JPH07219627A - Monitor and control system - Google Patents

Abstract

PURPOSE:To make a display process load uniform and effectively utilize the processing function of the whole system by moving the display operation of some display function group of its own monitor device to display function groups of other monitor devices which are small in total load quantity when the total load quantity of its own monitor device is larger than the total load quantity of other respective the monitor devices by more than prescribed. CONSTITUTION:The load quantities of respective display function parts 16 are read out of respective CRT management function parts 15 of respective display function groups 10 in ON states. Load data from basic software 13 are added to the respective read load quantities and the total load quantity of the whole monitor device 4a is calculated. The total load quantity of its own device is sent to respective other monitor devices 4a through a CRT management input function part 14 and a control LAN 3. Simultaneously, the respective total load quantities of other monitor devices 4a are received. The stored total load quantity of its own device is compared with other total load quantities and when there is a large difference, part of the display operation of its own device is automatically moved to other display function groups 10 which are small in total load quantity.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a supervisory control system for supervising and controlling a process state of a plant with a plurality of control devices and supervisory devices. In particular, the present invention relates to a supervisory control system capable of automatically equalizing the load amount between the supervisory devices.

[0002]

2. Description of the Related Art For example, in a supervisory control system for supervising and controlling the operation of each equipment constituting a large-scale plant such as a water and sewage plant, a steel plant, an oil plant, etc.
Since it is difficult to monitor and control the process states of all the devices that make up the plant with one controller and one monitoring device, for example, as shown in FIG. 5, a plurality of control devices and a plurality of monitoring devices are used. Also, monitoring control is performed by a plurality of CRT display terminal devices.

In FIG. 5, each controller 1 is a plant 2
The process data indicating the operating state is taken in from each device that composes the device, the predetermined control process is performed on this process data, and the operation result is sent to each device as the manipulated variable to show the operating state of each device. Control to the target value.

The process control status of each device of each control device 1 is transmitted to each monitoring device 4 via the control LAN 3. Each monitoring device 4 takes in the data of the process control status assigned to itself in advance among the process control statuses output from the respective control devices 1 to the control LAN 3, and edits the data into a predetermined display format to display the CRT display terminal device. Display output to 6.

Each CRT display terminal device 6 comprises a CRT display device 6a and a keyboard 6b, as shown in the drawing.
The necessary information selected by the plant supervisor using the keyboard 6b is displayed on the CRT display device 6a.

In this case, each CRT display terminal device 6 is logically connected to one monitoring device 4 which is predetermined in this control and monitoring system. Since the logical connection is fixed, it does not matter whether or not one information LAN 5 connects all the monitoring devices 4 and all the CRT display terminal devices 6 by hardware.

For example, in the control and monitoring system shown in FIG. 5, one CRT display terminal device 6 (1), (2) is logically connected to the monitoring device 4 (1) and the other CRT display terminal device 6 is used. (3) and (4) are connected to another monitoring device 4 (2).

Each monitoring device 4 is composed of, for example, an industrial work station, and each CRT called an X terminal.
CS with the display terminal device 6 via the information LAN 5
Information exchange is carried out using standard protocols such as MA / CD and IEEE802.3.

Each monitoring device 4 is composed of an input / output function section 7, a monitoring function section 8 and a plurality of display function sections 9, as shown in FIG. 6, for example. The monitoring function unit 8 has a control LAN 3
Management, storage of process monitoring data input / output via the input / output function unit 7 that controls input / output of various information with respect to
Alert and record.

Each display function unit 9 holds a logical connection relationship with the CRT display terminal device 6 connected to the monitoring device 4, and the display from the CRT display terminal device 6 designated by the monitor by the keyboard 6b. The request is transmitted to the monitoring function unit 8, and the process monitoring data is displayed on the CRT display terminal device 6 having the logical connection according to the display request from the monitoring function unit 8.

