JPH06348523A - Dual monitor control system - Google Patents

Abstract

PURPOSE:To securely monitor the operation control state of a system to be controlled even by using an inexpensive display terminal in which hardware for dual constitution is not incorporated. CONSTITUTION:Two display terminals 13 and 14 equipped with operation input devices 16 and a controller 12 which monitors and controls the operation state of the controlled system 11 are connected to the transmission line 10 of a network. Then the display terminals 13 and 14 send pieces of input information, inputted from the operation input devices that they are equipped to its own terminal, to the controller 12 through the transmission line 10. The controller 12 displays out the monitor control result to the display terminals 13 and 14 with the same format at the same time. Only the input information from one display terminal between the pieces of input information sent from the display terminals 13 and 14 is selected and the system 11 to be controlled is controlled based on the selected input information.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention monitors and controls a controlled object such as a plant with a control device and graphically displays the result of monitoring and control on a display terminal. In addition, two display terminals are provided to improve system reliability. The present invention relates to a dual supervisory control system that displays the same graphic image on the screen.

[0002]

2. Description of the Related Art In recent years, in a supervisory control system for controlling the operating states of various plants in factories and the like, a CRT display device for monitoring the operating states of the plant when a supervisor operates the plant is incorporated. .

Further, since the functions are distributed in each device,
As shown in FIG. 8, a control device 2 incorporating a graphic drawing program for graphically displaying the operating state of the plant 1 to be controlled, and a display terminal incorporating a CRT display device for executing only drawing (display). 3 and LA
In many cases, the plant 1 is monitored only by the display screen of the display terminal 3 connected to the transmission line 4 of the network such as N.

In this case, in addition to the CRT display device 4, a keyboard 5a, a mouse 5b, etc. are provided on the display terminal 3 so that an observer can monitor the graphic display screen and input necessary operation commands and operation data. An operation input device 5 is provided.

Input information such as operation commands and operation data input from the operation input device 5 is transmitted from the display terminal 3 to the control device 2 via the transmission path 4. The control device 2 monitors and controls the plant 1 based on the received input information. Also, the input information is displayed on the display terminal 3.

As described above, by simplifying the function of the display terminal 3, it is possible to use, as the display terminal 3, a general-purpose graphic display terminal sold as a low-priced version of the CRT display system.

[0007]

However, the monitoring and control system configured as shown in FIG. 8 still has the following problems to be improved. Since the above-mentioned inexpensive graphic display terminal does not have a built-in hardware for special duplication, if this inexpensive rough display terminal is installed in the supervisory control system of a plant where reliability is important, the entire supervisory control system There is a concern that reliability will be lost.

For example, in the case where the display terminal fails during the monitoring of a plant having a very high risk,
Since the supervisor cannot monitor the operating state of the plant, it can seriously affect the operation of the plant.

The present invention has been made in view of such circumstances, and by connecting two display terminals each having an operation input device to a control device via a transmission line, even if hardware for duplication is used. Even if you use an inexpensive display terminal that does not have built-in software, you can continuously monitor the control operation state of the control target without instantaneous breaks, and you can reliably input operation commands and operation data. It is an object of the present invention to provide a dual supervisory control system that can significantly improve the overall reliability.

[0010]

In order to solve the above-mentioned problems, the dual monitoring control system of the present invention monitors and controls the operating states of two display terminals each having an operation input device and a controlled object. A control device for graphically displaying the monitor control result on each display terminal is connected to the transmission line of the network.

Furthermore, each display terminal is provided with an input information transmitting means for transmitting the input information inputted from the operation input device provided in itself to the control device through the transmission path. Further, to the control device, display control means for displaying and outputting the monitor control result to each display terminal in the same format at the same time, and only the input information from one display terminal among the input information transmitted from each display terminal The input information selecting means for selecting and the operation control means for controlling the controlled object based on the input information selected by the input information selecting means are added.

Furthermore, in the redundant supervisory control system of another invention, in addition to the above-mentioned means, the supervisory control result received from another control apparatus connected to the transmission line of the network is sent to the control apparatus. Proxy display control means for displaying and outputting to the display terminal in the same format at the same time,
Input information transfer means for transferring the selected input information to another control device is added.

[0013]

In the dual supervisory control system thus constructed, the supervisory control results are graphically displayed simultaneously in the same format on the two display terminals connected to the transmission line of the network. Therefore, even if one display terminal fails, the monitoring control result can be monitored by the other display terminal.

Further, even if operation commands and operation data that contradict each other are input from the operation input devices of the two display terminals, for example, only the input information from the operation input device of the display terminal on the side designated as the master is displayed. Since it is accepted by the control device, the reliability of the entire system is further improved.

According to another aspect of the invention, reliability is improved when another general control device not having the above-mentioned duplex processing function is connected to the transmission line of the network.

