JP2014199482A - Plant monitoring and control system, control device thereof, and plant monitoring and control method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To continue to monitor a plant with reduced power consumption when abnormality occurs.SOLUTION: In a control device 3, power source devices 15a and 15b convert supply voltages supplied from power supply systems 19a and 19b into set voltages respectively. While the set voltages are supplied, a plurality of monitoring and control devices receive an input signal 9 outputted from a field unit 12 via a transmitter 11 to transmit it to a remote operation unit 1 as a plant monitoring signal 2b and output a plant operation signal 2a from the remote operation unit 2 to the field unit 12 as output data 10. An abnormality function degenerate mode changeover instructor 21 monitors the power source devices 15a and 15b and, in a normal state, supplies the set voltages to the plurality of monitoring and control devices. In an abnormal state, the instructor 21 supplies the set voltages to set monitoring and control devices minimally required for plant monitoring and control out of the plurality of monitoring and control devices if one of the power source devices 15a and 15b is not capable of output.

Description

  Embodiments described herein relate generally to a plant monitoring control system for monitoring and controlling a plant, a control device for the system, and a plant monitoring control method.

  A plant monitoring and control system that monitors and controls a plant from a remote location has been developed (for example, Patent Document 1). In recent years, a power supply configuration multiplexed has been developed in preparation for an abnormality such as an earthquake disaster.

  FIG. 13 is a block diagram showing a configuration of a plant monitoring control system in which power supply configurations are multiplexed as a conventional plant monitoring control system.

  A conventional plant monitoring and control system includes a remote control unit 1, a control device 3, a transmitter 11, a field unit 12, two multiplexed distribution boards 13a and 13b, a transmitter power supply source 17, and a multiplexing unit. Power supply systems 19a and 19b and two emergency power supplies 30a and 30b multiplexed.

  The remote operation unit 1 is provided at a remote location with respect to the control device 3 and is connected to the control device 3 via a network. The remote operation unit 1 transmits a plant operation signal 2a for controlling the plant to the control device 3 via the network.

  The field unit 12 is a peripheral device of the plant, and examples of the peripheral device include sensors and devices provided in the plant. The transmitter power supply 17 supplies a voltage to the transmitter 11.

  Distribution boards 13a and 13b are connected to power systems 19a and 19b, respectively. The power supply systems 19a and 19b supply a supply voltage. Furthermore, emergency power supplies 30a and 30b are connected to the power supply systems 19a and 19b, respectively, in preparation for an unexpected situation when an abnormality occurs.

  The control device 3 controls the plant based on the plant operation signal 2a from the remote operation unit 1, and transmits a plant monitoring signal 2b representing the monitoring result of the plant to the remote operation unit 1 via the network. The control device 3 includes two multiplexed control units 4a and 4b, input units 5-1 to 5-n (n is an integer of 2 or more), output units 6-1 to 6-n, relays Units 7-1 to 7-n, other devices 8-1 to 8-n, two multiplexed power supply monitors 14a and 14b, two multiplexed power supply devices 15a and 15b, And an output device 18.

  The inputs of the power supply devices 15a and 15b are connected to the distribution boards 13a and 13b via the power supply monitors 14a and 14b, respectively. Power supply devices 15a and 15b convert supply voltages supplied from power supply systems 19a and 19b through distribution boards 13a and 13b, respectively, to set voltages. Power supply devices 15a and 15b include control units 4a and 4b, input units 5-1 to 5-n, output units 6-1 to 6-n, relay units 7-1 to 7-n, and other devices. A set voltage is supplied to the power source lines 16 to 8-1 to 8-n.

  The input units 5-1 to 5-n receive the input signal 9 output from the field unit 12 via the transmitter 11 when the set voltage is supplied.

  The control units 4a and 4b transmit the input signal 9 from the input units 5-1 to 5-n as the plant monitoring signal 2b to the remote operation unit 1 via the network, and the plant operation signal 2a from the remote operation unit 1 is transmitted. The output data 10 is output to the field unit 12 via the output units 6-1 to 6-n.

  The remote control unit 1 includes a display 51. The display 51 displays the monitoring result represented by the plant monitoring signal 2b.

  Thus, in the conventional plant monitoring and control system, the supply voltage is supplied from the power supply systems 19a and 19b to the control device 3 via the distribution boards 13a and 13b, respectively. For this reason, even if an earthquake or the like occurs and the voltage supply of either of the power supply systems 19a and 19b becomes impossible, since the power supply configuration is multiplexed, the control device 3 continues to monitor and control the plant. be able to.

Japanese Utility Model Publication No. 01-079103

  However, when the voltage supply of either of the power supply systems 19a and 19b becomes impossible when an abnormality occurs, there is a possibility of power shortage. In the event of power shortage, the control device 3 may not be able to continue monitoring and controlling the plant, but even in that case, in order to grasp the current situation, it is desired to continue monitoring the plant only until the power is restored There is a request.

  Here, the distribution board 13a receives an AC voltage as a supply voltage, and the distribution board 13b receives an uninterruptible power supply or a battery voltage as a supply voltage, so that at least one power supply system has an uninterruptible power supply or a battery. It can also be made to be supplied from. However, when an earthquake or the like occurs, the power supply from the uninterruptible power supply or the battery to the distribution board 13b stops, and the control device 3 may not be able to continue monitoring the plant.

  The emergency power supplies 30a and 30b are prepared in preparation for an unexpected situation at the time of occurrence of an abnormality, but there is a possibility that they cannot be used due to the influence of an earthquake disaster or the like. Thus, the present condition is that the countermeasure which assumed the time of abnormality is not taken.

  Therefore, the problem to be solved by the present embodiment is to continue monitoring the plant while suppressing power consumption when an abnormality occurs.

  The plant monitoring control system of the embodiment is connected to the remote operation unit via a network and a remote operation unit that transmits a plant operation signal for controlling the plant, and is based on the plant operation signal from the remote operation unit A plant monitoring control system comprising: a control device for controlling a plant and transmitting a plant monitoring signal representing a monitoring result of the plant to the remote control unit via the network, the control device comprising: A plurality of multiplexed power supply devices that respectively convert supply voltages supplied from the system into set voltages, and an input signal output from a field unit that is a peripheral device of the plant when the set voltages are supplied Is input to the remote operation unit via the network as the plant monitoring signal, and the remote operation unit A plurality of supervisory control devices that output the plant operation signal as output data to the field unit, and the plurality of power supply devices are monitored, and the set voltage is supplied to the plurality of supervisory control devices in a normal state. When at least one power supply device among the plurality of power supply devices is unable to output in the event of an abnormality, a setting monitoring control device that is a preselected monitoring control device among the plurality of monitoring control devices And an abnormal function degeneration mode switching command device for supplying the set voltage.