Therefore, each display function unit 9 corresponds to each CRT display terminal device 6 connected to the monitoring device 4 on a one-to-one basis. Generally, C that can be connected to one monitoring device 4
The total number of RT display terminal devices 6 is determined according to the display load amount. For example, in a supervisory control system for a plant 2 in which many of the devices that require high-speed response performance are incorporated, a large number of CRT display terminal devices 6 are required. In this case, the software configuration showing a part or all of the display function of each CRT display terminal device 6 of each monitoring device 4 is often incorporated in the other monitoring devices 6 in common. That is, a plurality of CRs are provided by a plurality of monitoring devices 4 that share some or all of the software.
The display of the T display terminal device 6 is controlled.

[0012]

However, as described above, each monitoring device 4 and this monitoring device 4 have the following problems to be solved even in the control and monitoring systems shown in FIGS. 5 and 6. The logical connection relationship with each CRT display terminal device 6 that is logically connected to is uniquely determined when the control and monitoring system is constructed. Therefore,
For example, when the supervisor of the plant 2 intensively displays a large amount of process monitoring data only on each CRT display terminal device 6 that is logically connected to the same monitoring device 4, CRT display terminal device 6
There is a concern that the load of display processing on the other will increase and the other monitoring devices 4 will be in a state of waiting for a load input, resulting in a state in which resources cannot be effectively utilized in the entire control and monitoring system.

For example, in the control and monitoring system shown in FIG. 5, the CRT display terminal device 6 (1) is used to monitor the device 4.
It is assumed that a heavy display processing load is imposed on (1). The screen display with a heavy load means a screen displayed by a program that uses a large storage capacity of the main memory of the monitoring device 4, a screen with a short screen display update cycle, or a program that frequently accesses the disk memory. The display processing for the screen is shown. In this case, if another plant supervisor inputs a new heavy screen display request from the keyboard 6b of the different CRT display terminal device 6 (2), the display processing for this display request is naturally the same monitoring device 4 It is implemented in (1).

In this case, in the entire supervisory control system, the load is concentrated on one of the monitoring devices 4 (1) even if the other monitoring device 4 (2) is in a load-free state, and a new display is made this time. Not only the requested display performance in the CRT display terminal device 6 (2) but also the display performance already being displayed in the CRT display terminal device 6 (1) deteriorates.

Further, since the connection relationship between each monitoring device 4 and each CRT display terminal device 6 is uniquely fixed to one to one, a plurality of monitoring devices 4 (1). When an abnormality occurs in one of the monitoring devices 4 (1) due to some factor in (2), each CRT connected to this monitoring device 4 (1)
There is a problem that the display terminal devices 6 (1) and 6 (2) cannot be used at all and the process monitor data pre-assigned to these CRT display terminal devices 6 (1) and 6 (2) cannot be monitored by an observer. is there.

The present invention has been made in view of the above circumstances, and according to the load condition, the logical connection between each monitoring device and each CRT display terminal device is not fixed uniquely. With the changeable configuration, when the display load concentrates on a specific monitoring device, some display tasks can be moved to other monitoring devices and the display processing load on each monitoring device is automatically reduced. An object of the present invention is to provide a supervisory control system that can be made uniform and can effectively utilize the processing functions of the entire system.

Further, even when an abnormality occurs in a specific monitoring device, the display work of the monitoring device in which the abnormality has occurred can be automatically replaced by another normal monitoring device. It is an object of the present invention to provide a supervisory control system that can improve reliability.

[0018]

In order to solve the above problems, the present invention provides one or more control devices for controlling a process state of a plant and processes of each control device which are commonly connected to each control device. Supervisory control including a plurality of monitoring devices for monitoring the control status, and a plurality of CRT display terminal devices that are commonly connected to the respective monitoring devices via a transmission line and each display a process control status of a predetermined type In the system, a plurality of display function groups for causing each monitoring device to take in each process control state assigned to each CRT display terminal device from each control device and display it on the corresponding CRT display terminal device, and each display function A display function group control unit for controlling ON / OFF of the operation of the group, a load amount totaling means for totaling the load amount of the display function group in the ON state, the total load amount of the self-monitoring device and the other total amount When comparing the total load amount of each monitoring device with the comparison means, and when the total load amount of its own monitoring device is larger than the total load amount of each other monitoring device by more than the specified value, the display function group control unit is driven. And a work transfer means for moving the display work of a part of its own display function group to another display function group of the monitoring device having a light total load.

