system and a supervisory control terminal standby system are used. An object of the present invention is to make it possible to monitor the state of a protection line route without increasing the load of communication processing of an active system by causing communication using a protection line route not used for operation.

[0009]

According to the present invention, in order to achieve the above object, a center station apparatus and a supervisory control terminal periodically communicate with each other using a standby system and a protection line route. Accordingly, there is provided a detecting means for detecting the failure of the protection line route and notifying each working system.

[0010] Further, one of the two signal processing systems in the center station device and the supervisory control terminal is either the working system or the standby system, and one of the two circuit routes is the working circuit route or the working circuit route. Selection means for selecting whether to use the protection line route may be provided.

[0011]

FIG. 1 is a block diagram showing an embodiment of the present invention, and portions corresponding to those in FIGS. 5 and 6 are denoted by the same reference numerals. As shown in FIG. 1, the supervisory control terminal 10 has a redundant configuration of 0 system / 1 system (active system / standby system).
Basically, the configuration is the same as the conventional one, and communication (inter-system communication) is performed between the 0 system and the 1 system. Further, the switch of the switching unit 11 for switching the line route is controlled to connect the “two line routes” with the “system 0 or 1 in the supervisory control terminal 10”.

The center station device 30 has a duplex system of 0 system / 1 system, and each system has a main processing unit 34, a communication interface 35 for the monitoring control terminal 10, an operation terminal interface 36, and a database 37. And operates as active / standby. Communication (system communication) is performed between system 0 and system 1.

Next, the operation of the embodiment of the present invention will be described with reference to FIG. After the start of the supervisory control terminal 10, the main processing unit 15 of the active system 12 controls the switch of the switching unit 11 to select the connection between the communication interface 14 of the active system 12 and one of the circuit routes. 40 and the X25 protocol to perform link connection processing at the layer 2 level, and perform a call connection (X2
5 protocol layer 3 level connection). On the other hand, in the center station device 30, the active processing unit 31 performs link connection processing with the packet switching network 40 at the layer 2 level of the X25 protocol, and performs call connection to the monitoring control terminal 10 through the active route. As a result, communication between the center station device 30 and the supervisory control terminal 10 is performed via the working line route.

The active processing unit 31 of the center station apparatus 30 and the active system 12 of the supervisory control terminal 10 notify the standby processing unit 32 and the standby system 13, respectively, that they are in communication with the active trunk route. After receiving this notification, the main processing unit 15 of the standby system 13 of the supervisory control terminal 10 makes a link connection with the packet switching network 40 at the protocol layer 2 level through the line route which is the protection line route by the switch switching operation, The call connection (X
25 protocol layer 3 level connection).

After receiving the notification of the active system route communication establishment state from the active system processing unit 31, the standby system processing unit 32 of the center station device 30 transmits the standby system processing unit 32 of the supervisory control terminal 10 through the line route which is the protection line route. 13 is connected. In this state, the standby system processing unit 32 of the center station device 30
And the standby system 13 of the supervisory control terminal 10 perform transmission and reception periodically using the protection line route. As a result, it is possible to confirm whether or not the protection line route is usable without affecting the data transmission / reception processing in the current operation.

Next, a more detailed embodiment of the operation will be described in detail with reference to FIGS. As described above, in the normal operation, both the center station device 30 and the supervisory control terminal 10 perform processing by the active system, the standby system does not perform processing related to supervisory control, and when a failure occurs in the active system, each device becomes active. / Standby switching is performed by a switch of the switching unit 11. FIG. 3 shows an example of a control pattern of the switch.

The operation will be described with reference to the block diagram of FIG. 2 and the sequence chart of FIG. The monitoring control terminal 10 starts up as the active system 12 as the system 0 and as the standby system 13 as the system 1.
The main processing unit 15 of the active system 12 controls the switch of the switching unit 11 so that the communication interface 14 of the own system is connected to the route A in FIG. 2 (101 in FIG. 4). The active system 12 of the supervisory control terminal 10 performs a link connection process with the packet switching network 40 at the X25 protocol layer 2 level via the A route, and a call connection from the center station device 30 (X25 protocol layer 3 level connection). It is in a waiting state (102).

