JP4993577B2 - Plant control system - Google Patents

Description

  The present invention relates to a plant control system, and more particularly to a configuration technique for reducing display control units constituting a plant control system.

  In general, in plant control systems such as power plants and factories, the unit computer that starts and stops the plant control system, manages each data, calculates, etc., and the CRT controller that controls the interface with the operator and the sub-loop control device are independent The entire system is controlled and monitored by building a network with individual systems with the above functions.

  FIG. 4 is a diagram showing an example of a system configuration of a conventional plant control system. The plant control system 120 includes a unit computer 50 that controls start and stop of a plant, management and calculation of each data, a network 65 such as an in-house LAN, and a plurality of CRT devices 57 connected to the network 65. It is configured. Then, the unit computer 50 displays a display screen of the PIO unit 54 that controls input / output data with an instrument installed in the plant, a printer 55 that tabulates management data and prints it on recording paper, and a CRT device 57. A hard copy 56 to be printed on paper as an image, a unit calculation unit 51 and a unit calculation unit 53 for starting and stopping an actual plant, managing and calculating each data, a duplicated unit calculation unit 51 and a unit calculation unit 53 And a duplexing switch 52 that makes any one of the controls effective.

In this configuration, each CRT device 57 is configured to operate the same data, and is connected to the unit calculator 51 and the unit calculator 53 via the network 65. Therefore, for example, when the unit calculator 51 is set as the master side, the plant and each CRT device 57 are controlled by data from the unit calculator 51 during normal operation. At that time, since the unit calculation unit 53 always operates in the same manner as the unit calculation unit 51, the programs are executed simultaneously.
If the unit calculation unit 51 becomes abnormal for some reason, the duplex switch 52 switches to the unit calculation unit 53 side and continues control of the plant and each CRT device 57.

As a conventional technique, Patent Document 1 discloses that a plant device state analog signal measured and output by a plurality of plant devices is converted into a digital signal, and the state of each plant device is displayed based on the digital signal through a controller. In the plant monitoring and control system for controlling each plant device according to a control command from the display device, the plant equipment state data with time data at the most upstream side of each plant device side of the signal system of the digital signal Is generated, and a plant monitoring control system for displaying the plant equipment state associated with the time based on the plant equipment state data with time data is disclosed.
Japanese Patent Laid-Open No. 2004-199624

However, in the conventional plant control system 120 shown in FIG. 4, in order to improve the reliability of the plant system, not only the unit calculation unit in the unit computer 50 but also a plurality of CRT devices 57 must be provided. Therefore, a CRT controller is required for each CRT, resulting in a problem that system cost increases, installation space increases, and maintenance cost increases.
Further, according to the prior art disclosed in Patent Document 1, the state signal of the plant equipment is shifted by the transmission delay every time a transmission delay occurs between the actual output time and the time of the time stamp. In order to prevent this deviation, plant equipment state data with time data is generated at the most upstream of each plant equipment side of the signal system of the digital signal, and the display device associates the time with the time based on the plant equipment state data with time data. The device status is displayed, but it does not improve the actual transmission delay, so in the case of a system using a network in particular, data transmission becomes a standby state due to the network congestion, and an abnormal situation occurs. There is a problem that a quick response cannot be made when it occurs.

  The present invention has been made in view of such a problem, and includes a function of a unit control unit that controls a plant system in a display control unit that controls a display device including an operation unit, and the display control unit is a unit. By providing in the calculation unit, it is possible to control the display operation without going through the network, and provide a plant control system that can quickly respond when a failure occurs by minimizing the transmission delay of the display operation The purpose is to do.

