JPH09247766A - Remote supervisory control system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To secure information transmission function between a master station and a slave station even when any tele-controller of the master station and the slave station acts as a master and to secure information transmission func tion even when the fault of the tele-controller and the line fault in either of A, B systems are caused simultaneously. SOLUTION: The system is provided with a master station side changeover unit 5 which switches input output information between tele-controllers 1A, 1B of a master station 1 and a slave station 2 and couples the selected MODEMs 3A, 3B of the system A, B and also with a slave station side changeover unit 6 which switches input output information between tele-controllers 2A, 2B of slave stations and couple the selected MODEMs 4A, 4B of the system A, B. Thus, the transmission system configuration is selected in crossing with the tele-controllers.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a distant monitoring control system, and more particularly to a communication system in which a system between a redundant master station and slave station is switched.

[0002]

2. Description of the Related Art A supervisory control system often employs a duplex system in order to improve its reliability. FIG. 2 shows a duplex system, in which two sets of tele-controllers 1A, 1B, 2A and 2B are provided in the master station 1 and the slave station 2, respectively, and the tele-controller 1A and the tele-controller 2A are dedicated via the modems 3A and 4A. A system that is connected by a telephone line, and B that connects the tele-controller 1B and the tele-controller 2B by a dedicated telephone line through modems 3B and 4B.
Depending on the system, duplex communication is possible.

Each telecontroller 1A, 1B, 2A, 2
B is a PLC (programmable logic controller:
A general-purpose sequence controller) configuration is used, and communication is performed in the HDLC transmission control procedure.

[0004]

In the conventional system, normally, the A system using the telecontrollers 1A and 2A is the master, the B system using the telecontrollers 1B and 2B is the slave, and the A system on the master side. The information sent and received by the slave side is used as system information, and the information is sent and received by the slave side when the master side has a line failure or is down.

Therefore, in a failure state in which the master of the master station 1 is the tele-controller 1A and the master of the slave station 2 is the tele-controller 2B, it becomes impossible to exchange information between the master station 1 and the slave station 2.

When the line of the A system is normal and the line of the B system is down, information cannot be exchanged when the telecontrollers 1B and 2B are masters.

As described above, in the conventional system, since the fixed connection is made for each system, even if the redundant configuration is adopted, the master,
Communication may be lost depending on the setting status of the slave and the normal / abnormal status of the line.

It is an object of the present invention to provide a remote monitoring and control system that reduces the occurrence of communication incompatibility.

[0009]

According to the present invention, the tele-controllers of the master station and the slave station are duplicated, and a communication line such as a system A and a system B is provided between the master station and the slave station. In the remote monitoring and control system of the duplex configuration, the master station 2
Master station side switching unit capable of switching input / output information with one telecontroller and connecting to the communication lines of the A system and the B system, and switching input / output information with two telecontrollers of the slave station and the A system. And a slave station side switching unit that can be connected to a B-system communication line.

[0010]

FIG. 1 is a system configuration diagram showing an embodiment of the present invention. 1 is different from FIG. 1 in that the master station 1 and the slave station 2 are provided with switching units 5 and 6, and
The LC type transmission control unit has a 2-port type.

The switching unit 5 switches the transmission input / output information of the telecontrollers 1A, 1B under the control of the telecontroller 1A and couples it to the modem 3A, and the transmission input / output information of the telecontrollers 1A, 1B. Modem 3B is switched under the control of the telecontroller 1B
A second switching circuit coupled to the.

Similarly, the switching unit 6 switches the transmission input / output information of the telecontrollers 2A and 2B under the control of the telecontroller 2A and couples it to the modem 4A, and the transmission input of the telecontrollers 2A and 2B. A second switching circuit for switching output information under the control of the telecontroller 2B and coupling it to the modem 4B.

Transmission control units 7A, 7B, 8A, 8B
Has a two-port configuration in order to exchange the same information input and output by each telecontroller with the switching unit.

The switching control of the switching circuits of the switching units 5 and 6 is such that the first switching circuit is switched by the A system telecontrollers 1A and 2A, and the second switching circuit is switched to the B system telecontrollers 1B and 2B. Switch with.

In the present embodiment, when the A system is the master, the switching units 5 and 6 are set to the switching state shown in the figure, and the input / output information of the telecontroller 1A is switched to the switching unit 5 → modem 3A → modem 4A → switching unit. The same information is exchanged with the telecontroller 2A through the switching unit 5 → modem 3B → modem 4B → switching unit 6 in parallel with the transmission / reception with the telecontroller 2A through 6.

Similarly, when the B system is used as the master, the switching units 5 and 6 are switched from the state shown in the figure, and the same information is transmitted between the telecontrollers 1B and 2B by the two A and B.
Transfer through one system.

With such a system configuration, the same input / output information is transmitted and received through the two systems of A and B, and the transmission information of the two systems can be matched with each other to improve the reliability of information transmission.

Next, in the event of a tele-controller failure or a line failure, for example, the master of the master station 1 has the tele-controller 1A.
Then, in a failure state in which the master of the slave station 2 becomes the telecontroller 2B, the telecontroller 2B switches the second switching circuit of the switching unit 6 from the state shown in the drawing, and the telecontroller 1A → the switching unit 5 → the modem 3B →
Information can be exchanged between the master station 1 and the slave station 2 via the route of the modem 4B to the telecontroller 2B.

When the line of the A system is normal and the line of the B system is down and the telecontrollers 1B and 2B are masters, the telecontroller 1B → the switching unit 5
The information can be exchanged through the route of the first switching circuit of the above-mentioned → modem 3A → the modem 4A → the first switching circuit of the switching unit 6 → the tele-controller 2B.

As described above, in the present embodiment, it is possible to switch to a transmission system configuration in which the telecontrollers are crossed by the switching units 5 and 6, and it is impossible to communicate in the master / slave setting state and the normal / abnormal state of the line. Can be reduced.

[0021]

As described above, according to the present invention, since the switching unit is provided in the master station and the slave station so that the transmission can be switched to the transmission system configuration in which the telecontrollers are crossed, the master station and the slave station can be switched. Even if the tele-controller becomes the master, the information transmission function between the master station and the slave station can be secured. In addition, the information transmission function can be secured even if the failure of the telecontroller and the line abnormality of either the A or B system occur at the same time.

[Brief description of drawings]

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

FIG. 2 is a configuration diagram of a conventional remote monitoring control system.

[Explanation of symbols]

 1 ... Master station 2 ... Slave station 1A, 1B, 2A, 2B ... Tele controller 3A, 3B, 4A, 4B ... Modem 5 ... Master station side switching unit 6 ... Slave station side switching unit 7A, 7B, 8A, 8B ... Transmission Controller unit

Claims (1)

[Claims] 1. A dual controller for a master station and a slave station, and a system A and a system B between the master station and the slave station.
In a distant monitoring control system of a redundant configuration provided with a communication line for a master station, etc., a master station side switching unit capable of switching input / output information with two telecontrollers of the master station and connecting to the communication circuits of the A system and the B system And a slave station side switching unit capable of switching input / output information with the two telecontrollers of the slave station and coupling to the communication lines of the A system and the B system.