In the center station device 30, after the active processing unit 31 performs the link connection processing with the packet switching network 40 at the layer 2 level of the X25 protocol, the call connection processing is performed on both the A route and the B route in FIG. Perform (103). As a result, the call connection is performed on the A route in which the supervisory control terminal 10 and the packet switching network 40 are linked, and thereafter the A route is set as the working route and the center station device 30 to the supervisory control terminal 1
Communication such as transmission / reception of monitoring / control data is performed between 0 (104). At this time, since the B route is not linked, the packet switching network 40 responds to the call connection request.
Then, the call connection is notified and the communication connection state is not established.

After the call connection, the active system processing unit 31 of the center station device 30 and the active system 12 of the supervisory control terminal 10 notify their respective standby systems that the A route is operated as the active line route ( 105). After receiving this notification, the standby processing unit 32 of the center station device 30 switches the switching unit 1
1 at the protocol layer 2 level via the unused B route, and the call connection (X
25 protocol layer 3 level connection) waiting state (106).

The standby processing unit 3 of the center station device 30
2 receives the notification that the active system route = A route communication is in progress from the active system 12, and then makes a call connection to the supervisory control terminal 10 via the B route which has become the protection line route (107). By this call connection, the center station standby system and the supervisory control terminal standby system can communicate with each other using the protection line route. Furthermore, by transmitting and receiving arbitrary data periodically, it can be confirmed that the B route = the protection line route is in a state where normal communication is possible (108).

If a fault occurs in the B route, the standby system at the center station and the standby system at the supervisory control terminal detect a communication abnormality with each other to detect a fault in the protection line route, and the fault is detected by each working system processing unit. And the center station device 30 outputs an abnormality in the protection line route to the operation terminal 33 (1).
09). Further, the center station standby system and the supervisory control terminal standby system periodically perform link connection and call connection processing using the protection line route = B route even after a communication error, and resume communication after the B route is restored (110).

The switch of the switching unit 11 is set at the fault occurrence position of each of the routes A and B (for example, between the center station device 30 and the packet switching network 40 or the packet switching network 40).
3 and the monitoring control terminal 10).
By switching as shown in (b), the active system and the standby system can be switched.

[0023]

As described above, according to the present invention, it is possible to confirm whether or not a standby line route that is not used for operation is in a communicable state, thereby causing a failure in the standby line route. In this case, it can be repaired in advance, and the working line route becomes abnormal and switches to the protection line route.
The original effect of rooting can be exhibited to improve the reliability of the system. Further, by causing the standby system to perform communication processing, it is possible to suppress an increase in the load and processing due to the introduction of this method in the transmission and reception processing of the active system of the center station device and the monitoring control terminal.

The working system, the standby system, the working line route,
By providing the selection means for selecting the protection line route, it is possible to establish communication by the line route according to the failure occurrence position.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention.

FIG. 2 is a block diagram showing an embodiment of the present invention.

FIG. 3 is a configuration diagram illustrating a control pattern of a switch of a switching unit.

FIG. 4 is a sequence chart showing an operation.

FIG. 5 is a block diagram showing a case where a route A of a conventional monitoring and control system is used.

FIG. 6 is a block diagram showing a case where a route B of a conventional monitoring and control system is used.

[Explanation of symbols]

 REFERENCE SIGNS LIST 10 supervisory control terminal 11 switching unit 12 active system 13 standby system 30 center station device 31 active system processing unit 32 standby system processing unit 40 packet switching unit

Claims (2)

[Claims] 1. A center station device having two signal processing systems and a supervisory control terminal having two signal processing systems are connected through two circuit routes via a switching network. The terminal uses one of the signal processing systems as a working system and the other signal processing system as a standby system, and uses one circuit route as a working circuit route and uses the other circuit route as a protection circuit route. In the supervisory control system for performing communication, the center station device and the supervisory control terminal perform communication periodically using the respective standby systems and the backup line route, thereby detecting a failure in the backup line route. A monitoring control system comprising a detection unit for notifying each of the active systems. 2. The two signal processing systems in the center station device and the supervisory control terminal, which of the two are used as the working system or the standby system, and which of the two circuit routes is the working circuit route or the protection circuit route. 2. The monitoring and control system according to claim 1, further comprising a selection unit for selecting whether or not to perform the setting.