In order to solve this problem, the present invention provides a plant control system that controls and monitors the entire plant, and includes two display units for displaying data contents , start and stop of the plant, Two display control units each having a unit control unit for managing and calculating data and individually controlling the two display units, switching means for enabling control of any one of the two display control units, and the plant A unit calculation unit having a peripheral IO control unit for controlling input / output data exchanged with an instrument arranged in the network, and a network connecting the unit calculation unit and the APC control unit for controlling each plant; The display control unit and the display unit are directly connected without going through the network.
Generally, a display control unit of a display device has a function similar to that of a unit control unit. Therefore, in the present invention, the function (software) of the unit control unit is included in the display control unit of the display device provided outside the unit calculation unit, and only the hardware of the display control unit is provided in the unit calculation unit. The unit and the display unit are connected. As a result, the data of the display device that was connected via the conventional network is directly connected to the display controller without going through the network, minimizing the delay of operation data and reducing the installation space for the display controller. Thus, reduction of system cost and reduction of maintenance cost can be realized.

According to a second aspect of the present invention, each display unit is controlled by each display control unit during normal operation of each display control unit.
When the unit control unit in the unit calculation unit is duplicated, a display control unit having the same function and a switching unit for enabling one of the two unit control units are required. Each display control unit is connected to a display unit and controlled individually. Thereby, even during the duplex operation in which the unit control unit in one display control unit controls the plant system, only the display control unit can operate simultaneously to control each display unit.

According to a third aspect of the present invention, when one of the two display control units is a master control unit and the other is a slave control unit, the slave control unit is normal and the master control unit is malfunctioning by the switching unit. If it is determined that there is, the operation of the master control unit is stopped, thereby invalidating the display of the display unit connected to the master control unit, and the operation of the slave control unit is enabled to start the plant, The plant control system according to claim 1 or 2, wherein the stop, management of each data and calculation are continued.
In duplex operation, it is common to operate by positioning one as a master and the other as a slave. That is, when the power is turned on, the master side always takes the initiative to control the plant system, and the slave side assumes the role of taking over the operations until the master recovers when the master goes down. In this invention, when a master control part goes down, it switches to a slave control part by a switching means, and a slave control part continues control of a plant system. At that time, the display control unit in the down master control unit is also down at the same time, so the display unit connected thereto becomes invalid. However, since the display unit connected to the slave control unit that displays the same data is still alive, there is no problem in operation.

According to a fourth aspect of the present invention, when a plurality of display devices having the display unit and the display control unit are provided, the display control unit controls the display device with the same data.
In the case of a plant system, not only the unit control unit is duplicated, but also the display device is multiplexed to improve the reliability of the entire system. Therefore, all the data displayed on the display device displays the same content, and an operation instruction can be given to the unit control unit from any display device.

  According to the present invention, there is provided a plant control system that controls and monitors the entire plant, between a unit control unit that controls start and stop of a plant, management and calculation of each data, and an instrument installed in the plant. And a peripheral I / O control unit for controlling input / output data, and when the unit calculation unit is connected to a display device including a display unit and a display control unit via a network, display control is performed. The function of the unit control unit is included in the unit, the display control unit is provided in the unit calculation unit, and the display control unit and the display unit are directly connected without a network, so that the delay of operation data is minimized. At the same time, the installation space for the display control unit is reduced, and system costs and maintenance costs can be reduced.

Hereinafter, the present invention will be described in detail with reference to embodiments shown in the drawings. However, the components, types, combinations, shapes, relative arrangements, and the like described in this embodiment are merely illustrative examples and not intended to limit the scope of the present invention only unless otherwise specified. .
FIG. 1 is a block diagram of a plant control system according to the first embodiment of the present invention. The plant control system 100 is configured as a minimum configuration system. That is, a unit computer (unit calculation unit) 1 that manages start and stop of a plant, management and calculation of each data, a network 7 such as an in-house LAN, and a CRT (display unit) 6 connected to a CRT controller 5 It is prepared for. The unit computer 1 includes a unit control unit 5a that controls start and stop of the plant, management and calculation of each data, a CRT controller (display control unit) 5 that controls the CRT 6, and each instrument provided in the plant. 12, a PIO unit (peripheral IO control unit) 2 that controls input / output data, a printer 3 that tabulates management data and prints it on recording paper, and a display screen of the CRT 6 is printed on paper as an image. Hard copy 4. The network 7 includes, for example, an APC control device 8 that controls a plant, a burner control device 9 that controls a burner, a sequence control device 10 that controls a boiler, a turbine auxiliary circuit, and the like, and another control device 11. Is connected.

