JP5836853B2 - Monitoring system and maintenance method using the same - Google Patents

Description

  The present invention relates to a monitoring system and a maintenance method using the same.

  Monitored unmanned stations by connecting the redundant control and control devices installed in the unmanned stations and the redundant control and control devices installed in the manned stations with the data communication network (dedicated line) of the duplex structure. A monitoring system is shown in FIG.

The redundant control devices 2A and 2B provided in the unmanned station 2 have equivalent monitoring functions, and one monitoring control device, for example, the first monitoring control device 2A is used as an active system, and the other monitoring control device, for example, The second monitoring control device 2B operates as a standby system, and outputs monitoring information by inputting and processing the same status signal from the monitored device.
The supervisory control devices 3A and 3B having a duplex structure provided in the manned station 3 have equivalent monitoring functions, and one supervisory control device, for example, the first supervisory control device 3A is used as an active system, and the other supervisory control device, for example, The second monitoring control device 3B operates as a standby system.

  The monitoring control devices 2A and 3A that operate in the active system communicate with each other using the first data transmission network (private line) 6A, and the monitoring control devices 2B and 3B that operate in the standby system. Performs communication of the monitoring information using a second data transmission network (private line) 6B. The standby monitoring control devices 2B and 3B discard the monitoring information received via the second data transmission network 6B and normally use the monitoring information communicated in the active system. The first and second supervisory control devices 2A and 2B of the unmanned station 2 and the supervisory control devices 3A and 3B of the manned station 3 are connected by transmission lines 4 and 5, and the standby system monitors the active system. The system is switched by detecting abnormalities and faults.

  For remote maintenance operations such as changing the setting information (table) of the unmanned station 2 and the collecting of history information of the unmanned station 2 that are difficult to enter immediately, the maintenance console 8 is connected to the monitoring control apparatuses 3A and 3B of the manned station 3 It is necessary to connect data from the manned station 3 to the monitoring control devices 2A and 2B of the unmanned station 2 using the data transmission networks 6A and 6B.

  However, between the supervisory control devices 2A, 2B, 3A, and 3B between the manned station 3 and the unmanned station 2, the monitoring information is transmitted through the data transmission control procedure such as HDLC (High-level Data Link Control procedure) using a modem or the like. Is doing. Therefore, it is difficult for the data transmission networks 6A and 6B during this period to transmit and receive the maintenance information due to the limitation of the transmission speed. Therefore, remote maintenance is performed by connecting the maintenance console 8 and the monitoring control devices 2A and 2B of the unmanned station 2 using another telephone line 7.

  By the way, in the remote maintenance method in which the maintenance target device and the remote maintenance center are connected by a public line, the communication means for simultaneously performing communication between the maintenance target device and the two remote maintenance centers is disconnected while continuing the remote maintenance. There is known a remote maintenance line duplex system including a means for performing reconnection of a line (Patent Document 1).

JP-A-10-312317

  However, as described above, when performing remote maintenance of the unmanned station 2 that is difficult to enter, the telephone line 7 must be separately prepared in addition to the data transmission networks 6A and 6B, which increases equipment costs. Further, in the invention described in Patent Document 1, since the maintenance line is doubled as a countermeasure against the line failure, the equipment cost is further increased. Therefore, it is desired to perform data communication of maintenance information so as not to affect monitoring information data communication.

  An object of the present invention is to provide a monitoring system devised so that maintenance information can be communicated so as not to affect communication of monitoring information transmitted and received by a monitoring control device.

One aspect of a monitoring system illustrating the present invention is provided in an unmanned station, acquires monitoring information from a first monitored device, monitors the first monitored device, and sets one of them as an operating system , The monitoring control device with a redundant structure that operates as a standby system and the manned station, monitors the first monitored device by obtaining the monitoring information of the first monitored device from the monitoring control device provided in the unmanned station and, as one of the active system and the other a monitoring control device of the dual structure which operates as a standby system, the monitoring control device between operating in the active system provided in the unmanned station and manned station is first monitored device A first packet communication network that communicates monitoring information, and a second packet communication network in which monitoring control devices operating in a standby system provided in the unmanned station and the manned station communicate the monitoring information of the first monitored device Monitoring control that operates in a standby system provided in a manned station It is connected to the location, for maintenance between the monitoring controller using only the second packet communication network among the first and second packet communication network operating in the monitoring control unit and the standby system provided unmanned station And a maintenance terminal for communicating information.

