RU1772783C - Device for diagnostics of discrete circuits in automatics - Google Patents

Abstract

SUMMARY OF THE INVENTION: Generating a failure address in a matrix memory by comparing two series of pulses, one of which is formed by a multiplexer and a ring register, and the other by a decoder. The device comprises a pulse distributor, a switch, a source, three transducer sensors, differentiating elements, rectifiers, rectangular pulse shapers, a multiplexer, AND elements, a decoder, a ring register, a memory memory unit, and an indication unit. 1 ill., 2 tablets

Description

The invention relates to techniques for testing and monitoring technical systems and can be used to diagnose discrete automated electrical circuits.

Currently, to enhance the reliability of an automation device, their circuit designs are widely used.

Control devices for discrete automation circuits are known which are based on establishing a correspondence between the reaction of the circuit to a stimulating (test) signal with the expected result 1. If they do not coincide, a circuit malfunction is detected. Such devices are complex and cumbersome, since they require special verification programs, sources of stimulating signals, means of switching, comparison and recording of the obtained results, as well as devices for interfacing with the control object.

When monitoring the health of redundant automation circuits, the principle of comparing the signals at the outputs of identical channels during its operation can be used. In this case, the control device is greatly simplified.

A device for diagnosing multi-channel redundant systems 2 is known, comprising, by the number of channels of n K-bit buses and by the number of bits K of n-bit match blocks, (n - bit counter, analysis unit, OR element, counter, switching unit inverter.

The device allows to determine the faulty channel of the system by analyzing possible combinations of the results of comparing the voltages at the outputs of the channels of the system with a certain acceptable value. However, the known device does not allow to detect the type of failure in the faulty channel, as well as to record the diagnostic results when the system is in different modes

Closest to the invention is a device for indicating failures in redundant systems 3, containing

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with

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three switches, a multiplexer, a generator, a time relay, a signal switch, a decoder, a ring register, AND elements, a memory unit and a digital indicator.

The known device makes it possible to identify both the number of the faulty channel and the number of the failed output and the type of failure, and the results of the diagnosis of the system, as the outputs of the backup channels are polled, are stored in the memory unit and can be displayed on the digital indicator at the end of the diagnosis. Thus, the known device has a greater depth and shorter diagnostic time, since the diagnostic process is not interrupted when faults 2 are detected.

A disadvantage of the known device is the lack of reliability due to the presence of a large number of connections with the diagnostic object, as well as the need for special structural modification of the object for diagnostic purposes.

It is an object of the invention to simplify a diagnostic device.

To achieve this goal, a device for diagnosing three-dimensional discrete electroautomatic circuits, comprising a multiplexer, a switch, a decoder, an output group of which is connected to a group of information gatherings of rows of a matrix storage unit, a group of outputs of which is connected to a group of information inputs of an indication unit, a power supply, a ring a register, and three elements A, a control pulse distributor, three differentiating elements, three rectifiers, three formators / are introduced. rectangular pulses and three current transducer sensors located in the power supply circuits of three discrete electrical automation circuits, information outputs of three current transducer sensors through a differentiating element connected in series, a rectifier and a rectangular pulse shaper are connected to the first inputs of the first, second, and third elements And, as well as to the first, second and third information inputs of a multi, whether, ator, the first input of the first element And is connected to the second input of the third element And The first input of the second - with the second input of the first, and the first input of the third - with the second input of the second element And, the outputs of the first, second and third elements And are connected to the corresponding inputs of the first group of inputs of the decoder and the same address inputs of the multiplexer.

the output of which is connected to the clock input of the ring register, the outputs of which are bitwise connected to the group of information inputs of the columns of the matrix storage unit, the clock outputs of the control pulse distributor are connected to the corresponding control inputs of the switch, the information input of which is connected to the output

0 power supply, and the outputs are the outputs of the device for connecting to the status inputs of three discrete circuits of electrical automation and are connected to the corresponding inputs of the second group of inputs

5 of the decoder, the output of the start of the control cycle of the control pulse distribution unit is connected to the zeroing inputs of the ring register, matrix storage unit and indication unit.