Further, in another invention, in addition to each means in the above-mentioned invention, each monitoring device is provided with an abnormality detecting means for detecting an abnormality of the display function group in an ON state, and in response to the abnormality detection of the abnormality detecting means. Then, an abnormal work transfer means for moving the display work of each display function group of its own ON state to another display function group of the monitoring device having a light total load is added.

[0020]

In the supervisory control system configured as described above, it is possible to logically connect to each CRT display terminal device incorporated in the supervisory control system in each supervisory device as required. As many display function groups as CRT display terminal devices are provided. The operation of each display function group can be turned on / off by the display function group control unit.

Each monitoring device constantly monitors the total load amount, which is the total load amount of each display function group in its ON state. Each monitoring device notifies each other of the total load amount, and when the total load amount of one monitoring device becomes extremely large compared to the total load amount of another monitoring device, the total load amount is large. The display work of a part of the display function group in the monitoring device is automatically moved to the display function group of the monitoring device having a small total load.

Therefore, the display processing work is not concentrated on a specific monitoring device, and the display processing load of each monitoring device becomes substantially equal. In addition, when an error occurs in a specific monitoring device, the display work of the display function group of the monitoring device in which the error has occurred is automatically displayed in the display function group of another normal monitoring device with a small total load. Move.

Therefore, even if an abnormality occurs in one monitoring device, the plant monitor can continuously monitor the process control status of each device of the plant with the same CRT display terminal device.

[0024]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 2 is a block diagram showing a schematic configuration of the supervisory control system of the embodiment. The same parts as those of the conventional supervisory control system shown in FIG. 5 are designated by the same reference numerals. Therefore, detailed description of the overlapping portions is omitted.

Each control device 1 takes in process data indicating an operating state from each device constituting the plant 2 and executes a predetermined control calculation process on this process data,
The calculation result is sent to each device as a manipulated variable, and the operating state of each device is controlled to a target value.

The process control status of each device of each control device 1 is sent to the control LAN 3. A plurality of monitoring devices 4a are connected to the control LAN 3. Then, each monitoring device 4a has one common information LAN as a transmission line.
A plurality of CRT display terminal devices 6 are connected via 5a. As shown in the figure, each CRT display terminal device document 6
It comprises a CRT display device 6a and a keyboard 6b, and necessary information selected by a plant supervisor using the keyboard 6b is displayed on the CRT display device 6a.

Each CRT display terminal device 6 is in a logically connected state with any one monitoring device 1, as will be described later. The difference from the conventional system shown in FIG. 5 is that this logical connection is automatically switched during system operation based on the load state of each monitoring device 4a or normal / abnormal state (healthy state). Is.

FIG. 1 is a block diagram showing the detailed arrangement of each monitoring device 4a. In each monitoring device 4a, a number of display function groups 10 corresponding to the number of installed CRT display terminal devices 6 incorporated in this monitoring control system, and one monitoring function unit 8 are provided.
An input / output function unit 7, a display function group control unit 11, a display function group 12 that manages the load status of each display function group 10,
Basic software 13 and CRT management input / output function unit 14
And are incorporated. Further, each display function group 10 is a CRT.
The management function unit 15 and the display function unit 16 are included.

The monitoring function unit 8 manages, stores, alarms, and records process monitoring data input / output through the input / output function unit 7 that controls input / output of various information to / from the control LAN 3.

The display function group control unit 11 individually turns on / off the operation of each display function group 10 based on a command from the display function group management unit 12. Therefore, each display function group 10 controlled to be in the ON state is logically connected to the CRT display terminal device 6 assigned to it in advance through the information LAN 5a, and is connected to the corresponding CRT display terminal device 6. Information is exchanged between them according to the above-mentioned communication protocol. Further, each display function group 10 controlled to the off state is
The connection state with the CRT display terminal device 6 which has been in the logical connection state until now is released.

Display function unit 1 constituting each display function group 10
6 maintains a logical connection relationship with the CRT display terminal device 6 connected to the monitoring device 4a in the ON state,
The display request from the corresponding CRT display terminal device 6 is transmitted to the monitoring function unit 8 and the process monitoring data is displayed on the CRT display terminal device 6 according to the display request from the monitoring function unit 8.