  In the present invention, communication of maintenance information is performed using the second packet communication network used by the monitoring control device operating in the standby system, not the first packet communication network used by the monitoring control device operating in the active system. Therefore, it does not affect the monitoring information communication.

It is explanatory drawing which shows the outline of the monitoring system of this invention. It is a block diagram which shows the outline of a monitoring control apparatus. It is a flowchart which shows the operation | movement procedure at the time of abnormality / failure detection of the monitoring control apparatus which operate | moves by a standby system. It is a flowchart which shows the maintenance procedure of the monitoring control apparatus which operate | moves in the standby system of an unattended station. It is explanatory drawing which shows the outline of the monitoring system demonstrated by the prior art.

  As shown in FIG. 1, the monitoring system 10 includes first and second monitoring controllers 12 and 13 having a duplex structure provided in the unmanned station 11 and first and second monitoring having a duplex structure provided in the manned station 14. The control devices 15 and 16 are connected to each other by first and second packet communication networks 17 and 18 having a duplex structure.

The monitoring control devices 12 and 13 of the unmanned station 11 have the same monitoring function, and operate in synchronization with each other as one operating system and the other as a standby system. The monitoring control devices 15 and 16 of the manned station 14 have the same monitoring function, and operate in synchronization with each other as one operating system and the other as a standby system. The supervisory control devices 12, 13, 15, 16 of the unmanned station 11 and the manned station 14 use the first packet communication network 17 when operating in the active system, and the second packet communication network when operating in the standby system. 18 is used.
Each of the monitoring control devices 12 and 13 of the unmanned station 11 is connected to, for example, a plurality of switchboards (hereinafter referred to as “first monitored devices”) provided in the plant, and is connected to the first monitored devices. The operation of the first monitored device and the status of operation are monitored by communicating individual input / output data (monitoring information).

  The monitoring control devices 12 and 13 of the unmanned station 11 are connected by a dedicated transmission line 19. Among these, the monitoring control device 13 operating in the standby system monitors the operation status of the monitoring control device 12 operating in the active system, and controls system switching between the active system and the standby system based on the determination of the operating status. In addition, in response to receiving system switching data obtained from the supervisory control devices 15 and 16 of the manned station 14 described later in detail, the system switching of the supervisory control devices 12 and 13 is also controlled.

  The monitoring control devices 15 and 16 of the manned station 14 are connected to a switchboard (hereinafter referred to as “second monitored device”) provided in a plant different from that monitored by the unmanned station 11 through a network. The operation of the second monitored device and the status of operation are individually monitored by communicating individual input / output data (monitoring information) with the monitored device. In addition, the monitoring control devices 15 and 16 of the manned station 14 receive the individual input / output data obtained from the first monitored device via the monitoring control devices 12 and 13 of the unmanned station 11 and receive the first monitored device. To monitor. Furthermore, the monitoring control devices 15 and 16 of the manned station 14 are connected to the host device via a network, and transmit individual input / output data obtained from the first and second monitored devices to the host device.

  The monitoring control devices 15 and 16 of the manned station 14 are connected by a dedicated transmission path 20. Among these, the monitoring control device 16 operating in the standby system monitors the operation status of the monitoring control device 15 operating in the active system, and controls system switching between the active system and the standby system based on the determination of the operating status. The system switching is controlled in response to receiving the system switching information obtained from the supervisory control device 13 operating in the standby system on the unmanned station 11 side.