  The control device of the plant monitoring control system of the embodiment is connected to a remote operation unit that transmits a plant operation signal for controlling the plant via a network, and controls the plant based on the plant operation signal from the remote operation unit. A control device for a plant monitoring control system that controls and transmits a plant monitoring signal representing a monitoring result of the plant to the remote control unit via the network, wherein a supply voltage supplied from a power supply system is set to a set voltage, respectively. A plurality of multiplexed power supply devices for conversion, and when the set voltage is supplied, an input signal output from a field unit which is a peripheral device of the plant is input and the remote operation is performed as the plant monitoring signal The plant operation signal from the remote control unit to output data. A plurality of supervisory control devices that output to the field section and the plurality of power supply devices, supply the set voltage to the plurality of monitor control devices during normal operation, and the plurality of power supply devices during abnormal operation A function for supplying the set voltage to a setting monitoring control device that is a preselected monitoring control device among the plurality of monitoring control devices when at least one of the power supply devices cannot output And a degeneration mode switching command device.

  According to the plant monitoring control method of the embodiment, a control device connected via a network to a remote operation unit that transmits a plant operation signal for controlling a plant is based on the plant operation signal from the remote operation unit. And a plant monitoring control method for transmitting a plant monitoring signal representing a monitoring result of the plant to the remote control unit via the network, wherein a plurality of multiplexed power supply devices are supplied from a power supply system. Converting each supply voltage into a set voltage, monitoring the plurality of power supply devices, supplying the set voltage to a plurality of monitoring control devices in a normal state, and the plurality of monitoring control devices When the set voltage is supplied, the plurality of monitoring control devices output from the field unit which is a peripheral device of the plant. An input signal to be input and transmitted to the remote operation unit as the plant monitoring signal via the network, and outputting the plant operation signal from the remote operation unit to the field unit as output data; In the case where at least one power supply device among the plurality of power supply devices is unable to output, the setting voltage is applied to the setting monitoring control device which is a preselected monitoring control device among the plurality of monitoring control devices. And a step of supplying the material.

  According to the embodiment of the present invention, it is possible to continue monitoring the plant while suppressing power consumption when an abnormality occurs.

It is a block diagram which shows the structure of the plant monitoring control system which concerns on 1st Embodiment. In the plant supervisory control system concerning a 1st embodiment, it is a block diagram showing composition of a plurality of supervisory control equipment by multiplexing. The plant monitoring control system which concerns on 1st Embodiment has shown the information memorize | stored in the memory | storage part of the function degeneracy mode switching command device at the time of abnormality of a control apparatus. It is a flowchart which shows operation | movement of the plant monitoring control system which concerns on 1st Embodiment. It is a flowchart which shows the monitoring control process of FIG.4 S5 as operation | movement of the plant monitoring control system which concerns on 1st Embodiment. It is a block diagram which shows the structure of the plant monitoring control system which concerns on 2nd Embodiment. In the plant monitoring control system concerning a 2nd embodiment, the information memorized by the storage part of the function degeneration mode change command switch at the time of abnormalities of a control device is shown. It is a flowchart which shows the monitoring control process of FIG.4 S5 as operation | movement of the plant monitoring control system which concerns on 2nd Embodiment. It is a block diagram which shows the structure of the plant monitoring control system which concerns on 3rd Embodiment. It is a flowchart which shows the process of FIG.8 S23 as operation | movement of the plant monitoring control system which concerns on 3rd Embodiment. It is a block diagram which shows the structure of the plant monitoring control system which concerns on 4th Embodiment. It is a flowchart which shows the process of FIG.8 S23 as operation | movement of the plant monitoring control system which concerns on 4th Embodiment. It is a block diagram which shows the structure of the conventional plant monitoring control system.

  Hereinafter, an embodiment of a plant monitoring control system according to the present invention will be described with reference to the drawings. Here, parts that are the same or similar to those of the conventional plant monitoring and control system are denoted by common reference numerals, and redundant description is omitted.

[First Embodiment]
(Constitution)
FIG. 1 is a block diagram showing a configuration of a plant monitoring control system according to the first embodiment.

  The remote operation unit 1 of the plant monitoring control system according to the first embodiment further includes an abnormal function degenerate mode setting device 20 as compared with the remote operation unit 1 of the conventional plant monitoring control system.

  The control device 3 of the plant monitoring and control system according to the first embodiment is different from the control device 3 of the conventional plant monitoring and control system in that an abnormal function degeneration mode switching command device 21 and a control device power supply switching device 25-1. 25-2, input / output device supply power switch 26, input / output signal switch 27, relay unit supply power switch 28-1 to 28-n, and other device supply power switch 29-1 to 29-2. 29-n.

  Control device power supply switchers 25-1 and 25-2 have switches provided between power supply line 16 connected to the outputs of power supply devices 15a and 15b and control units 4a and 4b, respectively. . The input / output device supply power switch 26 includes a plurality of switches provided between the power line 16 and the input units 5-1 to 5-n and the output units 6-1 to 6-n. The input / output signal switch 27 is provided between a plurality of switches provided between the input units 5-1 to 5-n and the transmitter 11, and between the output units 6-1 to 6-n and the field unit 12. A plurality of switches.

  The relay part power supply switching devices 28-1 to 28-n have switches provided between the power line 16 and the relay parts 7-1 to 7-n. The other device power supply switching units 29-1 to 29-n have switches provided between the power supply line 16 and the other devices 8-1 to 8-n.

  The abnormal function degeneration mode switching command device 21 sends an abnormal function degeneration mode command signal 23 to the control device supply power switch 25-1 and 25-2, the input / output device supply power switch 26, and the input / output signal switch 27. It outputs to the relay part power supply switching devices 28-1 to 28-n and the other device power supply switching devices 29-1 to 29-n. Control device supply power switch 25-1 and 25-2, input / output device supply power switch 26, input / output signal switch 27, relay unit supply power switch 28-1 to 28-n, and other device supply power switch Each switch with the devices 29-1 to 29-n is turned on, for example, when the value of the abnormal function degeneration mode command signal 23 is "0", and the value of the abnormal function degeneration mode command signal 23 is "1". Turns off if "".