In the present embodiment, the unit computer 1 is configured to include the function of the unit controller 5a in the CRT controller 5 when the unit computer 1 can be connected to the display device including the CRT 6 and the CRT controller 5 via the network 7. The CRT controller 5 is provided in the unit computer 1 and the CRT controller 5 and the CRT 6 are directly connected without using the network 7.
That is, the CRT controller 5 of the CRT 6 has the same function as the unit controller 5a. Therefore, in the present embodiment, the function (software) of the unit controller 5a is included in the CRT controller 5 of the display device provided outside the unit computer 1, and only the hardware of the CRT controller 5 is included in the unit computer 1. The CRT controller 5 and the CRT 6 are connected. As a result, the data of the display device that has been conventionally connected via the network 7 is directly connected to the CRT controller 5 without via the network 7, minimizing the delay of operation data and the installation space for the CRT controller 5. As a result, system costs and maintenance costs can be reduced.

FIG. 2 is a block diagram of a plant control system according to the second embodiment of the present invention. The plant control system 110 is configured as a duplex system. The same constituent elements are denoted by the same reference numerals as those in FIG. FIG. 2 differs from FIG. 1 in that a duplex switch (switching) that enables further control of the CRT controller 14 and one of the two unit controllers 5a and 14a in order to duplicate the unit controller 5a. Means) 13, and CRTs 6 and 15 that are individually controlled are connected to the CRT controllers 5 and 14, respectively. During normal operation of the CRT controllers 5 and 14, the CRTs 6 and 15 are connected to the CRT controllers 5 and 14, respectively. 14, respectively. In addition, display devices 21 and 22 are connected to the network 7 in order to multiplex the display devices. The display devices 21 and 22 are composed of CRTs 16 and 17 and CRT controllers 18 and 19, respectively.

  That is, when the unit controllers 5a and 14a in the unit computer 1 are duplexed, the CRT controller 14 having the same function and the duplex switch 13 that activates one of the two unit controllers 5a and 14a are provided. Necessary. The CRT controllers 5 and 14 are connected to the CRTs 6 and 15 and controlled individually. Thereby, for example, even during the duplex operation in which the unit controller 5a in one CRT controller 5 controls the plant system, only the CRT controllers 5 and 14 can operate simultaneously to control the CRTs 6 and 15.

Further, in duplex operation, it is common to operate by positioning one as a master and the other as a slave. That is, when the power is turned on, the master side always takes the initiative to control the plant system, and the slave side assumes the role of taking over the operations until the master recovers when the master goes down. In the present embodiment, for example, when the unit control unit 5a is a master control unit and the unit control unit 14a is a slave control unit, when the master control unit 5a is down, the duplex switch 13 switches to the slave control unit 14a, The slave control unit 14a continues the control of the plant system. At that time, the CRT controller 5 in the master control unit 5a that has been down is also down at the same time, so the connected CRT 6 is invalidated. However, since the CRT 15 connected to the slave control unit 14a displaying the same data is alive as it is, there is no trouble in the operation.
In addition, the condition for enabling the duplex operation is that both the master control unit 5a and the slave control unit 14a are operating normally. Accordingly, the duplex switch 13 always checks both states, and if the master control unit 5a is normal but the slave control unit 14a goes down, the duplex operation will be hindered, so the CRT 15 connected to the slave control unit 14a. as invalid, redundant switch 13 is necessary to prevent switching to the slave control unit 14a side.

In the case of a plant system, not only the unit control unit is duplicated but also the display device is multiplexed to improve the reliability of the entire system. Accordingly, all the data displayed on the display device displays the same contents, and an operation instruction can be given to the unit control units 5a and 14a from any display device.
In the above embodiment, the case where the function of the unit controller is included in the CRT controller has been described. However, as another embodiment, the function of the CRT controller is added to the unit controller originally provided in the unit calculator 1. The hardware of the CRT controller provided outside the unit computer 1 may be reduced.