That is, when this other general control device graphically displays the monitoring control result, first, the monitoring control result is transmitted to the control device having the above-mentioned duplex processing function. The control device having the duplication processing function, which has received the monitoring control result, graphically displays the monitoring control result on each display terminal in the same procedure as described above. Then, the input information from the operation input device is transferred to another general control device.

Therefore, also in a general other control device which does not have the duplication processing function, it is possible to perform the duplication display for the monitoring control result as in the control device having the duplication processing function.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing a schematic configuration of a redundant supervisory control system according to an embodiment.

A transmission line 1 of a network such as a LAN
Two display terminals 1 having the same configuration as the control device 12 having a redundant processing function for controlling the operating state of the plant 11
3, 14 are connected. In each of the display terminals 13 and 14, in addition to the CRT display device 15 for graphically displaying the monitoring control result in the monitoring device 12, the operator monitors the graphic display screen to perform necessary operation commands and operations. An operation input device 16 such as a keyboard 16a and a mouse 16b is incorporated so that data can be input.

Further, the transmission line 11 is connected to a general control unit 17 which does not have the above-mentioned duplex processing function. The control device 12 having the duplication processing function is configured, for example, as shown in FIG. That is, the control device 12 includes a monitoring control program 18 for monitoring and controlling the operating state of the plant 11 as a control target, a graphic display program 19, a data transfer processing program 20, a diagnostic program 21 for each display terminal 13, 14, and each. A data processing unit 22 including a CPU that executes various data processes according to the programs 18 to 21, a network control unit 23 that executes transmission / reception of data to / from the transmission path 10, and an input / output that performs input / output processing of various data to / from the plant 11. And a section 24.

A normal control device 17 having no duplication processing function has almost the same configuration as the control device 12 having the duplication processing function shown in FIG. The program content has a program configuration for controlling the display of only one display terminal. Moreover, the diagnostic program 21 is not provided.

Further, the respective display terminals 13 and 14 are shown in FIG.
As shown in FIG. 3, the data processing unit 25 that executes various data processing, the CRT display device 15 described above, and the keyboard 16a.
Operation input device 16 such as a mouse and a mouse 16b, and a transmission line 10
And a network control unit 26 that executes data transmission / reception.

The data processing unit 22 of the control device 12 having the duplication processing function in the duplication monitoring and control system having the above-mentioned configuration uses the programs 18 to 21 described above to perform various operations according to the flowcharts of FIGS. To execute.

First, when the power of the control device 12 is turned on, it is confirmed that the power of the entire system is turned on. Next, the diagnostic program 21 is used to execute the initialization process shown in FIG.

In order to use the two display terminals 13 and 14 at the same time in the flowchart of FIG. 4, first, the network control unit 23 is used to transmit the two display terminals 13 and 14 via the transmission line 10. Establishes a data communication path between and. Then, when the data communication path is normally established between both display terminals 13 and 14, the display terminal 13 is designated as "master" and the display Takamatsu 14 is designated as "slave". If either one is abnormal, only the normal display terminal is designated as "master". If both are abnormal, naturally there is no designation of “master” and “slave”.

The data control unit 22 uses the graphic display program 19 after establishing the communication path shown in FIG.
The display window is generated and the screen is drawn for the monitor control result of the monitor control processing using the monitor control program 18. The display terminals 13 and 1 are displayed according to the flow chart shown in FIG.
Display control for No. 4 is performed.

That is, when both display terminals 13 and 14 are normal, the graphic display data is sent to both display terminals 13 and 14 in the same format and at the same time as the monitor control result. If any one of the display terminals 13.14 is out of order at the time of outputting the display data, the display data is not output normally, and the process ends abnormally. In this case, the “master” stored in the data processing unit 22.
Change the "slave" designation and presence / absence information.

In the flow chart of the display control process shown in FIG. 5, whether or not there is a failure in each of the display terminals 13 and 14 is determined by whether or not the display (drawing) data is normally output. If the graphic display program 19 that is not updated is operating, the failure cannot be detected early. For this reason, the diagnostic program 21 is designed so that the time data is constantly output so that the failure can be detected early.

Further, the data processing section 22 of the control device 12 having the duplication processing function executes the operation input processing shown in FIG. Input information is input through the network control unit 23 from the operation input device 16 such as the keyboard 16a or the mouse 16b of either one of the display terminals 13 and 14 via the network transmission line 10. Then, only the input information from the display terminals 13 and 14 currently designated as the "master" can be received, the monitoring control program 18 is started based on the received input information, and the monitoring control for the plant 11 is executed. Further, the graphic display program 19 is started based on this input information, and the graphic display contents of the respective display terminals 13 and 14 are changed to contents corresponding to the input information.

Further, the data processing unit 22 of the control device 12 having the dual processing function has a display request of the monitor control result from another control device 17 not having the dual processing function and each display terminal 13.14. The data transfer program 20 is used to execute the data transfer processing on the input information from the following steps according to the flowchart shown in FIG.

