SU752231A1 - Programmed regulator - Google Patents

Description

one

The invention relates to the field of experimental automation, research, in particular, the creation of automated process control systems based on multi-microprocessor networks.

A well-known decentralized digital control and information collection system, which includes a central | Q central processor, a central control panel, a control unit, a central information bus, and peripheral processors connected in parallel to the central bus.

Peripheral processors are located at users' workplaces and perform a number of special functions, namely, on command from a mini-computer, information is received, its control is performed. And the generation of control actions 1,

The central part of such a system is the universal software regulator .25

Known software controller.

containing computational device

(con

roystvo (microcomputer, which includes a central processor, a persistent storage device, onepa-jQ

memory device and timer), as well as an analog-to-digital converter with two normalizing amplifiers, a series of digital-to-analog converters, a buffer memory, a driver of digital control signals and a reprogrammable memory device connected to the micro-computer input-output device

However, the software controller must control various actuators, including thyristor converters, hydraulic servo valves, and many others that have the character of an inductive load. The above controller does not solve this problem.

On the other hand, the mathematical. the provision of this controller to the implementation, only a proportional control law, is absent, the system of emergency protection and detection of the malfunction of the microcomputer is absent ..

These shortcomings do not allow the dynamic range to be expanded, which reduces the accuracy and quality of adjustment of the npoiffeccoB technological.

The purpose of the invention is to improve the accuracy and quality of regulation. The goal is achieved by the fact that a software controller containing a computing device, the first input of which is connected to the output. the buffer memory block, the second input with the output of the analog-digital converter, the third input with the output for the remembering device, the first output of the computing device is connected to the first input of the analog-to-digital converter, the second output with the first input of the storage device, the third output - with the input of control signals, the fourth, fifth and sixth outputs - with the inputs from the first, second and third digital-to-analog converters, as well as the first and second, normalizing amplifiers, the third norm was introduced wiring amplifier, switch display unit and pulse-width modulator connected to the seventh output of the computing device, first output to the third, normalizing amplifier whose output is connected to the first input of the switch connected to the second and third inputs respectively, the first and second normalizing amplitudes., lei, the fourth input - with the eighth output of the computing device, and the output - with the second input of the analog-digital converter, the ninth output of the computing device connected to the input of the display unit. The drawing shows a block diagram of the regulator. The software controller contains a calculating device (microcomputer) 1, central processor 2, permanent memory 3, random access memory 4, that measures 5 g I / O device 6, buffer memory 7, memory device 8, driver 9 control signals, digital forehand transf. The detectors 10-12, the display unit 13, the pulse-width modulator 14, the analogue-to-digital converter 15, the switch 16 and the normalizing amplifiers 17-19. The developed control and monitoring program is stored in a persistent storage device. The activation of the control effect occurs according to the Jypls law) (sVx (s) + to uU (s) where is xiel Ualsi-.r Uo.,. La). ; Correction unit submission programs implement the six most common laws of regulation: W.O к - proportional (P); integro-differential; L / 2 (5) K (T, ZP) -. Proportional-differential (PD) for Wats) -. aperiodic link; / i 4 (e) k1; -4.i | - proportionally and fully integrated (PI); ilSb () Sc 5ik | m, 5 + - + il - proportional-integral-differential (FID). In addition, it is possible to switch the type of the correction link from P to PID and back to an external signal during the operation of the WES stop of the machine. The program of work provides for the reception of effects both numerically through the beffer memory 7 and in the analog farm through the normalizing amplifier 18, three-channel switch 16 and analog-to-digital converter 15. If the driver is in digital form, the controller can up to 3 feedbacks, and with an analog task - two. The number of feedback channels N is set before starting by setting a specific code in the service word recorded in the storage device 8. The controller works as follows. The memory number 8 is pre-recorded with the number of the selected corrective device, which provides optimal control of the object, the gain, the constant of the corrective element time, the quantization period, the threshold maximal tolerance of the error value, the controlled value, the type of response to the accident, the number of feedback channels the type of the driver (digital or analog) and the nature of the processing of the Lx signals (signed or alternating). According to the program recorded in the persistent storage device 3, the central processor unit 2 receives input information from the storage device 8 through the input-output device 6, places it in the operational storage device 4, generates a program, controller in accordance with the specified settings, calculating the correction factor of the correction factor and starting timer 5. Timer 5 transfers control of the controller program in 5 instants according to wherein the central processor unit 2 receives the driver action from the buffer memory 7, sequentially connects the outputs of the normalizing amplifiers 17-19 to the input Q of the converter 15 by means of the switch 16, starts the converter 15, realizing. the most consistent polling of the feedback channels; calculates the mismatch, compares it and the regulated value with the threshold values. If the specified parameters do not go beyond the permissible limits, the central processor 2 generates a control action in accordance with the selected correction element, which is fed through the input-output device 6 to the driver 9 and to the modulator 14, from where it goes to the control object. In this case, the signal in the form of voltage, proportional to the current output signal, from the output of the modulator 14 is fed to the input of the normalizing amplifier 19i and organizes current feedback, which allows a significant improvement in the accuracy and control quality in a wide frequency range. .

In addition, the central processor 2, via an input / output device 6, provides information to the converters 35 10-12 for registering a driver, error, and a controlled variable, as well as to the display unit 13, which improves the safety of the automated process control system.

Improving the accuracy and quality of technological regulation in the proposed regulation is the creation of a unified regulation of regulation with a large set of control laws. nor regulated by software; simplicity of interfacing with upper-level computers in hierarchical systems (control systems; the ability to automatically change operating modes, and setting coefficients by upper-level computer commands; the ability to use digital software devices without additional digital-to-analog converters; simplicity and high accuracy of setting variable tuning factors ; improving the stability of time characteristics; high accuracy of information processing; a combination of low cost standard Nogo products of mass production with the flexibility of custom device.

Claims (2)

1. The decentralized digital system, control and collection of information, Hey, Devices and elements of automation, 1976, 31. 2. Digital controller with to “KRO-COMPUTER, HE, -Devices and automation elements and computing, 1975. 25, (prototyp