FIG. 3 is a flowchart for explaining the operation of the plant control system of the present invention. Here, a case where the unit control unit is duplicated will be described, and operations on the master side and the slave side will be described side by side. The description will be given with reference to FIG. When the power is turned on, the CRT controller 5 on the master side controls the CRT 6, and the unit controller 5a controls the plant via the PIO unit 2 (S1). At the same time, the slave-side CRT controller 14 controls the CRT 15, and the unit controller 14 a operates the program, but does not output an output signal from the PIO unit 2. That is, the initiative of control of the plant system is the unit control unit 5a, and the unit control unit 14a operates the program but does not actually control the plant.
The duplex switch 13 constantly monitors the operations of the unit controller 5a and the unit controller 14a (S2) (S6). For example, if the unit controller 5a is abnormal (NO in S2), the duplex switch 13 is switched on. Switching to the unit controller 14a (S3), the operation of the unit controller 5a and the CRT controller 5 is stopped (S4).

When the unit controller 14a receives a switching command from the duplex switch 13 (YES in S8), the unit controller 14a continues the control of the CRT 15 and the plant (S9). Then, whether or not the unit controller 14a is normal is checked by a fixed period or interruption processing (S10). If an abnormality occurs (NO in S10), the operations of the unit controller 14a and the CRT controller 14 are stopped (S11). Thereafter, the duplex switch 13 checks whether or not the unit controller 5a has been restored (S12). If the unit controller 5a has been restored (YES in S12), the duplex switch 13 causes the unit controller 5a to be restored. (S14), return to step S1 and repeat. On the other hand, if the unit controller 5a is not restored in step S12 (NO in S12), the entire system goes down (S13).
When the unit control unit 5a is normal and the unit control unit 14a becomes abnormal (NO in S6), the program of the unit control unit 14a is stopped, the control of the CRT controller 14 is stopped, and the unit control unit 5a The operation of the duplexing switch 13 is stopped so that the duplexing switch 13 is not switched to the unit control unit 14a side when S becomes abnormal (S7).

1 is a block diagram of a plant control system according to a first embodiment of the present invention. It is a block diagram of the plant control system concerning a 2nd embodiment of the present invention. It is a flowchart explaining operation | movement of the plant control system of this invention. It is a figure which shows an example of the system configuration | structure of the conventional plant control system.

Explanation of symbols

  1 unit computer, 2 PIO unit, 3 printer, 4 hard copy, 5, 14 CRT controller, 6, 15, 16, 17 CRT, 7 network, 8 APC controller, 9 burner controller, 10 sequence controller, 11 others Control device, 12 Each instrument, 13 Duplex switch, 5a, 14a Unit controller, 18, 19 CRT controller, 110 Plant control system

Claims (4)

A plant control system for controlling and monitoring the entire plant,
Two display units for displaying the data contents;
Unit control unit for controlling start and stop of the plant, management and calculation of each data, two display control units for individually controlling the two display units, and effective control of either one of the two display control units A switching unit , and a unit calculation unit having a peripheral IO control unit for controlling input / output data exchanged with the instrument installed in the plant,
A network connecting the unit calculation unit and the APC control device for controlling each plant;
With
The plant control system, wherein each display control unit and each display unit are directly connected without going through the network.   The plant control system according to claim 1, wherein each display unit is controlled by each display control unit during normal operation of each display control unit. When one of the two display control units is a master control unit and the other is a slave control unit, the switching unit determines that the slave control unit is normal and the master control unit is malfunctioning. In this case, by stopping the operation of the master control unit, the display of the display unit connected to the master control unit is invalidated, the operation of the slave control unit is validated, the plant is started, stopped, Management and calculation are continued, The plant control system according to claim 1 or 2 characterized by things. When the display device having the display control unit and the display unit is a plurality, any one of claims 1 to 3 wherein the display control unit and controls the display device by the same data The plant control system described in

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