  In the plant monitoring control system according to the first embodiment, a plurality of monitoring control devices 80-1a to 80-na and 80-1b to 80-nb are configured by multiplexing the control units 4a and 4b. The

  FIG. 2 is a block diagram illustrating a configuration of the monitoring control devices 80-1a to 80-na and 80-1b to 80-nb in the plant monitoring control system according to the first embodiment.

  The input units 5-1 to 5-n, the output units 6-1 to 6-n, the relay units 7-1 to 7-n, and the other devices 8-1 to 8-n are distributed into two groups. .

  For example, as a group including the control unit 4a, the control unit 4a, the input unit 5-1, the output unit 6-1, the relay unit 7-1, and the other device 8-1 constitute the monitoring control device 80-1a. The control unit 4a, the input unit 5-n, the output unit 6-n, the relay unit 7-n, and the other devices 8-n constitute a monitoring control device 80-na. In addition, as a group including the control unit 4b, the control unit 4b, the input unit 5-1, the output unit 6-1, the relay unit 7-1, and the other device 8-1 constitute the monitoring control device 80-1b. The control unit 4b, the input unit 5-n, the output unit 6-n, the relay unit 7-n, and the other devices 8-n constitute a monitoring control device 80-nb.

  In the plant monitoring control system according to the first embodiment, the abnormal function degenerate mode switching command device 21 of the control device 3 includes a storage unit 81. FIG. 3 shows information stored in the storage unit 81 in the plant monitoring control system according to the first embodiment. The storage unit 81 stores information representing the monitoring control devices 80-1a to 80-na and 80-1b to 80-nb.

  In the plant monitoring and control system according to the first embodiment, when one of the power supply devices 15a and 15b cannot output, the monitoring control device 80- is the minimum required device for monitoring and controlling the plant. Functions are degenerated from 1a to 80-na and 80-1b to 80-nb to a setting monitoring control device described later.

(Function)
FIG. 4 is a flowchart showing the operation of the plant monitoring control system according to the first embodiment.

  First, the setting monitoring control device 80-1a among the monitoring control devices 80-1a to 80-na and 80-1b to 80-nb is selected in advance by the worker. The setting monitoring control device 80-1a is a monitoring and control device that is at least necessary for monitoring and controlling the plant when one of the power supply devices 15a and 15b cannot output. The abnormal function degeneration mode setting device 20 of the remote control unit 1 transmits an abnormal function degeneration mode setting signal 22 for designating the setting monitoring control device 80-1a to the control device 3 via the network (step). S1).

  When the abnormal function degeneration mode switching command unit 21 of the control device 3 receives the abnormal function degeneration mode setting signal 22 transmitted from the abnormal function degeneration mode setter 20 (step S2-YES), the monitoring control device Corresponding to the information representing 80-1a, the abnormal function degeneration mode setting signal 22 is stored in the storage unit 81 (step S4).

  Specifically, in step S4, information indicating “valid” for the monitoring control device 80-1a is used as information for designating the monitoring control device 80-1a by the abnormal function degeneration mode setting signal 22. Information indicating “invalid” is stored in the storage unit 81 and stored in the storage unit 81 for the other monitoring control devices 80-2a to 80-na and 80-1b to 80-nb (see FIG. 3). .

  In the present embodiment, the setting monitoring control device 80-1a is specified by the abnormal function degeneration mode setting signal 22 from the remote operation unit 1, but the setting monitoring control device 80-1a is specified by the control device 3 itself. May be. In this case, the abnormal function degeneration mode switching command device 21 of the control device 3 inputs the above-described abnormal function degeneration mode setting signal 22 by the operator's operation (step S3-YES), and the monitoring control device 80-1a. Is stored in the storage unit 81 in association with the information representing the function degeneration mode setting signal 22 at the time of abnormality (step S4).

  The remote operation unit 1 transmits a plant operation signal 2a for controlling the plant to the control device 3 via the network. At this time, the control device 3 controls the plant based on the plant operation signal 2a from the remote operation unit 1, and transmits a plant monitoring signal 2b representing the monitoring result of the plant to the remote operation unit 1 via the network ( Step S5: monitoring control process). The display 51 of the remote control unit 1 displays the monitoring result represented by the plant monitoring signal 2b (step S6).

  FIG. 5 is a flowchart showing the monitoring control process in step S5 of FIG. 4 as the operation of the plant monitoring control system according to the first embodiment.

  The abnormal function degeneration mode switching command device 21 of the control device 3 monitors the power supply devices 15a and 15b (step S11).

  Specifically, in step S11, the power supply monitors 14a and 14b monitor the supply voltages supplied from the power supply systems 19a and 19b to the inputs of the power supply devices 15a and 15b via the distribution boards 13a and 13b, respectively. And output as a power supply monitoring signal 24. For example, when the supply voltage is supplied to both the power supply devices 15a and 15b, the value of the power supply monitoring signal 24 is “11”, and when the supply voltage is supplied only to the power supply device 15a, the value of the power supply monitoring signal 24 is “10”. When the supply voltage is supplied only to the power supply device 15b, the value of the power supply monitoring signal 24 is “01”. When the supply voltage is not supplied to both the power supply devices 15a and 15b, the value of the power supply monitoring signal 24 is “00”. To do.

  Here, the case where the value of the power monitoring signal 24 is “11”, that is, the case where both the power supply devices 15a and 15b can output is referred to as normal time, and the other case is referred to as abnormal time.

  When it is normal (step S12-YES), the function degeneration mode switching command device 21 of the control device 3 for the abnormality is in response to the monitoring control devices 80-1a to 80-na and 80-1b to 80-nb. A set voltage output from the power supply devices 15a and 15b is supplied (step S13).

  Specifically, in step S13, the abnormal function degeneration mode switching command unit 21 sends the abnormal function degeneration mode command signal 23 to the control device supply power switch units 25-1 and 25-2 and the input / output device supply power switch unit. 26, I / O signal switching device 27, relay unit power supply switching devices 28-1 to 28-n, and other device power supply switching devices 29-1 to 29-n. The value of the signal 23 is set to “0”. In this case, each of these switches is turned on according to the value “0” of the abnormal function degeneration mode command signal 23.

  In step S13, the monitoring control devices 80-1a to 80-na and 80-1b to 80-nb are input from the field unit 12 via the transmitter 11 when the set voltage is supplied. The signal 9 is input, the input signal 9 is transmitted as a plant monitoring signal 2b to the remote operation unit 1 via the network, and the plant operation signal 2a from the remote operation unit 1 is output to the field unit 12 as output data 10. .