The CRT management function section 15 constituting each display function group 10 has its own display function section 1 in the ON state.
A mechanism for quantitatively grasping, in real time, the screen update cycle, the amount of display data, the delay in response to a display request, etc., out of the indexes relating to the load “heaviness” of the screen program displayed on the CRT display terminal device 0 at 0. And loads the value as a load amount to the display function group management unit 12 at a constant cycle.

Further, the CRT management function unit 15 constantly monitors the normality / abnormality (healthy state) of the display function unit 16 constituting its own display function group 10, and when abnormality occurs, the abnormality occurrence information is displayed. It is transmitted to the function management unit 12. The occurrence of an abnormality is, for example, a case in which the corresponding display data is not transmitted from the display function unit 16 despite the display request from the corresponding CRT display terminal device 6.

The display function management unit 12 is composed of a kind of microcomputer, and is programmed so as to execute the load adjustment processing shown in FIG. 3 every time a predetermined minute time ΔT has elapsed.

When the flow chart of FIG. 3 is started, in P (program step) 1, the load amount of each display function unit 16 is read from each CRT management function unit 15 of each display function group 10 in the ON state. By adding the load data regarding the occupied main memory and the load data regarding disk access from the basic software 13 to each read load amount, the total load amount of the entire monitoring device 4a is calculated (P
2). The calculated total load amount is temporarily stored and held in the internal memory (P3).

Then, the total load of the self is transmitted to each of the other monitoring devices 4a via the CRT management input / output function unit 14 and the control LAN 3. At the same time, the total load amount of each of the other monitoring devices 4a transmitted from each of the other monitoring devices 4a is received via the CRT management input / output function unit 14 (P4). Then, the stored total load amount of the self and the received total load amount of each of the other monitoring devices 4a are compared and collated, and between the own total load amount and each total load amount of the other monitoring devices. If there is a large difference, it is judged that the load adjustment is necessary (P5).

When the total load amount of the self is larger than the preset total load amount of each other monitoring device 4a by (P)
6), CRT to other monitoring device 4a with the smallest total load
One or more CRTs via the management input / output function unit 14
A load acceptance request specifying the display terminal device 6 is transmitted (P
7).

Then, the display function group 10 for the CRT display terminal device 6 which has transmitted the load acceptance request is turned off via the display function group control section 11 (P8). As a result, the logical connection state between the self-monitoring device 4a and the CRT display terminal device 6 to be accepted is eliminated, and the total load amount of the self-monitoring device 4a is reduced.

When a load acceptance request is received from another monitoring device 4a that specifies one or more CRT display terminal devices 6 via the CRT management input / output function unit 14 (P
9) The display function group 10 corresponding to the CRT display terminal device 6 designated by the received load acceptance request is turned on via the display function group control unit 11 (P10). As a result, a new logical connection state is generated between the self-monitoring device 4a and the CRT display terminal device 6 to be underwritten, and the total load amount of the self-monitoring device 4a increases.

In this way, when the total load amount of the self is extremely large as compared with the total load amount of the other monitoring device 4a, a part of the display work of the self is carried out by the monitoring device 4a having the small other total load amount.
The display function group 10 is automatically moved to.

For example, in FIG. 2, when a high load screen display is being performed on the CRT display terminal device 6 (1), a new display request is issued to another CRT display terminal device 6 (2). The display function group management unit 12 uses the monitoring device 4a.
It is determined that the total load amount of the CRT display terminal device 2 (2) is larger than that of the other monitoring device 4a, and the load acceptance request of the CRT display terminal device 2 (2) is sent to the other monitoring device 4a in the light load state. This avoids concentration of the display load on the specific monitoring device 4a,
As a whole supervisory control system, performance leveling and optimum display performance can be derived.

