JPS6130281B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a process control device, and more particularly to a protection system for a process control device that displays and controls the status of process equipment in a nuclear power plant using an interactive display device and a computer.

Interactive display devices (light pen, keyboard, etc.)
With the recent development of computer control technology, a method of driving and controlling processes via an electronic computer using a CRT display device, a plasma display device, etc.) as a peripheral device of an electronic computer has been widely used. For example, a process control device in a nuclear power plant as shown in FIG. 1 can be considered. In the figure, a nuclear power plant process 1 includes a reactor recirculation pump 3, a recirculation pump inlet valve 5, a recirculation pump outlet valve 4, a feed water flow rate valve 6, and a main steam isolation valve 7, as examples of main components. , main blocking valve 8, regulating valve 9, turbine bypass valve 10, turbine 19, condenser 18, generator 20, feed water heaters 11, 13,
There are a water supply pump 12, condensate pumps 14 and 17, a demineralizer 15, and the like. The status of these process equipment is
The data is read into the arithmetic and control unit 23 via the process input/output device 22 of the electronic computer 21 and is subjected to arithmetic processing.

The output of this arithmetic control device 23 is the display control device 2
5 on the display device 26 and informed to the plant operator.

Here, the plant operator uses the light pen 27 based on the information displayed on the display device 26.
etc., the output of the electronic computer 21 is output to the plant process 1 side to drive and control process valves, pumps, and other process equipment.

As can be seen from the above, the main point of the drive control method in the computer control device for such a process is to transfer the operation signal from the light pen 27 to the computer control device 2.
3, to perform arithmetic processing and output to the plant process 1 via the process input device 22. For this reason, the arithmetic control device 23, the storage device 2
4. Due to a failure of the process input/output device 22, etc.
An operation signal that is different from the operator's intention may be output to the process, and process equipment may be operated erroneously.

The present invention has been made in view of the above-mentioned circumstances, and provides a process control device that prevents the drive control target from malfunctioning due to computer failure, etc. when controlling the drive of process equipment using an interactive display device. The purpose is to

In order to achieve this object, the present invention includes a display device such as a CRT display for displaying plant process information, and an input device such as a light pen for inputting operation commands for process equipment corresponding to the information displayed on the display device. a display control device that controls the operation of the display device and outputs operation signals and operation confirmation signals based on operation commands; and a drive signal that performs predetermined calculations based on the operation signals and drives the process equipment. , consisting of a storage device, an arithmetic control device, a process input/output device, etc., which outputs an operation permission signal indicating whether the process equipment is operable or not, and a normal operation signal indicating whether or not it is performing normal arithmetic processing operations. and an output logic circuit that performs an AND operation on an operation confirmation signal, a drive signal, an operation permission signal, and a normal operation signal, and drives a process device based on the output signal of the output logic circuit. It provides:

Embodiments of the present invention will be described below with reference to the accompanying drawings. Note that the same reference numerals in each drawing indicate the same objects.

FIG. 2 shows an embodiment of this invention,
The case where the condensate pump 17 is controlled is shown. Here, the electronic computer 21 shown in FIG. 1 is shown in more detail, and in particular, according to the present invention,
The process input/output control device 22 includes a process input device 22a, a process output device 22b, and an output logic circuit (interlock circuit) 22c. The process input/output device 22a receives a signal M corresponding to the rotation speed etc. from the motor 17a that drives the pump 17, and the process output device 22b has an output logic driven by the output signal F of the arithmetic and control device 23. Signals E and G are sent to AND circuits 211 and 212 of circuit 22c. That is, the output logic circuit 22c includes three AND circuits 211, 212, 21
3, the AND circuit 211 receives the output signal E of the process output device 22b and the output signal D of the arithmetic control device 23, and the AND circuit 212 receives the output signal (drive signal) G of the process output device 22b and the output signal D of the AND circuit 211. The output signal H is input, and the AND circuit 213 also receives the output signal J of the AND circuit 212 and the output signal (operation confirmation signal) X of the display control device 25. Therefore, the AND circuit 213
When the logical conditions are met, the control signal K from the arithmetic and control unit 23 is input to the drive circuit 220, and this circuit 220 controls the motor 17a and hence the pump 17 by a predetermined output L. As will be understood from this, the operation confirmation signal is an interlock signal of control signals output from the display control device as a result of operating the display device 26 with the light pen 27. The case where the light pen 27 is operated will be described below.