  On the other hand, when there is an abnormality (step S12-NO) and the value of the power supply monitoring signal 24 is “10” or “01”, that is, one of the power supply devices 15a and 15b, for example, the power supply device 15b. Is not output (step S14), the abnormal function degenerate mode switching command device 21 of the control device 3 is based on the abnormal function degenerate mode setting signal 22 stored in the storage unit 81, and the monitoring control device 80 The setting monitoring control device 80-1a is selected from -1a to 80-na and 80-1b to 80-nb.

  In this case, the abnormal function degeneration mode switching command unit 21 of the control device 3 sets and monitors the monitoring control devices 80-1a to 80-na and 80-1b to 80-nb in order to suppress power consumption. The set voltage output from the power supply device 15a is supplied to the control device 80-1a (step S15).

  Specifically, in step S15, the abnormal function degenerate mode switching command unit 21 designates the switch of the control device power supply switch 25-2 and the input / output device power supply as designation of the setting monitoring control device 80-1a. Switches connected to the input units 5-2 to 5-n and the output units 6-2 to 6-n of the switch 26, and the input units 5-2 to 5-n and the output unit 6 of the input / output signal switch 27 Output to the switches connected to -2 to 6-n, the switches of the relay unit power supply switching devices 28-2 to 28-n, and the switches of the other device power supply switching devices 29-2 to 29-n The value of the function degeneration mode command signal 23 at the time of abnormality is set to “1”. In this case, each of these switches is turned off in accordance with the value “1” of the abnormal function degeneration mode command signal 23.

  In step S15, the setting monitoring control device 80-1a receives the input signal 9 output from the field unit 12 via the transmitter 11 when the setting voltage is supplied, and the input signal 9 Is transmitted as a plant monitoring signal 2b to the remote operation unit 1 via the network, and the plant operation signal 2a from the remote operation unit 1 is output to the field unit 12 as output data 10.

  As a result of monitoring the power supply devices 15a and 15b, if the power supply device 15b has not recovered and is still unable to output (step S16-NO), the abnormal function degeneration mode switching command unit 21 of the control device 3 continues step S15. When both the power supply devices 15a and 15b are restored and output is possible (step S16-YES), the steps after step S11 are executed.

(effect)
In the plant monitoring control system according to the first embodiment, the abnormal function degeneration mode setting unit 20 of the remote operation unit 1 or the abnormal function degeneration mode switching command unit 21 of the control device 3 is used as a degeneration point in advance for monitoring control. The power supply device 15b of the power supply devices 15a and 15b cannot be output by specifying the setting monitoring control device 80-1a among the devices 80-1a to 80-na and 80-1b to 80-nb. When the abnormality occurs, the abnormal function degeneration mode switching command device 21 automatically supplies voltage only to the minimum necessary equipment (setting monitoring control equipment 80-1a) for plant monitoring and control, The setting monitoring control device 80-1a inputs and outputs only the minimum signals necessary for monitoring and controlling the plant. For this reason, according to the plant monitoring control system concerning a 1st embodiment, monitoring and control of a plant can be continued, suppressing power consumption at the time of abnormal occurrence.

[Second Embodiment]
In the second embodiment, only the changes from the first embodiment will be described. Here, the parts other than the explanation part are the same as in the first embodiment.

(Constitution)
FIG. 6 is a block diagram showing a configuration of a plant monitoring control system according to the second embodiment.

  The plant monitoring control system according to the second embodiment further includes a transmitter power supply switching unit 53 with respect to the plant monitoring control system according to the first embodiment.

  The remote operation unit 1 of the plant monitoring control system according to the second embodiment further includes a remote operation unit built-in battery 50 with respect to the remote operation unit 1 in the first embodiment. The remote operation unit built-in battery 50 is charged with a charge corresponding to the set voltage, and supplies the set voltage by discharging when used in an abnormal state.

  The control device 3 of the plant monitoring control system according to the second embodiment further includes a built-in battery switch 52 and a control device built-in battery 54 with respect to the control device 3 in the first embodiment. The control device built-in battery 54 is charged with a charge corresponding to the set voltage, and supplies the set voltage by discharging when it is used in an abnormal state.

  The built-in battery switch 52 of the control device 3 has a switch. The switch includes a normal terminal 52a, an abnormal terminal 52b, and a common terminal 52c. The common terminal 52c includes power supply devices 15a and 15b, control device supply power switching units 25-1 and 25-2, and input / output device supply power switching. Is connected to the input side of the switch 26, the input / output signal switch 27, and the relay section power supply switch 28-1 to 28-n. The normal terminal 52a is connected to the output side of the power supply devices 15a and 15b, and the built-in battery switch 52 is connected to the normal terminal 52a and the common terminal 52c when the value of the abnormal function degeneration mode command signal 23 is “0”. And connect. The abnormality terminal 52b is connected to the output side of the control device built-in battery 54, and the built-in battery switch 52 is connected to the abnormality terminal 52b and the common terminal 52c when the value of the abnormal function degeneration mode command signal 23 is “1”. And connect.

  The transmitter power switch 53 has a switch. The switch includes a normal terminal 53 a, an abnormal terminal 53 b, and a common terminal 53 c, and the common terminal 53 c is connected to the transmitter 11. The normal terminal 53a is connected to the output side of the transmitter power supply source 17, and the transmitter power switch 53 is connected to the normal terminal 53a and the common terminal 53c when the value of the abnormal function degeneration mode command signal 23 is “0”. And connect. The abnormality terminal 53b is connected to the common terminal 52c of the built-in battery switching device 52, and the transmitter power supply switching device 53 is common to the abnormality terminal 53b when the value of the abnormal function degeneration mode command signal 23 is “1”. 53c is connected.

  In the plant monitoring control system according to the second embodiment, when both the power supply devices 15a and 15b are unable to output, the above-described setting monitoring control device 80-1a is described later as the minimum device necessary for plant monitoring. Degenerate the function to the setting monitoring dedicated device.

(Function)
Next, operation | movement of the plant monitoring control system which concerns on 2nd Embodiment is demonstrated using FIG. 4 and FIG. FIG. 4 is similar to the first embodiment, but the operation of the plant monitoring control system according to the second embodiment is slightly different from the operation of the plant monitoring control system according to the first embodiment. FIG. 7 shows information stored in the storage unit 81 of the abnormal function degeneration mode switching command device 21 of the control device 3 in the plant monitoring control system according to the second embodiment.