Further, the display function group management section 12 is programmed so as to execute the abnormality monitoring processing shown in FIG. In FIG. 4, when the abnormality occurrence information is received from the CRT management function unit 15 in the ON state (Q1), the abnormality occurrence information designating the CRT display terminal device 6 corresponding to all the display function groups 10 in the ON state is entered in the CRT management. It transmits to the other monitoring apparatus 4a via the output function part 14 (Q2). Then, the display function group 10 in the ON state is controlled via the display function group control unit 11.
To turn off.

When abnormality information is received from another monitoring device 4a via the CRT management input / output function unit 14 (Q
3), transmitting its own current total load amount to the other monitoring device 4a and receiving each total load amount of the other monitoring device 4a (Q
4). Then, when the self is the minimum total load amount, the display function group 10 corresponding to the CRT display terminal device 6 included in the received abnormality occurrence information is changed to the ON state (Q6).

As a result, when an abnormal state occurs in one monitoring device 4a, the CRT display terminal which is logically connected to the abnormal monitoring device 4a automatically without the manual operation of the monitoring staff. The logical connection between the device 6 and the monitoring device 4a in which the abnormality has occurred is canceled, and subsequently, a new logical connection state is automatically formed with the normal monitoring device 4a. Therefore, the observer will continue to use the same CRT.
It is possible to continue the monitoring work with the display terminal device 6.

[0045]

As described above, according to the supervisory control system of the present invention, the load condition can be changed without univocally fixing the logical connection between each surveillance device and each CRT display terminal device. It is configured to be changeable accordingly. Therefore, when the display load is concentrated on a specific monitoring device, part of the display work can be moved to another monitoring device, and the display processing load on each monitoring device can be automatically equalized. The processing functions of the whole can be effectively utilized.

Further, even when an abnormality occurs in a specific monitoring device, the display work of the monitoring device in which the abnormality has occurred is automatically performed without any manual operation by a monitoring staff member. Can be substituted for, and the reliability of the entire system can be improved.

[Brief description of drawings]

FIG. 1 is a block diagram showing a monitoring device of a monitoring control system according to an embodiment of the present invention.

FIG. 2 is an overall configuration diagram of the system according to the embodiment.

FIG. 3 is a flowchart showing the operation of the system of the embodiment.

FIG. 4 is a flow chart showing the operation of the system of the same embodiment.

FIG. 5 is an overall configuration diagram of a conventional supervisory control system

FIG. 6 is a block diagram showing a monitoring device of the conventional system.

[Explanation of symbols]

1 ... Monitoring device, 2 ... Plant, 3 ... Control LAN, 4a ...
Monitoring device, 5a ... Information LAN, 6 ... CRT display terminal device, 6a ... CRT display device, 6b ... Keyboard, 7 ... Input / output function part, 8 ... Monitoring function part, 10 ... Display function group, 11
... Display function group control unit, 12 ... Display function group management unit, 13 ...
Basic software Eua, 14 ... CRT management input / output function unit, 1
5 ... CRT management function unit, 16 ... Display function unit.

Claims (2)

[Claims] 1. One or more control devices for controlling a process state of a plant and commonly connected to each of the control devices,
A plurality of monitoring devices that monitor the process control status of each of the control devices, and a plurality of CRT display terminal devices that are commonly connected to each of the monitoring devices via a transmission line and that respectively display a predetermined type of process control status. In the supervisory control system including: a plurality of displays, wherein each of the monitoring devices takes in each process control state assigned to each of the CRT display terminal devices from each of the control devices and displays the status on a corresponding CRT display terminal device. A function group, a display function group control unit for ON / OFF controlling the operation of each display function group, a load amount totalizing means for totaling the load amount of the display function group in the ON state, and the totalized self-monitoring device Comparing means for comparing the total load amount of each monitoring device with the total load amount of each other monitoring device, and when the total load amount of its own monitoring device is greater than the specified load compared to the total load amount of each other monitoring device. A monitor comprising drive means for driving the display function group control unit to move display work of a part of its own display function group to a display function group of another monitoring device with a light total load. Control system. 2. Each of the monitoring devices detects an abnormality in an on-state display function group, and in response to the abnormality detection by the abnormality detection means, displays each of the on-state display function groups. 2. The supervisory control system according to claim 1, further comprising: an abnormal work transfer means for moving a work to a display function group of another monitoring device having a light total load.