JPH03294907A - Digital controller - Google Patents

Abstract

PURPOSE:To efficiently and surely execute the logic test by making an input from an operating switch invalid, and also, displaying a fact that a function test of a plant apparatus is being executed, when simulation data is being inputted. CONSTITUTION:At the time of shifting to a logic test work of a motor-driven valve 2 from a regular time, a state pilot lamp of the motor-driven valve 2 becomes a flickering state from continuous lighting, and a message in the course of a logic test is transmitted automatically to an operator. Also, even if the operator operates an operating switch 9 by an erroneous decision, although the message in the course of a logic test is outputted, its signal becomes invalid by an operation input switch part 22. In such a way, the logic test can be performed efficiently and surely.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to a digital control device for controlling plant equipment such as a power generation plant.

(Conventional technology) Plants, such as power plants, have a huge number of devices such as pumps, valves, fans, etc. These devices are equipped with digital control devices designed and manufactured according to the functional requirements of each system. It is controlled and operated by.

Furthermore, in plants where high reliability is required, such as nuclear power plants, it has become common to periodically conduct functional tests (hereinafter referred to as logic tests) of digital control devices. Digital control devices installed in such plants are equipped with a function for performing logic tests.

FIG. 2 shows the configuration of a digital control device that controls an electric valve as an example of such a conventional digital control device.

As shown in this figure, the digital control device 1 includes a control logic section 3 for controlling the electric valve 2 and a simulated data switching section 4.

The simulated data switching section 4 is provided with a switching device 5, and this switching device 5 is configured to input a valve full-open command signal 6a from the signal coupling device 6 to the control logic section 3 under normal conditions. ing. Then, the test permission signal 7a outputted from the test permission switch 7 to the simulated data switching unit 4,
Simulated input point signal 8b output from the simulated data setter 8
When inputted, the switching devices are switched and the simulated data 8a from the simulated data setting device 8 is inputted to the control logic section 3.

The control logic unit 3 also includes a valve fully open command signal 6a.
Logic is provided in which the condition is met by negation of the valve fully closed signal 9a outputted by the valve operation switch 9, and the electric valve 2 is fully opened. In addition, the control logic section 3 controls when the valve fully open signal 9a is established by operating the valve operation switch 9.
Fully open the electric valve 2.

Furthermore, the control logic unit 3 controls the electric valve 2 to open when the electric valve 2 is not fully closed.
Limit switch AIO that turns ON and turns ON when not fully open.
In response to a signal from the limit switch Bll, a signal 12a indicating that the valve is not fully closed and a signal 12b indicating that the valve is not fully open are output to the status indicator lamp 12, so that the status of the valve can be monitored using the status indicator lamp 12. There is.

Here, when performing a logic test in which the electric valve 2 fully opens by simulating the valve full-open command signal 6a, which is an actual input signal, the test permission switch 7 is operated to generate the test permission signal 7a, and the simulation data is set. A simulated input point signal 8b (in this case, an input point signal of a valve fully open command) and simulated data 8a are inputted into the device 8. With these two conditions satisfied,
The switch 5 of the simulated data switching section 4 is activated, the control logic section 3 is operated based on the simulated data 8a, and the control device 1 issues a full open command to the electric valve 2. When the electric valve 2 operates to the full open side, the limit switch AIO turns ON and the status indicator light 12 lights up. The soundness of the logic is confirmed through this series of operations.

During this logic test, if a closing operation is performed using the valve operation switch 9, the state of the electric valve 2 will change from the fully open side to the closed direction, which will not only make it impossible to confirm the soundness of the logic, but also cause damage to the plant depending on the equipment. It is possible that it may have a negative impact. Therefore, before the logic test, an operation stop tag 13 is placed on the valve operation switch 9 to inform the operator that the test is in progress and to prevent erroneous operation.

(Problem to be solved by the invention) However, logic tests such as those described above are often performed in a concentrated manner over a short period of time.

Furthermore, in plants, many equipment operation switches are often installed on the same control panel for the purpose of centralized monitoring and control.

Under such circumstances, when conducting a logic test, it takes a considerable amount of time to select device operation switches and create operation prohibition holes. Furthermore, there is a possibility that mistakes such as forgetting to insert the operation prohibition hole or inserting the wrong hole may occur. Furthermore, even if there is an operation prohibition hole,
There is also the possibility that operations may be carried out due to misjudgment by operators, which may have a negative impact on the plant.

The present invention has been made in response to such conventional circumstances, and allows logic tests to be carried out more efficiently and reliably than in the past, and in the unlikely event that a device operation switch is operated during a logic test. The object of the present invention is to provide a digital control device that can prevent logic test work from being interrupted or adversely affecting the plant.

[Structure of the Invention] (Means for Solving the Problems) That is, the digital control device of the present invention includes a control logic section that controls plant equipment according to operation numbers from operation switches and actual signals from the outside, and a simulated data switching unit that switches a signal input to the logic unit between the actual signal and simulated data; an operation input switching unit that disables input from the operation switch while inputting the simulated data; The present invention is characterized by comprising a display output section that displays a message indicating that the plant equipment is undergoing a functional test during input.