  First, in step S1, the above-described setting monitoring control device 80-1a among the monitoring control devices 80-1a to 80-na and 80-1b to 80-nb is selected in advance by an operator, and further, setting monitoring is performed. Of the control devices 80-1a, the setting monitoring dedicated device 80-1a ′ (see FIG. 7) is selected in advance by the worker. As described above, the setting monitoring control device 80-1a is a monitoring control device that is the minimum necessary for monitoring and controlling the plant when one of the power supply devices 15a and 15b cannot output. is there. On the other hand, the setting monitoring dedicated device 80-1a 'is a monitoring dedicated device necessary for monitoring the plant when both the power supply devices 15a and 15b cannot output. The abnormal function degeneration mode setting device 20 of the remote control unit 1 sends an abnormal function degeneration mode setting signal 22 for specifying the setting monitoring control device 80-1a and the setting monitoring dedicated device 80-1a ′ in advance to the control device 3. Over the network.

  Next, in step S <b> 4, the abnormal function degeneration mode switching command unit 21 of the control device 3 stores the abnormal function degeneration mode setting signal 22 in the storage unit 81 in association with information representing the monitoring control device 80-1 a. To do.

  Specifically, in step S4, information indicating “valid” for the monitoring control device 80-1a as information for preliminarily designating the monitoring control device 80-1a by the abnormal function degeneration mode setting signal 22 Is stored in the storage unit 81, and information indicating “invalid” is stored in the storage unit 81 for the other monitoring control devices 80-2a to 80-na and 80-1b to 80-nb. Further, as information for preliminarily specifying the setting monitoring dedicated device 80-1a ′ by the abnormal function degeneration mode setting signal 22, from the monitoring control device 80-1a, for example, an output unit 6-1, a relay unit 7-1, and Information for removing the other device 8-1 is stored in the storage unit 81 (see FIG. 7).

  Thereafter, step S5 (monitoring control process) and step S6 described above are executed.

  FIG. 8 is a flowchart showing the monitoring control process in step S5 of FIG. 4 as the operation of the plant monitoring control system according to the second embodiment.

  First, step S11 described above is executed.

  If it is normal (step S12—YES), step S13 described above is executed.

  Here, in step S13, the function degeneration mode switching command device 21 at the time of abnormality includes the control device power supply switching devices 25-1 and 25-2, the input / output device power supply switching device 26, the input / output signal switching device 27, and the relay unit. In addition to the switches of the power supply switchers 28-1 to 28-n and the other device power supply switchers 29-1 to 29-n, the power is output to the built-in battery switcher 52 and the transmitter power supply switcher 53. The value of the function degeneration mode command signal 23 at the time of abnormality is set to “0”. In this case, the built-in battery switch 52 connects the normal terminal 52a and the common terminal 52c according to the value “0” of the abnormal function degeneration mode command signal 23, and the transmitter power supply switch 53 transmits the abnormal function degeneration mode command. In accordance with the value “0” of the signal 23, the normal terminal 53a and the common terminal 53c are connected.

  On the other hand, when there is an abnormality (step S12-NO) and the value of the power supply monitoring signal 24 is “10” or “01”, that is, one of the power supply devices 15a and 15b, for example, the power supply device 15b. Cannot be output (step S21-YES), the above-described steps S15 and S16 are executed.

  Further, when an abnormality occurs (step S12-NO) and the value of the power monitoring signal 24 is “00”, that is, when both the power supply devices 15a and 15b cannot be output (steps S21-NO, S22). The abnormal function degeneration mode switching command device 21 of the control device 3 is based on the abnormal function degeneration mode setting signal 22 stored in the storage unit 81, and the setting monitoring dedicated device is selected from the setting monitoring control devices 80-1a. Select 80-1a ′.

  In this case, the function degeneration mode switching command unit 21 at the time of abnormality of the control device 3 includes the setting monitoring control device 80-1a in order to further suppress the power consumption as compared with the case where one power supply device cannot output. A setting voltage is supplied from the control device built-in battery 54 to the setting monitoring dedicated device 80-1a ′ (step S23).

  Specifically, in step S23, the abnormal function degeneration mode switching command unit 21 further inputs / outputs the designation of the setting monitoring control device 80-1a ′ as the designation of the setting monitoring dedicated device 80-1a ′. When an abnormality is output to the switch connected to the output unit 6-1 of the device supply power switch 26, the switch of the relay unit power supply switch 28-1, and the switch of the other device supply power switch 29-1. The value of the function degeneration mode command signal 23 is set to “1”. In this case, each of these switches is turned off in accordance with the value “1” of the abnormal function degeneration mode command signal 23.

  Further, in step S23, the abnormal function degeneration mode switching command unit 21 sets the value of the abnormal function degeneration mode command signal 23 to be output to the built-in battery switch 52 and the transmitter power switch 53 to “1”. In this case, the built-in battery switch 52 releases the connection between the normal terminal 52a and the common terminal 52c in response to the value “1” of the abnormal function degeneration mode command signal 23, and the abnormal terminal 52b and the common terminal 52c. And connect. The transmitter power switch 53 releases the connection between the normal terminal 53a and the common terminal 53c and connects the abnormal terminal 53b and the common terminal 53c in response to the value “1” of the abnormal function degeneration mode command signal 23. To do.

  In step S23, the setting monitoring dedicated device 80-1a ′ inputs the input signal 9 output from the field unit 12 via the transmitter 11 when the setting voltage is supplied, and the input signal 9 is abnormal. It is transmitted as a plant monitoring signal 55 to the remote control unit 1 via the network. An abnormal time plant monitoring signal 55 is the aforementioned plant monitoring signal 2b at the time of abnormality.

  As a result of monitoring the power supply devices 15a and 15b, the abnormal function degenerate mode switching command unit 21 of the control device 3 is unable to output even if both the power supply devices 15a and 15b are not recovered (step S24-NO), step If S23 is continued and both the power supply devices 15a and 15b are restored and can be output (step S24-YES), step S11 and subsequent steps are executed.

  Further, in step S6, the display 51 of the remote operation unit 1 displays the monitoring result represented by the plant monitoring signal 55 at the time of abnormality, but when there is no voltage supply for displaying the monitoring result at the time of abnormality, the remote operation unit The monitoring result is displayed by the set voltage supplied from the built-in battery 50.