  Note that the monitoring control devices 15 and 16 of the manned station 14 may transmit individual input / output data obtained from the second monitored device to the monitoring control devices 12 and 13 of the unmanned station 11. The monitoring control devices 12, 13, 15, and 16 have means for discarding individual input / output data received from the game monitoring control device via the packet communication network when operating in the standby system.

  When performing maintenance of the monitoring control devices 12 and 13 of the unmanned station 11 such as setting information (table) change and history information collection from a remote location, the maintenance console (maintenance terminal) 21 is placed on standby of the manned station 14. The second monitoring control device 16 operating in the system is connected to the second monitoring control device 16, and the second monitoring control device 13 operating in the standby system of the unmanned station 11 is maintained using the second packet communication network 18.

  The monitoring control devices 12, 13, 15, and 16 all have the same configuration. For example, the first monitoring control device 12 of the unmanned station includes a basic processing unit 25 and an interface unit 26 as shown in FIG.

The basic processing unit 25 includes a ROM 28, first and second memories (storage units) 29 and 30, and a control unit 31 that performs overall control thereof. The control unit 31 includes a status determination unit 32 that performs monitoring between systems, an inter-system switching control unit 33 that controls switching between the active system and the standby system based on the determination of the status determination unit 32, and an access control unit 39.
The interface unit 26 includes a line processing unit 34, a maintenance line processing unit 36, an individual input / output processing unit 37, and an intersystem processing unit 38.

  The line processing unit 34 performs line processing of packet data communicated with the first monitoring control device 15 of the manned station 14 via the first packet communication network 17 when operating in the operational system. Further, when operating in a standby system, line processing of packet data communicated with the second supervisory control device 16 of the manned station 14 via the packet communication network 17 is performed. The line processing unit 34 includes a PAD (Packet Assembly Disassembly).

  The maintenance line processing unit 36 performs line processing of data exchanged with the maintenance console 21 connected directly. The individual input / output processing unit 37 performs line processing of individual input / output data exchanged with the first monitored device via the network. The inter-system processing unit 38 performs line processing of data exchanged with the second monitoring control device 13 that is connected via the transmission path 19 and operates in the other system of the same station.

  The ROM 28 stores program data. The first and second memories 29 and 30 are rewritable nonvolatile memories and store setting information tables (table data) describing setting information for use in the program or the like. The table data stored in these memories 29 and 30 is the same data.

  The access control unit 39 is individually connected to the first and second memories 29 and 30, and performs control to switch which of the first and second memories 29 and 30 is accessed.

  The control unit 31 normally controls the access control unit 39 to access one of the memories for operation. When an abnormality occurs in the memory accessed for operation, the other (standby) The access control unit 39 is controlled to switch the access to the memory. Further, the control unit 31 controls the access control unit 39 to access the standby memory when a table data rewrite request is instructed.

  By duplicating the table data in this way, even if an abnormality occurs in the table data for operation, recovery can be easily performed by switching back to the table data for standby. Further, maintenance such as rewriting of table data can be performed without stopping the operation of the supervisory control device by performing maintenance on the standby table data that is not used at that time.

  It should be noted that only one rewritable non-volatile memory is provided, the area of this memory is divided into two, the same table data is stored in both areas, the stored table data is used in one area, and the other A configuration may be adopted in which the table data stored in the area is read for standby.

  Next, the operation of the above configuration will be briefly described. When the first supervisory control device 15 of the manned station 14 is operating as the active system and the second supervisory control device 16 is operating as the standby system, the first supervisory control device 12 of the unmanned station 11 is used as the active system. 2 The monitoring control device 13 operates as a standby system.

  The first monitoring control devices 12 and 15 operating in the operational system perform data communication of monitoring information using the first packet communication network 17. Then, the second monitoring control devices 13 and 16 operating in the standby system use the second packet communication network 18 for data communication of monitoring information.

