SU1314304A1 - Control device for control loop - Google Patents

Abstract

This invention relates to automatic control systems. The goal is to increase reliability. The device contains regulator 1, sensor 2, actuator (s) 3, alarm 4, computing unit 5, indicator 6, switching unit 7, analog and discrete electropneumatic converters 8 and 9, pneumatic collector 10, pneumorele 11, pneumo-capacitance 12, power amplifier 13 , throttle 14. The regulator 1 operates in three modes: manual, when the signal from its output immediately enters the IM 3 from the regulator sensor; automatic, when the signal at MI 3 is generated by the controller depending on the task set by the operator: software, when the signal from controller 1 supplied to MI 3 is formed depending on the task coming from block 5. 1 Il. i (L

Description

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The invention relates to automatic process control systems, where automatic control systems are made on pneumatic automation elements and are used in a control mode from a computer.

The drawing shows a functional diagram of the proposed device.

The device contains a regulator 1, a sensor 2, an actuator 3, a signaling device 4, a computing unit 5, an indicator 6, a switching unit 7, an analog electropneumatic converter (EF) 8, a discrete electropneumatic transducer (EF) 9, an pneumo-electric converter (PE) 10 , pneumorel 11, air capacity 12, power amplifier 13 and throttle 14.

The device works as follows.

Regulator 1 can operate in three modes: manual, when the control signal to the executive

mechanism 3 comes directly from for, p, atchik regulator; automatic, when the control signal supplied to the actuator 3 is generated by the controller depending on the reference set by the process operator; software, when the signal supplied to the actuator 3 is generated depending on the task coming from block 5.

In the initial state, the controller 1 is in the automatic mode. The task signal from controller 1 through the block .7 and the PE 10 enters the input of the block 5, which forms at its second output a signal equal to the task signal of the controller 1, and sends the command to discrete EP 9, which commutates the switching unit 7. After that, the signal from the second output of block 5 through EP 8, the second input pneumorele. 11 (the first input is locked) and the air capacity 12 enters the input of the amplifier 13 of the sensor, from the output of which the amplified signal goes through the switching unit 7 to the software input of the controller 1 and through the PE 10 to the input of the unit 5, which checks the incoming signal for equality the signal of the setpoint of the regulator 1. In the case of inequality of the signals on the indicative 6, a message is returned and the device is reset.

If the signals from block 5a are equal, indicator 6 receives a message.

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where the operator technician performs an unstressed transfer of the controller to the programmed control mode, about which from controller 1 to block 5 through

The annunciator 4 receives a message, after which, from the output of block 5, a command is sent to the discrete EP 9, which sends a signal to the control input of the pneumorel 11. The second input

pneumorel 11 will be locked, and the first is open. Due to the tightness of the lines between the outlet of the pneumorele 11 and the input of the amplifier 13, a signal equal in pressure to the signal will be maintained

task formed by block 5.

The power-amplified signal from the output of the amplifier 13 through the switching unit 7 will go to the software input of the controller 1 and through the PE 10 to

block 5 input for control. At the same time, the signal from the output of the power amplifier 13 through the choke 14 will go to the first input of the pneumorel 11. The choke 14 is configured in such a way that

at the input of the amplifier 13 will be how much

the signal, equal in pressure to the signal generated by block 5, will remain for a long time, but the block 5 itself and the analog DF 8 will be disconnected from

software input of the regulator 1 bla- | Godard locked the second input pneumorele 1 1.

If necessary, change the value of the signal setting of the regulator 1

at the command of block 5, discrete DF 9 is sent to the control input of the pneumorel 11 by a signal that opens the second and closes the first inputs of the pneumorel 11. The second output

unit 5 through pneumorele T1, air capacity 12, amplifier 13 and switching unit 7 is connected to software input of controller 1. Unit 5 generates a new value of the reference signal

controller 1, controlled through PE 10, after which, according to the above-described sequence, input 2 closes and input 1 opens at pneumorel 1 1., then at the input of amplifier 13 will be indefinitely long

preserve the signal equal in pressure to the newly formed signal by the block 5; Thus, the program input of the regulator 1 will receive a new

signal of the task, but at the same time block 1 and EP 8 will be disconnected from the software input of the controller 1.

The main operating time in software mode regulator 1 is in

the waiting state of the new signal of the task generated by block 5. The time taken for the controller 1 to move to a new position when its software input is connected to the computing unit is extremely insignificant. So how is the software; the input of the regulator 1 in the standby mode is pneumatically cut off (developed) from block 5 and EP 8 by the locked second inlet of the pneumorele 11, then the occurrence of arising voids is practically excluded; actions caused by hardware failures of block 5 and EP 8 at the software input of the controller 1. Thereby increasing the reliability of the device. J5

formula of invention

A device for controlling the control loop, which contains a sensor connected to the variable control input 20, the output of which is connected to the control input of the actuator, the signal output of the controller through a signaling device connected to the first input of the computing unit, the first output of which is connected to the ineditor A. Revin

Compiled by O. Gudkov

Tehred M. Khodanich Proofreader O. Tigor

Order 2212/48 Circulation 864 Subscription

BNIIPN USSR State Committee

for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., d, 4/5

Production and printing company, Uzhgorod, st. Project, 4

a second, with a discrete electropneumatic transducer, a third with an analog electropneumatic transducer, and a second input with the output of a pneumo-electric transducer, the input connected to the software input of the regulator and the information output of the switching unit, the first information input of which is connected to the output of the regulator control output of the control input - with the first input of a discrete electropneumo-transformation of bodies, characterized in that, in order to increase the reliability of operation, a choke is introduced into it and successively in li ne pneumatic relay, pneumosizes and a power amplifier whose output is connected to second data input of the switching unit and via a throttle - to the first input of the pneumatic relay, the second input of which is connected to the output of the analog elektropnevmopreobrazovatel and control input - to the second output of the discrete elektropnevmopreobrazovatel.

Claims (1)

Claim A device for controlling a control loop, comprising a sensor connected to an input of a variable controller, the output of which is connected to a control input of an actuator, a signal output of a controller through a signal device is connected to the first input of a computing unit, the first output of which is connected to an indicator, the second to a discrete electro-pneumatic converter, and the third - with an analogue electro-pneumatic converter, and the second input - with the output of the pneumatic-electric converter ^, the input of the controller connected to the program input torus and the information output of the switching unit, the first information input of which is connected ₍ with the output of the regulator reference signal, and the control input is connected to the first input of the discrete electro-pneumatic converter, characterized in that, in order to increase the reliability of operation, a throttle and pneumatic relays are connected in series, pneumatic and a power amplifier, the output of which is connected to the second information input of the switching unit and, via the inductor, to the first input of the pneumatic relay, the second input of which is connected to the output of an log electropneumatic converter, and the control input with the second output 25 of a discrete electropneumatic converter.