(effect)
In the plant monitoring and control system according to the second embodiment, the abnormal function degeneration mode setting unit 20 of the remote operation unit 1 or the abnormal function degeneration mode switching command unit 21 of the control device 3 is used as a degeneration point in advance for monitoring control. Device 80-1a among the devices 80-1a to 80-na and 80-1b to 80-nb is designated, and the setting monitoring control device 80-1a is dedicated to setting monitoring. By designating the device 80-1a ′, when an abnormality occurs such that both the power supply devices 15a and 15b cannot output, the abnormal function degenerate mode switching command device 21 is automatically required for monitoring the plant. While supplying voltage only to the minimum equipment (setting monitoring dedicated equipment 80-1a '), the setting monitoring dedicated equipment 80-1a' inputs and outputs only the minimum signals necessary for plant monitoring. Cormorant. For this reason, according to the plant monitoring control system concerning a 2nd embodiment, monitoring of a plant can be continued, suppressing power consumption at the time of abnormal occurrence.

  Further, in the plant monitoring control system according to the second embodiment, when an abnormality occurs such that the power supply device 15b of the power supply devices 15a and 15b cannot output, the voltage supply to the setting monitoring dedicated device 80-1a ′ is Although it is performed from the control device built-in battery 54, since the dedicated setting monitoring device 80-1a 'inputs and outputs only the minimum signals necessary for monitoring the plant, the power consumption of the control device built-in battery 54 can be suppressed.

[Third Embodiment]
In the third embodiment, only changes from the second embodiment will be described. Here, the parts other than the explanation part are the same as in the second embodiment.

(Constitution)
FIG. 9 is a block diagram showing a configuration of a plant monitoring control system according to the third embodiment.

  The remote operation unit 1 of the plant monitoring control system according to the third embodiment further includes a movable abnormal plant monitoring unit 61 with respect to the remote operation unit 1 in the second embodiment. The movable type abnormal time plant monitoring unit 61 is removable from the remote operation unit 1 and includes the above-described remote operation unit built-in battery 50 and display 51 and has a network connection unit 60 that can be connected to a network. .

  The control device 3 of the plant monitoring control system according to the third embodiment is provided with an abnormal-time power line switching device 64 instead of the built-in battery switching device 52 with respect to the control device 3 in the second embodiment.

  The abnormal power line switch 64 of the control device 3 includes a switch and an abnormal plant monitoring unit connection confirmation sensor 63. The switch includes a normal terminal 64a, an abnormal terminal 64b, a common terminal 64c, and an abnormal terminal 64d. The common terminal 64c includes power supply devices 15a and 15b, control device supply power switchers 25-1, 25-2, and input. The output device supply power switch 26, the input / output signal switch 27, and the relay unit supply power switch 28-1 to 28-n are connected to the input side. The normal terminal 64a is connected to the output side of the power supply devices 15a and 15b, and the abnormal power line switch 64 is common to the normal terminal 64a when the value of the abnormal function degeneration mode command signal 23 is "0". The terminal 64c is connected.

  The abnormality terminal 64b is connected to the output side of the control device built-in battery 54. The abnormality power supply line switch 64 has an abnormality function degeneration mode command signal 23 of “1”, and the value of the switching signal described later is When it is “0”, the abnormality terminal 64b and the common terminal 64c are connected. The abnormality terminal 64d is connected to an abnormal power supply line 65 that connects the remote control unit built-in battery 50 of the remote operation unit 1 on the network and the control device 3, and the abnormal power line switch 64 operates in the abnormal function degeneration mode. When the value of the command signal 23 is “1”, the abnormality plant monitoring unit connection confirmation sensor 63 outputs a detection signal described later, and the value of the switching signal described later is “1” The terminal 64d and the common terminal 64c are connected.

  The abnormal plant monitoring unit connection confirmation sensor 63 is provided on the abnormal power supply line 65 in the abnormal power line switch 64 and monitors the abnormal power supply line 65.

  In the plant monitoring control system according to the third embodiment, both of the power supply devices 15a and 15b cannot output, and the setting voltage is supplied from the control device built-in battery 54 to the setting monitoring dedicated device 80-1a ′. When there is a limit to the continuous supply of the set voltage by the built-in battery 54, the control device built-in battery 54 is switched to the remote operation unit built-in battery 50 of the remote operation unit 1.

(Function)
Next, operation | movement of the plant monitoring control system which concerns on 3rd Embodiment is demonstrated using FIG. FIG. 8 is similar to the second embodiment, but the operation of the plant monitoring control system according to the third embodiment is slightly different from the operation of the plant monitoring control system according to the second embodiment.

  In step S13, the abnormal function degeneration mode switching command unit 21 replaces the built-in battery switch 52 in the second embodiment with the value of the abnormal function degeneration mode command signal 23 output to the abnormal power line switch 64. Set to “0”. In this case, the abnormal power line switch 64 connects the normal terminal 64a and the common terminal 64c in accordance with the value “0” of the abnormal function degeneration mode command signal 23.

  In step S23, the abnormal function degeneration mode switching command unit 21 replaces the built-in battery switch 52 in the second embodiment with the value of the abnormal function degeneration mode command signal 23 to be output to the abnormal power line switch 64. Set to “1”. Further, the function degeneration mode switching command unit 21 at the time of abnormality sets the value of the switching signal output to the power line switching unit 64 at the time of abnormality to “0”. In this case, the abnormal power line switch 64 connects the normal terminal 64a and the common terminal 64c according to the value “1” of the abnormal function degeneration mode command signal 23 and the value “0” of the switching signal. And the abnormality terminal 64b and the common terminal 64c are connected.

  FIG. 10 is a flowchart showing the process of step S23 of FIG. 8 as the operation of the plant monitoring control system according to the third embodiment.

  For example, it is assumed that the network connection unit 60 of the remote operation unit 1 is connected to the network after the occurrence of an abnormality. At this time, the abnormal plant monitoring unit connection confirmation sensor 63 in the abnormal power line switching unit 64 of the control device 3 monitors the abnormal power supply line 65, and as a result, the remote operation unit is built in the abnormal power supply line 65. When the set voltage supplied from the battery 50 is detected, a detection signal indicating that is output to the function degeneration mode switching command device 21 at the time of abnormality (step S31—YES).

  As described above, the abnormal function degenerate mode switching command unit 21 of the control device 3 controls the setting monitoring dedicated device 80-1a ′ when the two power supply devices 15a and 15b cannot be output at the time of abnormality. A set voltage is supplied from the built-in battery 54. Therefore, the abnormal function degeneration mode switching command device 21 counts until the setting monitoring dedicated device 80-1a ′ is supplied with the setting voltage from the control device built-in battery 54 until the continuous supply possible time of the control device built-in battery 54 is reached. To do. As a result, the abnormal function degenerate mode switching command device 21 receives the detection signal output from the abnormal time plant monitoring unit connection confirmation sensor 63, and when the continuous supply time of the control device built-in battery 54 has been reached, Instead of the device built-in battery 54, a set voltage is supplied from the remote control unit built-in battery 50 of the remote control unit 1 to the setting monitoring dedicated device 80-1a 'via a network (step S32).