For example, as shown in FIG. 3, the second monitoring control device 13 operating in the standby system of the unmanned station 11 constantly monitors the first monitoring control device 12 operating in the operation system (S-1). When the status determination unit 32 of the standby second monitoring control device 13 detects that an abnormality or failure has occurred in the active first monitoring control device 12 ("Y" side in S-2), the second packet The system switching information is transmitted to the second monitoring control device 15 operating in the standby system of the manned station 14 via the communication network 18 (S-3). In addition, the control data to be operated in the standby system is transmitted to the active first monitoring control device 12 via the inter-system processing unit 38 (S-4). After that, the control unit 31 of the standby second monitoring control device 13 operates as an active system (S-5). Note that the above-described procedure “S-3” may be performed after the procedure “S-4”.
Thereby, in the unmanned station 11, the second monitoring control device (monitoring control device that operates in the original standby system) 13 newly operates as the active system.
On the other hand, the second monitoring control device 16 operating in the standby system of the manned station 14 operates in the standby system in response to receiving the system switching information from the second monitoring control device 13 of the unmanned station 11 (S-6). Control data to be sent to the first monitoring control device 15 operating in the operating system of the same station (S-4), and thereafter operating itself as the operating system (S-5).

  At the time of system switching, the monitoring control device that newly operates in the active system (the monitoring control device that operates in the original standby system) has the original operation information such as individual I / O data monitoring information such as device status information before the failure occurred. Since the data is acquired in synchronization with the monitoring control device operating in the system, the monitoring operation can be continued without affecting the monitoring.

  Next, FIG. 4 shows a procedure for performing maintenance for changing the table data of the monitoring control devices 12 and 13 of the unmanned station 11. The maintenance console 21 is connected to the maintenance line processing unit 36 of the second monitoring control device 16 operating in the standby system of the manned station 14 (S-7). Then, using the second packet communication network 18 used by the monitoring control device operating for standby, the second memory 30 stored in the standby second monitoring control device 13 of the standby system of the unmanned station 11 is stored. An instruction to rewrite table data to new table data is issued from the maintenance console 21 (S-8).

  After rewriting the table data in the second memory to a new one, the access is switched to the memories 29 and 30 of the second supervisory control device 13 of the unmanned station 11, and the second is originally for standby. The memory 30 is switched to operation. Then, the first memory 29 that is originally used for operation is switched to standby (S-9).

  After that, as described above, the maintenance console 21 gives an instruction to rewrite the table data stored in the first memory 29 switched to stand-by to new table data (S-10). Thereby, the maintenance work for the standby supervisory control device 13 of the unmanned station 11 is completed.

Next, in response to an instruction from the maintenance console 21, the system of the unmanned station 11 is switched, the second monitoring control device 13 of the standby system that has completed the maintenance work is set as the active system, and the first monitoring in which the maintenance work is unprocessed. The control device 12 is operated as a standby system (S-11). Thereby, the system switching is also performed in synchronism with the manned station 14 side. The monitoring control devices 13 and 16 switched to the active system use the first packet communication network 17, and the monitoring control devices 12 and 15 switched to the standby system use the second packet communication network 18 to perform data communication. I do.
After the system switching is completed, the maintenance console 21 is reconnected to the first supervisory control device 15 of the manned station 14 switched from the active system to the standby system (S-12).

  Thereafter, the first monitoring control of the unmanned station 11 switched to the standby system is instructed from the maintenance console 21 using the first packet communication network 17 to the first monitoring control device 15 switched to the standby system. Maintenance is performed on the device 12 by the same operation as described above. That is, a request for rewriting the table data stored in the standby second memory 30 of the first monitoring control device 12 that has been switched to the standby system to a new one is instructed (S-13). The access switching of the second memories 29 and 30 is performed (S-14), and a request to rewrite the table data of the first memory 29 switched to the standby mode to new table data is instructed (S-15). Thereby, the setting information can be changed without stopping the monitoring operation for all of the monitoring control devices 12 and 13 of the unmanned station 11.

  Note that the present invention is not limited to the above-described embodiments, and can be embodied by modifying the components without departing from the scope of the invention in the implementation stage. Further, various inventions can be formed by appropriately combining a plurality of constituent elements disclosed in the above embodiments. For example, some components may be deleted from the overall components shown in the embodiment.