That is, when the control device 17 having no duplication processing function graphically displays the monitoring control result, the two display terminals 13, 1 are directly connected from the control device 17.
Since the display (drawing) data cannot be transmitted to the control device 4, the display (drawing) data is transmitted to the control device 12 after the communication path is established with the control device 12 having the duplication processing function.

Upon receipt of the display request for the display (drawing) data from the control device 17 having no duplicated processing function, the control device 12 having the duplicated processing function executes the display (drawing) data according to the above-described processing procedure. Two display terminals 1
Output to 3 and 14 simultaneously. Therefore, each display terminal 13,
On the 14 CRT display device 15, the monitoring control result in the control device 17 is graphically displayed in the same format and at the same time.

The input data (information) input from the operation input device 16 of each display terminal 13 and 14 to the control device 12 via the transmission path 11 is "master" by the above-mentioned procedure.
Select only the input data from the display terminal specified as. Then, the selected input data is transferred to the display requesting control device 17.

As described above, the control device 17 not having the duplication processing function only changes the transmission destination of the display (drawing) data to the control device 12 having the duplication processing function in order to perform the graphic display. Terminals 13, 1
4 can be used simultaneously.

In the dual supervisory control system thus configured, the transmission line 10 of a network such as a LAN is used.
The monitor control results are graphically displayed in the same format and simultaneously on the two display terminals 13 and 14 connected to. Therefore, even if one display terminal 13 or 14 fails, the supervisor of the plant 11 can monitor the monitoring control result on the other display terminal.

Therefore, even if an inexpensive display terminal that does not have the duplexing hardware incorporated therein is used, the operating state of the plant 11 can always be accurately monitored, so that the reliability of the entire system can be improved.

Further, even if input information such as operation commands and operation data contradictory to each other is input from the operation input devices 16 of the two display terminals 13 and 14, the display terminal 13 on the side designated as "master". , 14 operation input device 16
Since only the input information from the device is accepted by the control device 12, the reliability of the entire system is further improved.

Further, even in the case of the general control device 17 having no duplication processing function, this control device 17 operates through the control device 12 having the duplication processing function, as if it were the control device 12 having the duplication processing function. , Each display terminal 1
3 and 14 can simultaneously display their own monitoring and control results graphically. Therefore, it is possible to provide a dual supervisory control system that is cheaper and can further improve reliability.

[0039]

As described above, in the dual supervisory control system of the present invention, two display terminals each having an operation input device are connected to the control device via a transmission line,
The control device graphically displays the monitoring control result on two display terminals in the same format and at the same time. Therefore, even if you use an inexpensive display terminal that does not have built-in hardware for duplication, you can continuously monitor the operating state of the controlled object without any momentary interruption, and reliably input operation commands and operation data. Therefore, the reliability of the entire system can be significantly improved.

[Brief description of drawings]

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

FIG. 2 is a block diagram showing a schematic configuration of a control device incorporated in the system of the embodiment.

FIG. 3 is a block diagram showing a schematic configuration of a display terminal incorporated in the system of the embodiment.

FIG. 4 is a flowchart showing the operation of the control device incorporated in the system of the embodiment when establishing a communication path.

FIG. 5 is a flowchart showing a display control process of the control device.

FIG. 6 is a flowchart showing an operation input process of the control device.

FIG. 7 is a flowchart showing a data transfer process of the control device.

FIG. 8 is a block diagram showing a schematic configuration of a conventional supervisory control system.

[Explanation of Codes] 11 ... Transmission line, 12 ... Control device, 13, 14 ... Display terminal, 15 ... CRT display device, 16 ... Operation input device, 17
... Control device, 18 ... Monitoring control program, 19 ... Graphic display program, 20 ... Data transfer processing program, 21 ... Diagnostic program, 22, 25 ... Data processing section, 23, 26 ... Network control section.

Claims (2)

[Claims] 1. A transmission line of a network comprising two display terminals each having an operation input device, and a control device for monitoring and controlling an operating state of a controlled object and graphically displaying the monitoring control result on each of the display terminals. In the dual monitoring control system, each display terminal transmits input information input from an operation input device provided in itself to the control device via the transmission path. The control device includes a display control unit that causes the respective display terminals to simultaneously display and output the monitoring control results in the same format, and from one display terminal of the respective input information transmitted from the respective display terminals. Input information selecting means for selecting only the input information and operation control means for controlling the controlled object based on the input information selected by the input information selecting means. Redundant monitoring and control system, characterized in that. 2. The proxy display control means for causing the display terminals to display and output the monitoring control results received from other control devices connected to the transmission path of the network to the respective display terminals at the same time, The redundant monitoring control system according to claim 1, further comprising input information transfer means for transferring the selected input information to the other control device.