SU1363135A1 - Centralized checking and control pneumoelectronic system - Google Patents

Abstract

The invention relates to technical means of automation and can be used in the process control system of oil refining and chemical industries. The purpose of the invention, the improvement of speed and accuracy, is achieved by the introduction of new units and functional connections. The system contains controllers 21, a control computer 19, a group control device 31, valves 22, first and second control buttons 29 and 30, first pneumatic switching relays 14, address shaping elements 2, nominal preset 4, remote preset 6 control Yo (L with O) with with JV

Description

laziness, three-position switches 5, first, second, third and fourth switches 23-26, analog pneumatic electric converters 15, input and output channels of discrete information 18 and 20, two-position switches 3, three groups of elements I 9-11, pneumatic electric switches with contacts 12 to The control circuits of the motor setting devices 13. In each control loop, the outputs of the on-off 3 and three-position switches 5 are connected through the first element 9 to the input channel of the discrete information 18 of the control computer and managers

one

The invention relates to technical controls and can be used in the process control system of oil refineries, chemical technology, food industry,

The purpose of the invention is to increase speed and accuracy.

The drawing shows the principles. The general scheme of the centralized control and management system with one control loop.

The system contains a control panel 1 equipped for each control loop with an address forming element 2, a two-position switch 3, a setting device 4 for nominal values, a three-position switch 5, a remote control setting device 6 centralized (common to all kpHTypoB control) with More than 7 and Less than 8 buttons, and also For each circuit, the first, second and third elements are And 9, 10 and 11, pneumatic-electric switch 12, installed in the control circuit of the motor setting device 13 (consisting of a reversing electric motor, al which is kinematically coupled to drive one pnevmatichesko- setpoint), the first pneumatic switching relays 14 and analog pnevmoelektropreobrazovateli 15

The measuring channel consists of a multiplexer 16 and analog-digital

inputs of pneumatic switches 12, the switching inputs of which are connected to the outputs of the second and third elements 10 and 11 and the output channel 20 of discrete information from the control computer, the outputs of the dip switch 3 are connected to the control inputs of the first pneumatic switches. the key relays 14, and the control inputs of the second and third elements, And 10 and 11 are connected with the centralized control buttons 7 and 8 and the output of the element 2 forming the address. 1 silt

converter 17, channel 18 for inputting discrete information into a control computer (UHF) 19, channel | 20 for outputting discrete information included in the control loop of the controller 21 and valve 22, the common first switch 23, the second the switch 24, the Third switch 25, the fourth switch 26,

0 containing the second and third pneumatic switching relays 27 and 28, the first control button 29, the second control button 30, and the instrument 31 of the group. control, collector 32 nom.

5, a parameter collector 33, a remote control signal collector 34, a signal collector 35 for actuators, a channel 36 for an actuator, and

0 channel 37 parameter from the sensor.

The system of centralized control and management works as follows

5 In the mode of remote (manual) control of a particular control loop, a three-position switch, 5 is set to position P, and its output

0, the signal turns off the regulator 21 and opens the valve 22. As a result, the output signal of the remote control setting device 6 is switched to channel 36 to the actuator.

31

using the element 2 of the formation of the address to control the value of the output signal of the remote control setting device 6 using the group control device 31. At the same time, the output signal of the address formation element 2 is fed to the control input of the first switch 23. As a result, the remote control signal of this circuit is switched to the collector for the remote control signals and then to the measuring input of the group control device 31.

In the automatic control mode of the electric control loop, the three-position switch 5 is set to the A position. When this mode is set, the signal of the setpoint to the controller 21 can be performed using the control setpoint unit 4 of the nominal value (basic variant) or using the setpoint adjuster 13 and More buttons 7 and Less than 8. The choice of one or another variant is carried out from the remote control 1 by means of the two-position switch 3, In the P position (remote control) of the two-position switch 3 (the signal at the output of the PZ is equal to O) Attaining the first pneumatic switching relay 14 and the output signal of the nominal A setpoint switch commutes to the first input of the regulator 21, In the position MZ (motor setting) of the two-position switch 3, its output takes a single value and the first pneumatic switching relay 1A provides switching to the first input of the regulator 21 output signal of the motor sensor 13. The address generation element 2 makes it possible to control the value of the nominal value of the group control device 31. For this, the corresponding input of the first switch 23 is connected with the first input of the corresponding regulator 21, thereby automatically providing the opportunity for the group control device 31 to control the output signal of the true nominal setter, which is currently connected to the regulator 21, the need to control and change the output signal of the backup setting device (not currently connected to the controller 21) can be achieved by pressing the corresponding control button 29 or 30

five

five

31

five

5 5 0 55

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switching to the measuring input of the group device 31 for controlling the required signal (output of the second 24 or third 25 switches) using the second 27 or third 28 pneumatic switching relay of the fourth switch 26.

