JPH0287202A - Adjusting device - Google Patents

Abstract

PURPOSE:To easily execute many control systems by decoding a condition discriminating signal in an arithmetic part when the condition discriminating signal such as target value information, etc., is inputted from an external part, judging which control rule the condition is related to form the target value information, and executing arithmetic according to the specified control rule. CONSTITUTION:When the condition discriminating signal is inputted from the external part through an external interface 14, an arithmetic part 12 decodes the condition discriminating signal and selects one control rule on the basis of a decoded result out of the plural control rules which are stored in a storing part 15. Afterwards, an input signal is inputted from a signal input part 11 to the arithmetic part 12 in correspondence to the operation of a plant. However, here, the arithmetic part 12 executes the arithmetic according to the execution order of the selected control rule and an output signal, which is obtained by the result of the executed arithmetic, is supplied through a signal output part 13 to an operation edge. Then, the plant is controlled. Thus, many control systems can be executed with simple constitution.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to a regulating device used in a process instrumentation system and the like, and particularly to a regulating device that performs multi-function control.

(Prior art) Conventional general process control systems include a feedback control system mainly based on PID control, and a feedforward control system that detects disturbances and cancels the effects of the disturbances in advance (Japanese Patent Publication No. 1604/1983). , feedforward/feedback control methods that combine these are used, but in recent years, methods that apply artificial intelligence such as fuzzy control or expert systems and modern control theories such as multivariable control have been used. Method etc.
In addition to conventional simple PID control, control systems that are more advanced than PID control, called so-called advanced control, are being widely used.

(Problem to be Solved by the Invention) By the way, among the various control methods mentioned above, control methods that use a lot of mathematical formulas, such as fuzzy control or multivariable control, are different from POL used in conventional programmable controllers. Program-OrientedLa
A modular system construction language called nguage (problem-oriented language) has insufficient numerical accuracy and computational expression to realize the algorithm. In addition, when applying fuzzy control, it is necessary to write a fuzzy control law according to the applicable plant, and the fuzzy control law can be modified until it becomes the optimal control law for the characteristics of the plant. Although it is desirable to be able to easily change the settings, it is complicated in conventional POL.

For example, as an example of POL, the member shop function f(x)
Even when writing a simple formula such as =1/fl+aσ(x-xO) 21 , it is complicated and some parameters are not used, resulting in a wasteful program. Furthermore, if an attempt is made to implement a control method that makes extensive use of matrix calculations, such as multivariable control, with conventional POL, it is difficult to implement it due to limitations such as the number of registered modules.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide an adjustment device that realizes a large number of control methods including advanced control such as fuzzy control and multivariable control with a simple configuration.

[Structure of the Invention] (Means for Solving the Problem) In order to achieve the above object, the adjustment device according to the present invention includes a signal input section and a signal output section, and outputs an input signal input from the signal input section. In the control device, a plurality of control laws are stored, and a plurality of control laws are stored, and these control laws can be transmitted from the outside. a storage section that stores information in a readable and writable manner; a condition signal input means that inputs a condition determination signal from the outside; and a condition signal input means that decodes the condition determination signal inputted from the condition signal manual means and executes the control law based on the decoding result. and an arithmetic unit that selects and executes an arithmetic operation.

(Function) Therefore, by taking the above-mentioned measures, the present invention stores various control laws in the storage section, and when a condition discrimination signal such as vote value information is inputted manually from the outside, the calculation section By decoding the condition discrimination signal, determining which control law it relates to from the target value information, and executing calculations according to the control law specified by the determination,
This allows for easy implementation of multiple control methods.

(Example) Hereinafter, an example of the present invention will be described with reference to the drawings. FIG. 1 is a diagram showing a schematic configuration of the apparatus of the present invention, in which reference numeral 11 denotes continuous or discrete process analog signals AIl to AIk and digital signals DIl to Dll.
(hereinafter collectively referred to as input signals), the input signal from this signal input section 11 is input to the calculation section 1.
2 will be introduced. This calculation unit 12 includes continuous or discrete analog signals AOI-AOm and digital signals DOI.
In addition to the signal output unit 13 that outputs ~Don (hereinafter collectively referred to as an output signal), an external interface 14 as a condition signal input means, a storage unit 15, etc. are connected.

The condition signal input means has a function of manually inputting a condition determination signal, such as target value information, from an external interface 14, such as a keyboard, and transmitting it to the calculation section 12.

The storage section 15 is configured to store a plurality of control laws and to be able to read and write the stored contents in response to external read and write signals. Note that the control law is, for example, an algorithm based on a simple PID calculation, and includes correction calculations for output signals, etc., as necessary.

The arithmetic unit 12 decodes the condition discrimination signal, selects a specific one from a plurality of control laws based on the decoding result,
It has a function of receiving the input signal, executing a calculation based on the control law, and controlling the operating end using the signal of the calculation result via the signal output section 13.

Next, the operation of the apparatus configured as above will be explained.

First, when a condition determination signal is input from the outside through the external interface 14, the calculation unit 12 decodes the condition determination signal and selects one of the plurality of control laws stored in the storage unit 15 based on the decoding result. Select control law.

After that, an input signal is input from the signal input section 11 to the calculation section 12 according to the operation of the plant.
5 controls the plant by executing calculations in accordance with the execution procedure of the selected control law and supplying an output signal obtained as a result of the execution calculations to the operating end through the signal output section 13.

Next, FIG. 2 shows an embodiment applied to general process control, in which when a target value signal SVI as a condition determination signal is input from the outside, the calculation unit 12 converts the target value signal SVI into After receiving the information and decoding its contents, one control law is selected from among the plurality of control laws stored in the storage unit 15. Thereafter, when the process detection signal PVI is input, the calculation unit 15 executes calculation by applying the selected control law, and calculates the operation output MV obtained from the calculation result.
I is applied to a control valve (not shown) to adjust the opening degree.

Therefore, according to the embodiments described above, a plurality of control laws that can be read and written from the outside are stored, and an appropriate control law is selected according to the condition determination signal from the outside to perform calculations. Even control and invariable control can be easily executed, and control can be multifunctional.

In the above embodiment, a plurality of control laws are stored in the storage unit 15, but a configuration may be adopted in which a plurality of control laws are packaged and stored, for example, as shown in FIG. In addition, the present invention can be implemented with various modifications without departing from the gist thereof.

[Effects of the Invention] As detailed above, according to the present invention, a large number of control methods including advanced control such as fuzzy control and multivariable control can be realized with a simple configuration, and multifunctional control can be realized. A water adjustment device can be provided.

[Brief explanation of drawings]

1 to 3 are shown to explain an embodiment of the adjustment device according to the present invention, FIG. 1 is a schematic configuration diagram of the device of the present invention, and FIG. 2 is a general process control FIG. 3 is a state diagram in which a plurality of control laws are packaged and stored in a storage unit. 11... Signal input section, 12... Arithmetic section, 13...
Signal output section, 14... External interface, 15...
・Memory section. Applicant's agent Patent attorney Takehiko Suzue

Claims (1)

[Scope of Claims] It has a signal input section and a signal output section, executes an operation using an input signal input from the signal input section, and transmits a signal resulting from the operation execution to an external operation through the signal output section. In a regulating device that controls a process by applying a signal to an end, a storage unit stores a plurality of control laws and stores these control laws in a readable and writable manner from the outside, and a condition signal that introduces a condition determination signal from the outside. An adjusting device comprising: an input means; and a calculation section that decodes the condition determination signal inputted from the condition signal input means, selects the control law based on the decoding result, and executes the calculation. .