  Specifically, in step S32, when the abnormal function degeneration mode switching command unit 21 reaches the continuous supply available time of the control device built-in battery 54, the value of the switching signal output to the power line switch unit 64 at the time of abnormality is set. Set to “1”. In this case, the abnormal power line switch 64 connects the abnormal terminal 64b and the common terminal 64c in accordance with the value “1” of the abnormal function degeneration mode command signal 23 and the value “1” of the switching signal. And the abnormality terminal 64d and the common terminal 64c are connected.

(effect)
In the plant monitoring control system according to the third embodiment, both of the power supply devices 15a and 15b cannot output, and the setting voltage is supplied from the control device built-in battery 54 to the setting monitoring dedicated device 80-1a ′. When there is a limit to the continuous supply of the set voltage by the built-in battery 54, the control device built-in battery 54 is switched to the remote operation unit built-in battery 50 of the remote operation unit 1. For this reason, according to the plant monitoring control system concerning a 3rd embodiment, monitoring of a plant can be continued, suppressing power consumption at the time of abnormal occurrence.

[Fourth Embodiment]
In the fourth embodiment, only changes from the third embodiment will be described. Here, the parts other than the explanation part are the same as in the third embodiment.

(Constitution)
FIG. 11 is a block diagram showing a configuration of a plant monitoring control system according to the fourth embodiment.

  The movable abnormality plant monitoring unit 61 of the remote operation unit 1 of the plant monitoring control system according to the fourth embodiment has a function degenerate location selector 71 for the movable abnormality plant monitoring unit 61 in the third embodiment. In addition.

(Function)
Next, the operation of the plant monitoring control system according to the fourth embodiment will be described.

  FIG. 12 is a flowchart showing the process of step S23 of FIG. 8 as the operation of the plant monitoring control system according to the fourth embodiment.

  In step S23, when the network connection unit 60 of the remote operation unit 1 is connected to the network, the movable abnormal time plant monitoring unit 61 of the remote operation unit 1 performs setting monitoring from the setting monitoring control device 80-1a. A function degeneration location selection command signal 73 for designating a new setting monitoring dedicated device whose function is degenerated from the dedicated device 80-1a 'is transmitted to the control device 3 via the network (step S41).

  When the functional degeneration mode switching command unit 21 of the control device 3 receives the function degeneration location selection command signal 73 transmitted from the function degeneration location selector 71 (YES in step S42), the function degeneration mode setting signal during abnormality is received. Instead of 22, the function degeneration location selection command signal 73 transmitted from the function degeneration location selector 71 is stored in the storage unit 81. That is, the setting monitoring dedicated device 80-1a 'is updated to a new setting monitoring dedicated device (step S43).

  In this case, in step S23, the abnormal function degeneration mode switching command unit 21 of the control device 3 supplies the set voltage to the new dedicated setting monitoring device based on the function degeneration location selection command signal 73 stored in the storage unit 81. To do.

(effect)
According to the plant monitoring and control system according to the fourth embodiment, in addition to the effects of the third embodiment, the operator can arbitrarily change the degeneration location with the function degeneration location selector 71.

[Other Embodiments]
As mentioned above, although some embodiment of this invention was described, these embodiment is shown as an example and is not intending limiting the range of invention. These novel embodiments can be implemented in various other forms, and various omissions, replacements, modifications, and features of the embodiments can be combined without departing from the spirit of the invention. . These embodiments and modifications thereof are included in the scope and gist of the invention, and are included in the invention described in the claims and the equivalents thereof.

DESCRIPTION OF SYMBOLS 1 ... Remote operation part 2a ... Plant operation signal 2b ... Plant monitoring signal 3 ... Control apparatus 4a, 4b ... Control part 5-1 to 5-n ... Input part 6-1 to 6-n ... Output part 7-1-7 -N ... Relay part 8-1 to 8-n ... Other devices 9 ... Input signal 10 ... Output data 11 ... Transmitter 12 ... Field part (sensor, equipment, etc.)
13a, 13b ... Distribution board 14a, 14b ... Power supply monitor 15a, 15b ... Power supply 16 ... Power supply line 17 ... Transmitter power supply source 18 ... I / O devices 19a, 19b ... Power supply system 20 ... Abnormal function degeneration mode setting device 21 ... Function degeneration mode switching command at abnormal time 22 ... Function degeneration mode setting signal at abnormal time 23 ... Function degeneration mode command signal at abnormal time 24 ... Power supply monitoring signal 25-1, 25-2 ... Control device power supply switching device 26 ... On Output device supply power switch 27 ... I / O signal switch 28-1 to 28-n ... Relay unit supply power switch 29-1 to 29-n ... Other device supply power switch 30a, 30b ... Emergency power supply 50 ... Remote operation unit built-in battery 51 ... Display 52 ... Built-in battery switch 52a ... Normal terminal 52b ... Abnormal end 52c ... Common terminal 53 ... Transmitter power switch 53a ... Normal terminal 53b ... Abnormal terminal 53c ... Common terminal 54 ... Battery with built-in controller 55 ... Abnormal plant monitoring signal 60 ... Network connection 61 ... Movable abnormal plant monitoring Unit 63 ... Abnormal plant monitoring unit connection confirmation sensor 64 ... Abnormal power line switch 64a ... Normal terminal 64b ... Abnormal terminal 64c ... Common terminal 64d ... Abnormal terminal 65 ... Abnormal power supply line 71 ... Function degeneracy location Selector 73 ... Function degeneration location selection command signal 80-1a to 80-na, 80-1b to 80-nb ... Monitoring control device 80-1a '... Setting monitoring dedicated device 81 ... Storage unit

Claims (10)