The motor setting device 15 is controlled from the console 1 by centralized buttons greater than 7 and less than 8, the output signals of which are collected according to the scheme AND element 2 of forming the address of a particular circuit using the first 9 and second 10 elements AND (i.e. control from the console is possible only when calling the contour).

In the preparation mode for transferring to the supervisory control (and vice versa), the operator quickly and accurately (due to the measurement of two different signals using a single measuring set) synchronizes the operation of the motor and console settings.

When switching to the supervisory control mode of a particular circuit, the three-position switch 5 is set to position M (machine). At the same time, its output signal is assembled according to the AND scheme with the output signal of the two-position switch 3, set to the MZ position (motor setting device) using the first element AND 9. The output signal of the latter switches the pneumatic-electric switch 12 to the position providing the disconnection from the control inputs of the motor dial 13 control buttons More than 7 and Less than 8 and connecting a channel to them. 20 outputting discrete information from the ACU 19. Information on the switching of the circuit to the supervisory mode is entered into the ACU 19 from the output of the first element 9 through the channel 18 for inputting discrete information. This signal activates the supervisory mode of the circuit.

Pneumatic signals, proportional to the regulated value and its setpoint, are input to UVM 19 using analog pneumo-electric converters 15 and a UVM measuring channel consisting of multiplexer 16 (software controlled com: utatora) and analog-digital converter 17, Results measurements are processed

in accordance with a predetermined program for forming a control action, changing the assignment to the corresponding controller 2.

Compared with the prototype, the preparation time is shortened from 30-60 seconds to 5-10 seconds, and the pressure jump in the nominal channel during mode switches decreases from 1.5-2.0% to 0.5%. This provides increased speed and improved accuracy of the system as a whole. /

Claims (1)

Invention Formula Pneumatic-electronic centralized monitoring and control system, containing controllers, motor sensors, control computer, group control device, valves, first and second control buttons, first-pneumatic switching relays, address shaping elements, setting factors, remote control settings controllers, three-position switches, first, second, third and fourth switches, analog pneumatic electric converters, input and output devices for discrete information, and each The remote control sensor's output control loop is connected through the valve to the actuator, the output of the nominal setting unit and the motor setting device is connected to the inputs of the first pneumatic switching relay, the output of which is connected to the first regulator input of the given circuit and one from the first inputs of the first switch, the output of each setpoint generator is connected to one of the inputs of the third, and the output of each motor setting unit to one of the first inputs of the second switchboard, the control inputs of the first, second O and the third switch are connected to the outputs of the address generation elements, the outputs of the first switch are connected via parameter collectors, remote control signals and signals to the actuators to the inputs of the group monitoring device, the output of the first VNIIPI Order 6361/37 Circulation 863 Subscription Proizv.-polyr, pr-tie, Uzhgorod, st. Project, 4 five 5 l five 0 five through the collector of the nominal value and the outputs of the second and third switches are connected to the inputs of the fourth switch, the control inputs of which are connected to the outputs of the first and second control buttons, and the output to one of the inputs of the group control device; the parameter channel is connected to the second input - Diero controller and one of the second inputs of the first switch, the output of each controller is connected to the channel to the actuator and one of the third inputs of the first switch, the output of each remote control setpoint One of the fourth inputs of the first switch is connected to, the output of the first switching relay and to the analog parameter are connected via analog pneumo-electric converters to the measuring channel of the control computer, and input and output channels of discrete information, speed and accuracy, it has centralized control buttons for motor setting devices and a two-position switch, the first, second and third elements, and pneumatic An electrical switch with contacts in the control circuit of the motor setting devices, the outputs of the two-position and three-position switches are connected to the inputs of the first element I, the output of which is connected to the input channel of the discrete information to the control computer and the control input of the pneumatic-electric switch that switches the inputs associated with the outputs of the second and third element And the channel output of discrete information from the computational control unit f outputs of each two-position transducer The switch is connected to the control input of the first pneumatic switching relay, and the inputs of the second and third elements AND are connected to the centralized control buttons and the output of the corresponding address generation element.