DESCRIPTION OF SYMBOLS 10 Monitoring system 11 Unmanned station 12 1st monitoring control apparatus 13 2nd monitoring control apparatus 14 Manned station 15 1st monitoring control apparatus 16 2nd monitoring control apparatus 17 1st packet communication network 18 2nd packet communication network

Claims (6)

Monitoring control of a duplex structure provided in an unmanned station that acquires monitoring information from a first monitored device and monitors the first monitored device, and operates either as an active system and the other as a standby system Equipment,
Provided in a manned station, acquires monitoring information of the first monitored device from a monitoring control device provided in the unmanned station, monitors the first monitored device, and sets one of them as an operating system, and the other A supervisory control device with a dual structure that operates as a standby system;
A first packet communication network in which the monitoring control devices operating in the operational system provided in the unmanned station and the manned station communicate the monitoring information of the first monitored device ;
A second packet communication network in which the monitoring control devices operating in a standby system provided in the unmanned station and the manned station communicate the monitoring information of the first monitored device ;
Connected to the supervisory control device operating in the standby system provided in the manned station, and provided in the supervisory control device and the unmanned station using only the second packet communication network of the first and second packet communication networks. a maintenance terminal for communicating with maintenance information between the monitoring and control device operating in standby and,
A monitoring system characterized by comprising: Monitoring system according to claim 1 wherein the monitoring and control device which operates in the standby system, characterized in that it comprises means for discarding the monitoring information received via the second packet communication network. The monitoring and control apparatus operating in the standby system monitors the monitoring and control apparatus operating in the active system of the same station, and determines that the monitoring control apparatus operating in the active system of the same station is abnormal, the monitoring operating in the active system Performs system switching from the control device to the standby system and from itself to the active system,
Monitoring system according to claim 1 or 2 in response to the system switching of the monitoring control apparatus that operates in the remote station of the standby system, to perform the system switching in the department, characterized in that. The monitoring control apparatus includes first and second storage units that store the same setting information, and an access control unit that performs control to switch access to one of the storage units for operation and the other to standby. And
In response to an instruction to rewrite the new setting information from the maintenance terminal, the access control unit permits rewriting of the setting information stored in the standby storage unit, and then newly After the process of switching the rewritten standby storage unit to the operation and the operation storage unit to the standby, the setting information stored in the switched standby storage unit can be rewritten again. To
The monitoring system according to any one of claims 1 to 3 , wherein: Monitoring control of a duplex structure provided in an unmanned station that acquires monitoring information from a first monitored device and monitors the first monitored device, and operates either as an active system and the other as a standby system The monitoring information of the first monitored device is acquired from the monitoring control device provided in the unmanned station, and the first monitored device is monitored, and one of them is an operational system. As for the dual-structured monitoring control device that operates as the other standby system, the monitoring control devices that operate as the operation system provided in the unmanned station and the manned station, and the monitoring control devices that operate as the standby system individually in the second packet communication network standby first packet communication network operating system uses to communicate monitor information of said first monitored device uses to communicate monitor information of said first monitored device Connected monitoring system In the maintenance method,
Connect the maintenance terminal to the monitoring control apparatus that operates in a standby provided in the manned station, using the maintenance terminal, only the second packet communication network among the first and second packet communication network A maintenance method for a monitoring system, characterized in that maintenance information is communicated with a monitoring control device operating in a standby system provided in an unmanned station. The monitoring control apparatus includes a first storage unit and a second storage unit that store the same setting information, and an access control unit that performs control to switch access to one of the storage units for operation and the other to standby. Has
The maintenance terminal instructs the standby storage unit to rewrite new setting information during maintenance, and then sets the operation storage unit for standby and the standby storage unit for operation. Instruct each request to switch, and finally instruct a new setting information rewrite request to the switched standby storage unit,
The maintenance method of the monitoring system according to claim 5 , wherein:

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