SU1486986A1 - Control device - Google Patents

Description

The invention relates to the management of technological processes, in particular to the interface systems of the control computer complex with pneumatic regulators, and can be used in various industries. The purpose of the invention is to improve the reliability and quality of regulation. Device reguliro2

It contains a technological parameter sensor 1 and an actuator 3 connected to a regulator 2, made with a control unit, the output of which is communicated with the normally open input of the first switch 6. Computing unit 4 is connected to the alarm unit 5. Analog input of unit 4 is connected to the pneumoelectric output analog converter 12, analog output - with the input of the analog electropneumatic converter 11, and the first discrete output 15 - with the control input of the first switch 6, output to is connected with the normally open input of the third switch 8 and through the inertial link 9 to the software input of the controller control unit 2. The output of the third switch 8 is connected to the input of the analog pneumoelectric converter 12, the second 16 and third 17 discrete outputs of the computing unit 4 are connected respectively to the control inputs of the second 7 and third 8 switches. 1 il.

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1486986

The invention relates to a process control engineering, in particular to systems of conjugation of a control computer complex (UHC) with pneumatic regulators, and can be used in petrochemical, chemical and other industries.

The purpose of the invention is to improve the reliability and quality of regulation.

The drawing shows a diagram of the device.

The control circuit includes a sensor 1 process parameter, the controller 2 with the control unit (in the drawing, the control unit is conventionally connected to the controller) and the actuator 3 of the control valve. To implement the supervisory control mode, in which the signal of a given parameter value is generated using a computer, the device is equipped with a computing unit 4 connected to the alarm unit 5, the first 6, the second 7 and the third 8 switches, inertial link 9, made in the form of series-connected adjustable choke and capacitance, and a memory unit 10, made in the form of a capacitance connected in series and a repeater-power amplifier.

The analog output of block 4 through an analog electro-pneumatic converter 11 is connected to the input of a switch 7, the normally open output of which is connected to a normally closed input of a switch 8 connected by its output through an analog pneumatic converter 12 to an analog input of a block 4. Normally closed output of switch 7 through a memory block 10 connected to the normally closed input of the switch 6, the normally open input of which is connected to the master output (channel) 13 of the control unit of the regulator 2, and the output n The switch 6 is connected to the normally open input of the switch 8 and through the inertial link 9 to the program input 14 of the control unit of the regulator 2.

The first 15, second 16 and third 17 discrete outputs of block 4 are connected respectively to the control inputs of switches 6, 7 and 8.

The device works as follows.

Regulator 2 can operate in three modes: remote, automatic and supervisory control, which are set in the control unit of the regulator.

In the remote control mode, the control signal to the actuator 3 is supplied from the set point of the controller control unit ·.

In the automatic control mode, the set value of the parameter is formed by the setting device of the controller control unit, which generates the control signal to the executive mechanism depending on the signal from the sensor 1.

In the supervisory control mode, the setpoint value of the parameter is determined in the computing unit 4. The control unit of the controller 2 is set to the “Program control” position.

In the initial position, the reference signal from the setpoint controller of the controller through the channel 13, the switch 6 and the inertial element 9 is fed to the controller 2 and simultaneously through the switch 8 and the converter 12 to the analog input of the unit 4, while the corresponding signal board lights up at block 5. When block 4 is ready to execute the program for calculating and issuing a reference signal to controller 2, block 5 issues a “Ready” signal.

When personnel confirm readiness for transition to the supervisory control mode from block 5, a “Work” signal is issued to the input of block 4, which is indicated by the inclusion of the “Work” board on block 5. Block 4 reads the output signal of the converter 12 using this signal, generates an equal signal and issues the signal to the switch 8. In this position, the output of block 4 through the converter 11, switches 7 and 8 and the converter 12 is fed to the analog input of block 4. In block 4, a comparison of its output signal with the signal from the setpoint adjuster 2

If the difference of these signals does not exceed a predetermined value, then the signaling unit 5 is given a “UVK” signal, and the “Ready” signal is removed. At the same time, control signals are issued from the first 15 and second 16 discrete outputs of block 4 to switches 6 and 7, allowing the signal from block 4 to pass through the converter 11, switch 7, block 10 of memory, switch 6 and inertial link 9 to the software input of controller 2. Equality signals from the setpoint controller built into the regulator and block 4 at the initial moment provides the bestless transition to the control mode of the regulator 2 from block 4.

During subsequent cycles of issuing a reference signal from block 4, each time the value of this signal is compared with the magnitude of the reference signal in the previous cycle. If the difference of these signals exceeds a predetermined value, a signal is not output to the controller 2 and the signals UVK and Work are removed from the alarm unit 5, the control loop is switched to automatic operation. The permissible magnitude of the error of the signals at the previous and subsequent cycles is determined by the characteristics of the control object, the frequency of the signal output, the tuning parameters of the inertial link 9 and the controller.

1486986

The presence of the inertial link allows smoothing the transition from one value of the setting signal to another, 'ensuring its smoothness. The smoothness of the transition reduces the requirement for the frequency of issuing a control signal, and increases the magnitude of the permissible signal error. The presence of the inertial link also provides a smoother transition from the control mode from block 4 to automatic with sudden stops of block 4, for example, during a power outage.

Claims (1)

Claim 15 A control device containing a process variable sensor and an actuator connected to a controller made with a control unit, the output of which is communicated with the normally open input of the first switch, and a computing unit connected to the alarm unit, the analog input of which is connected to the pneumoelectric analog output the converter, the analog output - with the input of the analogous 25 gOV electropneumatic converter, and the first discrete output - with the control input of the first switch, characterized in that, in order to improve the reliability and quality of regulation, it is equipped with second and third switches, an inertial link, made in the form of a series-connected adjustable choke and capacitance, and a memory unit, made in the form of a series-connected capacitor and repeater-power amplifier The input of the second switch is connected to the output of the analog electro-pneumatic converter, the normally open output is with the normally closed input of the third switch, but through the memory block, the marginally closed output is connected to the normally closed input of the first switch, the output of which is connected to the normally open input of the third switch and through the inertial link to the software input of the regulator control unit, the output of the third switch is connected to the input of the analog pneumoelectric converter, and the second and third discrete the outputs of the computing unit are connected respectively to the control inputs of the second and third switches.