A signal φ generated by operating the light pen 27 is transmitted to the display control device 25 via the display device 26. This signal φ is further transmitted as a light pen operation signal B to the arithmetic and control unit 23. Further, an operation signal (operation command) N of the light pen 27 is transmitted to the arithmetic and control device 23 as an operation signal P via the display control device 25 . The operation signals B and P transmitted to the arithmetic and control device 23 are used to perform arithmetic processing according to the arithmetic processing method stored in the storage device 24 in advance. Here, the signal φ is a control device discrimination (device selection) signal, and the signal N is a control command signal (trigger signal).

The manner in which these signals φ and N are generated will be explained in more detail. For example, the display device 26
It is assumed that devices are displayed on the screen as shown in FIG. Now, in order to operate the drive motor 17a of the pump 17, the motor 1 of the display device 26 must be
7a on the screen of the display device 26 with the light pen 27. Here, the light pen 27 is operated toward the screen as shown by the arrow α in FIG. Here, as shown in FIG. 4, for example, the light pen 27 has a light transmitting part 271 made of a glass fiber that guides light and a reed switch 272, and a spring 277 provided in a part of the light transmitting part 271. A magnet 27 provided at the end of the supported sliding portion 276
3, the reed switch 272 is operated to obtain the signal N from the lead wire 274.

Thus, by operating the light pen 27 as described above, the reed switch 272 is brought into a closed state. Signal line 27 when reed switch 272 is closed
4 as a control command signal N to the display control device 2.
5. When the operation signal P is transmitted from the display control device 25 to the arithmetic and control device 23, the arithmetic and control device 23 issues an instruction signal to read the position of the light pen 27 on the screen of the display device 26. As a result, the display device 26
The screen is scanned, and this scanning line is read into the arithmetic and control device 23 as a position (x, y) on the screen via the glass fiber a of the light pen 27, the light transmission section 271, and the display control device 25. This position (x, y)
The selection of equipment is determined by the arithmetic and control unit 23. Further, the operation signal N is amplified into a signal P and a signal X by the display control device 25. An example of the circuit is shown in FIG. Light pen 27 reed switch 2
Reed switch signal line 2 connected to contact point 72
Connect power source P1 to one end of 74 as a power source for relay R, and connect the other end to the common bus line of the power source via relay R.
The contacts R ₁ and R ₂ of this relay R, which are connected to NO, are used as the signal P. On the other hand, connect contacts R3 and R4 to signal
used as

The signal processed as described above by the display control device 25 is further processed as follows. That is, the signal processed by the display control signal 25 is processed by the calculation control device 23, and the result is sent to the output theoretical circuit 22c via the process output device 22b as a control signal F for driving the condensate pump 17. It is applied as input G of the AND circuit 212. on the other hand,
The signal D indicating whether or not the arithmetic and control unit 23 is operating normally is output logic as the logical product of the results such as that the power supply of the electronic computer 21' is normal and that no parity error has occurred in the storage device 24. It is applied as an input to the AND circuit 211 of the circuit 22c. Further, the permission signal E for operating the process equipment by the electronic computer 21' is processed according to the calculation contents stored in advance in the storage device 24, and is output as the operation permission signal E as an input to the AND circuit 211 of the logic circuit 22c. applied. The signal φ and the signal E are processed by an AND circuit 211, and
It is applied as the operable signal H as an input to the AND circuit 212 of the output logic circuit 22c. The AND circuit 213 of the output logic circuit 22c outputs the logical product of the drive signal G and the operable signal H inputted to the AND circuit 212 of the output circuit 22c as the control signal J.
is input.