A remote operation unit that transmits a plant operation signal for controlling the plant, and is connected to the remote operation unit via a network, and controls the plant based on the plant operation signal from the remote operation unit; A plant monitoring control system comprising: a control device that transmits a plant monitoring signal representing a monitoring result to the remote control unit via the network;
The control device includes:
A plurality of multiplexed power supply devices each for converting a supply voltage supplied from a power supply system into a set voltage;
When the set voltage is supplied, an input signal output from a field unit, which is a peripheral device of the plant, is input and transmitted as the plant monitoring signal to the remote control unit via the network. A plurality of supervisory control devices that output the plant operation signal from the operation unit to the field unit as output data,
When the plurality of power supply devices are monitored, the set voltage is supplied to the plurality of monitoring control devices in a normal state, and at least one of the plurality of power supply devices cannot output in an abnormal state An abnormal function degeneration mode switching command device for supplying the setting voltage to a setting monitoring control device that is a preselected monitoring control device among the plurality of monitoring control devices;
A plant monitoring control system comprising: The remote operation unit further includes an abnormal function degeneration mode setting device that transmits an abnormal function degeneration mode setting signal for pre-designating the setting monitoring control device to the control device via the network,
The abnormal function degeneration mode switching command unit of the control device includes a storage unit that stores the abnormal function degeneration mode setting signal transmitted from the abnormal function degeneration mode setting device, and the storage unit in the abnormal state Supplying the setting voltage to the setting monitoring control device based on the abnormal function degeneration mode setting signal stored in
The plant supervisory control system according to claim 1. The abnormal function degeneration mode switching command unit of the control device includes a storage unit in which an abnormal function degeneration mode setting signal for designating the setting monitoring control device is stored in advance, and the storage unit in the abnormal state Supplying the setting voltage to the setting monitoring control device based on the abnormal function degeneration mode setting signal stored in
The plant supervisory control system according to claim 1. The control device further includes a control device built-in battery capable of supplying the set voltage,
The abnormal function degeneration mode switching command unit of the control device is a pre-selected monitoring dedicated device among the setting monitoring control devices when the plurality of power supply devices cannot be output at the time of the abnormality. Supplying the set voltage from the control device built-in battery to a certain setting monitoring dedicated device;
The setting monitoring dedicated device of the control device inputs an input signal output from the field unit when the set voltage is supplied, and uses the input signal as the plant monitoring signal at the time of the abnormality. Send to the operation unit via the network,
The plant monitoring control system according to any one of claims 1 to 3, wherein The remote operation unit further includes a battery with a built-in remote operation unit capable of supplying the set voltage,
The function degeneration mode switching command unit at the time of abnormality of the control device supplies the setting voltage from the control device built-in battery to the setting monitoring dedicated device when the plurality of power supply devices cannot be output at the time of the abnormality. Then, when the continuous supply possible time in which the set voltage can be continuously supplied by the control device built-in battery has been reached, the remote operation unit built-in battery of the remote control unit is connected to the dedicated setting monitoring device via the network. Supply set voltage,
The plant supervisory control system according to claim 4. The remote operation unit is further provided with a movable abnormal plant monitoring unit provided with the remote operation unit built-in battery and having a network connection unit connectable to the network.
The control device monitors an abnormal power supply line connecting the remote operation unit built-in battery of the remote operation unit on the network and the control device, and the network connection unit of the remote operation unit is connected to the network. An abnormality plant monitoring unit connection confirmation sensor that outputs a detection signal when the set voltage supplied from the remote operation unit built-in battery is detected on the abnormality power supply line,
The abnormal-time function degeneration mode switching command unit of the control device receives the detection signal output from the abnormal-time plant monitoring unit connection confirmation sensor and outputs the detection signal to the setting monitoring dedicated device in the abnormal time. When the settable voltage is supplied from the built-in battery and the continuous supply time is reached, the set voltage is supplied from the remote control unit built-in battery of the remote control unit to the dedicated setting monitoring device via the network. ,
The plant monitoring and control system according to claim 5. When the network connection unit of the remote operation unit is connected to the network, the movable abnormality plant monitoring unit of the remote operation unit is more than the setting monitoring dedicated device among the setting monitoring control devices. A function degeneration location selector for transmitting a function degeneration location selection command signal for designating a new setting monitoring dedicated device for degenerating a function to the control device via the network;
The function degeneration mode switching command device at the time of abnormality of the control device is configured to apply the set voltage to the new dedicated device for setting monitoring based on the function degeneration location selection command signal transmitted from the function degeneration location selector at the time of the abnormality. Supply,
The plant monitoring control system according to claim 6. The abnormal function degenerate mode switching command unit of the control device monitors the plurality of power supply devices, and as a result, when the plurality of power supply devices are restored and can be output, the plurality of monitoring controls at the normal time Supplying the set voltage to the appliance
The plant monitoring control system according to any one of claims 1 to 7, wherein Plant monitoring connected to a remote operation unit that transmits a plant operation signal for controlling the plant via a network, controlling the plant based on the plant operation signal from the remote operation unit, and representing a monitoring result of the plant A control device of a plant monitoring control system that transmits a signal to the remote control unit via the network,
A plurality of multiplexed power supply devices each for converting a supply voltage supplied from a power supply system into a set voltage;
When the set voltage is supplied, an input signal output from a field unit, which is a peripheral device of the plant, is input and transmitted as the plant monitoring signal to the remote control unit via the network. A plurality of supervisory control devices that output the plant operation signal from the operation unit to the field unit as output data,
When the plurality of power supply devices are monitored, the set voltage is supplied to the plurality of monitoring control devices in a normal state, and at least one of the plurality of power supply devices cannot output in an abnormal state An abnormal function degeneration mode switching command device for supplying the setting voltage to a setting monitoring control device that is a preselected monitoring control device among the plurality of monitoring control devices;
A control apparatus for a plant monitoring control system, comprising: A control device connected via a network to a remote operation unit that transmits a plant operation signal for controlling the plant controls the plant based on the plant operation signal from the remote operation unit, and the monitoring result of the plant A plant monitoring control method for transmitting a plant monitoring signal representing the remote control unit via the network,
A plurality of multiplexed power supply devices each converting a supply voltage supplied from a power supply system into a set voltage;
Monitoring the plurality of power supplies;
Supplying the set voltage to a plurality of monitoring control devices at normal time; and
When the set voltage is supplied to the plurality of supervisory control devices, the plurality of supervisory control devices inputs an input signal output from a field unit that is a peripheral device of the plant, and the plant monitoring is performed. Transmitting the signal as a signal to the remote control unit via the network, and outputting the plant operation signal from the remote control unit as output data to the field unit;
When at least one power supply device among the plurality of power supply devices is unable to output at the time of an abnormality, the setting monitoring control device which is a preselected monitoring control device among the plurality of monitoring control devices Supplying a set voltage; and
A plant monitoring control method comprising:

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