SU1345213A1 - Self-monitoring control device - Google Patents

Abstract

The invention relates to the field of automation and computer technology and can be used to control a relay switch. The purpose of the invention is to increase the reliability of the device. The device contains a control unit 1, the first 2 and second 3 keys, the first 4 and second 5 matching elements, the first 6 and second 7 signal conditioners, the first delay element 10, multiplexer 11, the first 16 and second 17 elements I. the element OR 18, the driver 19 pulses, the second delay element 20, the encoder 21, the comparator 22, the trigger 23. The device provides control of the operation of the multiplexer 11 and the monitoring of the switch relay operation. 1 il. (L

Description

The invention relates to automation and computer technology and is intended for use in automatic control systems for various co-mutators made on self-locking electromagnetic relays.

The purpose of the invention is to increase the reliability of the device.

The drawing shows a block diagram of the device.

The device contains a control unit 1, the first 2 and second 3 keys, the first 4 and second 5 matching elements, the first 6 and second 7 signal conditioners, made, for example, in the form of a limiter with a trigger, power inputs 8 and a common bus 9 devices, the first element 10 delay, multiplexer 11, performed in -,. de pyramidal relay decoder, the relay coil 12 of the switch with self-blocking contacts 13, the self-blocking matching elements 14, the blocking voltage input 15, the first and second elements AND 16 and 17, the element OR 18 pulse former 19, the second delay element 20, encoder 21, comparator 22, trigger 23, inputs and outputs 24-29 of the control unit

The device works as follows.

From the outputs 28 of the control unit 1, the code corresponding to the address of the required switch point is fed to the inputs of the comparator 22 and to the control inputs of the multiplexer 11. At the same time, in the multiplexer 11, which is a pyramid relay decoder for K-outputs, the signal input is connected to one of its K-outputs and, accordingly, to the winding 12 of the required relay of the switch, i.e., the relay is prepared for switching on or resetting this relay.

Then, from the first 24 or second 25 outputs of the control unit 1, a set or reset signal is received, which goes to the first or second inputs of the delay element 10 and the OR 18 element, as well as to the first input of the first or second element AND 16 or 17. the output of the element OR 18 appears a signal, which includes the pulse shaper 19, a short pulse of which with a duration of 1-2 MCS enters the input

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resetting the flip-flop 23 without changing its initial state, and to the input of the delay element 20, at the output of which an input pulse appears, shift 0

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This pulse passes through multiplexer 11 through one of its K-outputs, forming 21 K-bit code at the inputs of the encoder. The encoder 21 converts the K-bit code to the source p-bit code of the address of the point that comes from its outputs to the inputs of the comparator 22, the control input of which contains the enabling signal from the output of the trigger 23. then, when the codes on both inputs of the comparator 22 coincide, an impulse appears at its output that is equal in duration to the output pulse of the delay element 20, which sets its trigger 23 with its falling edge. At the same time, the control input of the comparator 22 appears ayuschy signal and the second input of the first and second AND gates 16 and 17 - the enable signal. In the switch-on relay mode, the turn-on signal appears at the output of the first element AND 16, opens the key 2, providing the relay 12 through the element 4 of the switching voltage U,, and turns on the driver 6,

When the self-blocking contact 13 closes, the voltage on the winding of the relay 12 decreases to the level Uj. The voltage drop is detected by the driver 6, the signal from which is output. It is fed to the input 26 of the block 1 of the control of turning on the signals arriving from the outputs 24 and 28 of the block 1 of the control of continuation of work,

If the closure of contact 13 does not self-block due to a switch failure, or a voltage is applied to the winding of an already turned on and locked relay, which corresponds to a switch failure or a program error, then there is no voltage drop across the winding of relay 12, the driver 6 does not generate a continuation signal, and the delay element 10, after a certain time has elapsed, generates and sends to the input 29 of the control unit 1 a fault signal,

In switch reset mode, a reset signal appears at the output of an elec

And 17, opens the key 3, providing the relay 12 to the winding through the common potential element 5, and turns on the shaper 7. At the same time, the voltage on the winding of the relay 12 is set, the value of which, determined by the ratio of the values of matching elements 5 and 14, is much lower release voltage, which turns off the relay coil 12, opens the self-blocking contact 13 and relieves voltage from the relay coil 12. The voltage drop that occurs at the same time is detected by the driver 7, the signal from its output goes to input 27 bl ka 1 control continuing. If, due to a malfunction of the switch, the opening of the contact 13 does not self-block, or the reset signal hits the winding of the non-switched relay, there is no voltage difference, driver 7 does not generate a continuation signal, and delay element 10 delays and transmits to the input 29 of the unit 1 control signal failure. When the next switch switch relay 12 is turned on or reset, the pulse from the output of the pulse generator 19 by the leading edge returns the trigger 23 to its initial state, which at the same time prevents the activation or reset signals through elements 16 and 17 and enables the comparator 22. Operation of the conditioner begins multiplexer 11, etc.

If the control of multiplexer 11, which precedes the indicated operations of switching on or resetting the relay 12 of the switch, detects a malfunction that does not match the codes compared to the 22 analog signal, the output signal of the cam comparator 22 does not appear, the trigger 23 does not turn on, the first and the second elements AND 16 and 17 remain prohibited, the enable or reset signals are not generated, no continuation signal is received in the control unit 1. After a certain time has elapsed, the delay element 10 generates and transmits a fault signal to the input 29 of the control unit 1. In this state, trigger 23 determines the nature of this fault.

Relay distributor monitoring is performed during the interval.

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1-2 of the ISS, the indicated minimum duration of which is determined by the condition of the undistorted pulse passing through the ramified relay distributor and has practically no effect on the performance of the switch relay 12, the turn-on or reset times of which are measured in ms.

The introduction of the control signal supply (reset) only on the winding of the required relay switch, carried out before the signal on the relay coil and control of the driver of the signal, implemented by comparing the original n-bit address code and n-bit code converted by the encoder from the K-bit code taken from the outputs of the multiplexer, increases the reliability and reliability of the relay switch. without worsening its speed, since it excludes switching on (reset) of the non-programmed relays of the switch and the associated consequences in the control of products, ensures timely detection of faults in the multiplexer.

Claims (1)

Invention Formula Control device with control containing control unit, first delay element, first and second matching elements, first and second keys, first and second signal conditioners and multiplexer, first and second outputs of control unit connected to corresponding inputs of the first delay element, whose code is connected to the first input of the control unit, the output group of which is connected to the address inputs of the multiplexer, the information input-output group of which is a group of signal input-output devices Properties, outputs of the first and second keys and information inputs of the first and second signal conditioners are connected to the multiplexer signal input-output, information inputs of the first and second keys are connected to the power and common bus inputs of the device, respectively, through the first and second matching elements, outputs of the first and second drivers signals are connected respectively to the second and third inputs of the block 513452135 control, distinguishing the installation input of the trigger, first with the fact that, in order to repeat the output of the control unit is connected to the reliability of the device, enter the first input of the OR element into it and from the second the encoder, comparator, trigger, the second input the first element And, and the second delay element, the shaper output — with the second inputs of the element pulse, the first and second elements OR, and the second element AND, the output AND, and the element OR whose output is connected to the control elements in series - I will give the second key and w the second pulse driver and the second element of the signal collector; for resetting the trigger, the direct and inverting control is connected to the first group of outputs, which are connected to the information inputs of the comparator with the combined first, the inputs of the encoder are connected to the groups of the first and the second element of the signal inputs-outputs of the multi-channels I and with the control input of the computer-plexer, and the outputs with the second group of the rator, the output of which is connected to the inputs of the comparator.