In this invention, the operation signal N of the light pen 27 is inputted to the AND circuit 213 as the operation signal X via the display control device 25, or
Input the operation signal N directly to the AND circuit 213,
Performs a logical product operation and outputs the result to the output logic circuit 22c.
The output signal K is the output signal K. Signal K
is further input to the motor drive circuit 220 and is the drive output L of the motor 17a that drives the pump 172.
shall be. The operation of the motor is controlled by sending a signal C as an operation signal M to the arithmetic and control unit 3 via the process input device 4.
is read as . The arithmetic and control unit 23 compares the drive output signal F and the operation confirmation signal C,
The result of the operation using the light pen 27 is confirmed.
According to this invention, when driving the pump 17 with the operation signal of the light pen 27, the electronic computer 2
It is possible to prevent the pump 17 from being erroneously driven in response to the control output G that is erroneously generated due to a failure of the storage device 24, the arithmetic control device 23, the process output device 22b, etc., which are the components of the pump 1'. .
That is, by directly employing the operation signal of the light pen 27 as an interrotter signal with respect to the drive signal of the pump 17, it is possible to prevent the process from being erroneously driven even when the operator does not operate the light pen 27. In this case, the output logic circuit 22
In order to obtain the output signal K of c, a single failure of all components of the electronic calculator 21' and all components except the AND circuit 213 of the output logic circuit 22c will not cause the signal to be generated. Regarding the failure of the remaining AND circuit 213, it is often used.
By duplicating elements using the 1 out of 2 method, malfunctions due to single failures can be easily avoided.

FIG. 6 shows another embodiment of the present invention, in which the operation confirmation signal X may be sent separately from the operation of the light pen 27 by a push button switch 600a provided on the operator console 600. good.

As described above, according to the present invention, the control signal for controlling the process equipment is interlocked with the operation confirmation signal, so that the plant can be directly driven by the computer using the interactive display control device. In such a case, even if an erroneous operation signal is given to the electronic computer, it is possible to prevent the process equipment from malfunctioning. Furthermore, since the control signal is interlocked even with the normal operation signal, even if the electronic computer or the like malfunctions, it is possible to prevent the process equipment from malfunctioning. As a result, even if the number of computers and related devices increases, it becomes possible to control a single failure without reducing reliability. Particularly, in plants such as nuclear power plants that require stability and reliability, it is essential to employ the interlock according to the present invention to ensure reliable operation. It goes without saying that the present invention is not limited to the above-mentioned example, but can be applied to all types of process control using an interactive display device.

[Brief explanation of the drawing]

Fig. 1 is a system diagram of a conventional process control device, Fig. 2 is a system diagram of an embodiment of the present invention, Figs. FIG. 6 is an explanatory diagram of another embodiment of the invention. 1...Plant process, 2...Nuclear reactor, 3,
12, 14, 17... pump, 4, 5, 6, 7,
8,9,10...Valve, 11,13...Feed water heater, 15...Demineralizer, 18...Condenser, 19...
Turbine, 20... Generator, 21, 21'... Electronic computer, 22... Process input/output control device, 2
3... Arithmetic control device, 24... Storage device, 25...
...Display control device, 26...Display Ray device,
27...Light pen.

Claims (1)

[Claims] 1. A display device for displaying plant process information, an input device for inputting operation commands for process equipment corresponding to the display information of the display device, and an input device for controlling the operation of the display device and based on the operation commands. a display control device that outputs an operation signal and an operation confirmation signal; a drive signal that performs a predetermined calculation based on the operation signal to drive the process equipment; and a drive signal that indicates whether or not the process equipment can be operated. means for outputting an operation permission signal and a normal operation signal indicating whether or not the operation processing operation is normally performed; and the operation confirmation signal, the drive signal,
A process control device comprising output logic means for performing an AND operation on an operation permission signal and a normal operation signal, and driving a process device based on an output signal of the output logic means.