(Function) In the digital control device of the present invention having the above configuration, during the input of simulated data, the plant equipment is undergoing a functional test (logic test) by, for example, changing the status indicator light from a continuous lighting state to a blinking state. Since a display output section is provided to display this, it is possible to notify the operator that the function test is being carried out without the need for work such as installing an operation prohibition hole. Therefore, logic tests can be performed efficiently and reliably.

In addition, during input of simulated data, there is an operation input switching section that disables the input from the operation switch, so even if the equipment operation switch is operated due to an operator's misjudgment, the logic test will not be interrupted. It is possible to prevent the plant from being adversely affected.

(Example) Hereinafter, details of the digital control device of the present invention will be described with reference to the drawings.

FIG. 1 shows the configuration of a digital control device according to an embodiment of the present invention for an electric valve. The same parts as the conventional digital control device shown in FIG. 2 are given the same reference numerals. be.

The digital control device 21 of this embodiment displays the control logic unit 3 for controlling the electric valve 2, the simulated data switching unit 4, the operation input switching unit 22, and the fact that the plant equipment is undergoing a functional test. It is composed of a status display switching section 23 that constitutes a display output section.

The operation input switching section 22 is provided with a switch 24, which is connected to the test permission signal 7a output from the test permission switch 7 and the simulated data setting device 8.
The input from the operation switch 9 is invalidated when the condition of the simulated input point signal 8b outputted from the operation switch 9 is satisfied.

The status display switching section 23 also has a flicker function 25.2.
6 and switching devices 27 and 28 are provided. The flicker function 25, 26 is for making the status indicator light 12 blink, and the switch 27, 28 is for controlling the test permission signal 7a output from the test permission switch 7 and the test permission signal 7a output from the simulated data setting device 8. When the condition of the simulated input point signal 8b is met, the input to the status indicator lamp 12 is switched from the normal route to the route via these flicker functions 25 and 26.

When performing a logic test on the digital control device of this embodiment with the above configuration, the test permission switch 7 is set to the test permission position, and the simulated data setting device 8 is used to send the simulated input point signal 8b (in this case, the input point of the valve fully open command). When the signal) is specified, the switching condition in the simulated data switching unit 4 is established, the switch 5 in the simulated data switching unit 4 is switched, and it becomes possible to input the simulated data 8a from the simulated data setting device 8. . The control logic unit 3 operates based on this simulated data 8a and outputs a fully open command to the electric valve 2.

Furthermore, when the switch 5 of the simulated data switch 4 is operated, the switch 27, 28 in the status display switch 23 is also switched to the flicker function 25, 26 at the same time, and the output signal to the status indicator 12 is It changes from a light state to a blinking state. Thereby, when the status indicator light 12 changes to a blinking state, the operator can recognize that the control logic of the corresponding device is being tested.

Further, when the switch 5 of the simulated data switch section 4 is operated, the switch 24 of the operation input switch section 22 is also switched, and the operation switch 9 is disconnected from the control logic section 3.

Therefore, even if the operation switch 9 is operated, the valve fully closed signal 9a is invalidated.

That is, according to the digital control device 21 of this embodiment, when transitioning from normal operation to logic test work of the motor-operated valve 2, the status indicator light 12 of the motor-operated valve 2 changes from a continuous light to a blinking state, prompting the operator to conduct a logic test. The messages inside will be conveyed automatically and reliably.

Furthermore, even if the operator operates the operation switch 9 due to a misjudgment even though a message indicating that the logic test is in progress is being output, the operation input switching section 22 will invalidate that signal and the logic test operation will be interrupted. , it is possible to prevent adverse effects on the plant.

In the above embodiment, the status indicator light 12 of the device blinks to indicate that the logic test is in progress, but for example, if the device does not have a status indicator light 12, a dedicated indicator light may be provided. Configure it to display the same.

In addition, the display method is not limited to flashing lights, but by using two types of light emitting bodies in the indicator light and adding a circuit that switches the emitted color with a switch, it is possible to distinguish between normal conditions and logic test conditions. It is also possible to Similarly, it is also possible to collectively display the output light during the logic test on a CRT or printer device.

In addition, the simulated data setting device 6 is incorporated into the control device 21,
It is also possible to perform simulation using the control device 21 alone.

[Effects of the Invention] As explained above, according to the digital control device of the present invention, it is possible to perform logic tests more efficiently and reliably than in the past, and in the unlikely event that equipment operations are performed during logic tests. Even if the switch is operated, logic test work can be prevented from being interrupted and the plant can be prevented from being adversely affected.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing the configuration of a digital control device according to an embodiment of the present invention, and FIG. 2 is a diagram showing the configuration of a conventional digital control device. 2・・・・・・・・・・・・Electric valve

Claims (1)

[Scope of Claims] A control logic unit that controls plant equipment in accordance with operation numbers from operation switches and actual signals from the outside; and a control logic unit that combines signals input to the control logic unit with the actual signals and simulated data. a simulated data switching section for switching; an operation input switching section for disabling input from the operation switch while inputting the simulated data; and a display indicating that the plant equipment is undergoing a functional test while inputting the simulated data. A digital control device characterized by comprising a display output section.