JPS63317801A - Switch system for controlling set value - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a switching method/abnormality suppression method that detects an abnormality in a control set value used in a PID control circuit and quickly shifts to a normal value. .

[Conventional technology]

FIG. 2 is a block diagram of a conventional control circuit. Figure V (in which +11 is the process input signal, (2)
is a control setting value, (3) is a PID control circuit, and (4) is an operating end.

Next, the operation of the conventional circuit will be explained.

When the process input signal +11 fluctuates, the PID control circuit (3) operates the operating end (41) in accordance with the set value (2).

The process input signal 111 is generated by the movement of this operating end (4).
fluctuations will recover.

[Problems that Kokei attempts to solve]

Since the conventional circuit system is configured as described above, if a failure occurs in the set value circuit, the process input must be recovered quickly through manual operation by the operator, and the operator must perform monitoring and operation. There were problems such as the need for

This invention was developed in order to solve the above-mentioned problems, and it is an object of the present invention to provide a control circuit that can reduce the burden on the operator and prevent process fluctuations due to abnormalities in the set value circuit.

[Means for solving problems]

The switching system according to the present invention detects any abnormality in the control set value at an early stage, prevents transient changes in the control system, and prevents manual operation or judgment by the VC1 operator.

[Effect]

This switching system in the JV system is configured and functions by an electronic circuit or a software program.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to the drawings. 1st
In the figure, (11 is a process input signal, (2) is a control setting value, (31 is a PID control circuit, (41 is an operating end, (
51 is a switching circuit, and (6) is an abnormality detection circuit.

The operation of this invention will be explained with reference to FIG.

The control set value (21 is constantly monitored by the abnormality detection circuit (6). If the set value is determined to be abnormal, the switching circuit +51
This system switches to a healthy system and prevents unnecessary operation of the PrD control circuit (3).

As a result, it is possible to prevent the influence on the process due to an abnormality in the control set value, and also to reduce the burden of process monitoring and operation.

In addition, although the above embodiment shows a system in which control set values are constantly monitored and automatically switched, ■ Multiplexed process signal selection/exclusion switch and interface circuit ■ Conversion from momentary contact to alternate contact Even if it is diverted to circuits, etc., it will reduce the amount of operation, unify two models, etc.
The same effects as in the above embodiment are achieved.

〔Effect of the invention〕

As described above, according to the present invention, the control setting value/process signal switching method is modularized and configured, which reduces the burden on the operator, suppresses fluctuations in process values, and unifies nine models. effective.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of the present invention, and FIG. 2 shows the configuration of a conventional control device. +11 is the process input signal, (2) is the control setting value, (3
) is a PID control circuit, (4) is an operating end, (5) is a switching circuit, and (61 is an abnormality detection circuit). Note that the same reference numerals in the figures indicate the same or corresponding parts.

Claims (1)

[Claims] The present invention is characterized by having a system that detects an abnormality in the control set value in a PID control circuit that controls the operation of the operating end according to changes in process values and changes in the control set value, and switches it to a normal value. Control setting value switching method.