0 The essence of the device is

next.

The operation of the discrete circuit of electroautomatics is accompanied by the sequential switching on or off of its discrete 5 elements in accordance with the logic of their connection. In this case, an abrupt change in the current consumed by the circuit from the power source occurs. Changing the current in the power circuit of an electrical circuit

0 at each step of its operation can be fixed using the current sensor-converter circuit. To the signal conversion paths taken from that sensor, one can obtain a sequence of pulses corresponding to the operation of the circuit in clock cycles. By comparing this sequence with the reference one, it is possible to establish on which of the clocks the circuit of the electroautomatics failed.

О When controlling a triple circuit of electroautomatics, a majority principle can be used to form a reference pulse sequence, according to which the pulse

5 is taken as a reference if it is simultaneously on a fork B of two measuring and conversion channels, since the probability of the same malfunction in two channels simultaneously

0 is negligible. The reference pulse sequence generated in this way is used to compare with the pulse sequences corresponding to all three reserved

5 electrical automation schemes

In FIG. 1 is a structural diagram of a device for diagnosing terned discrete circuits of an electric automatic device, comprising distributions of gel 1 - control pulses; ommug go, - 2,

power source - 3; transducer sensor - 4; discrete automation circuit - 5; differentiating element - 6; rectifier - 7; shaper - 8 rectangular pulses; multiplexer - 9; element And - 10; decoder - 11; ring register - 12; matrix storage unit - 13; display unit - 14.

The control pulse distributor 1 is intended for zeroing the annular register 12, the matrix storage unit 13 and the indicating unit 14, as well as for generating commands to close the switch 2 circuits, including the reserved discrete automation circuits 5 in the corresponding operating mode.

Power supply 3 supplies voltage to the discrete automation circuitry 5 and switch 2.

The current transducer 4 converts the current flowing through it to voltage. It is a shunt of low resistance, the voltage drop at which is amplified by a voltage amplifier.

The differentiating element 6 generates single pulses at the time of an abrupt change in voltage at the output of the current transducer 4.

Rectifier 7 converts the sequence of pulsed polarity pulses into a single pulse, which is converted into a sequence of rectangular pulses by means of a rectangular pulse shaper 8, for which a single-oscillator circuit can be used.

The multiplexer 9 connects its output only to that information input, which corresponds to a circuit 5 of the electroautomatics that is known to be operational on this clock cycle. It can be performed, for example, on the integrated circuit K155KP5 (4).

Element 10 AND generates a pulse at the output while simultaneously supplying pulses to its output from the corresponding pair of rectangular pulse formers 8.

The decoder 11 generates a signal at a specific output depending on the code generated by a combination of signals at the inputs connected to the outputs of the elements And, and at the inputs connected to the outputs of the switch 2 It can be performed by combining, for example, K155IDZ integrated circuits (4)

The ring register 12 sequentially generates pulses at its outputs as clock pulses arrive at its input from the output of multiplexer 9. It can be performed, for example, by combining integrated circuits K155ID1 (4).

The matrix storage unit 13 is designed to record information about the operation mode of the device, the number of the reserved circuit of the electroautomatics 5, the cycle of its operation and the state of this cycle. It can be performed, for example, on integrated circuits of the type K155RU5 (4).

0 The display unit 14 is designed to display the diagnostic results when reading information from the matrix storage unit 13. It can be performed on LEDs, lighting

5 which occurs when the corresponding discrete elements, such as triggers, are triggered.

In Fig. 1, the clock outputs of the control pulse distributor 1 are connected

0 with the corresponding control inputs of switch 2, the information input of which is connected to the output of power source 3, and the outputs are the outputs of the device for connecting to the outputs

5 states of three discrete circuits of electroautomatics 5 and are connected to the corresponding inputs of the second group of inputs of the decoder 11, the output of the non-cycle loop of the controller and the control distribution block

0 pulses 1 are connected to the zeroing inputs of the ring register 12, the matrix storage unit 13, and the indication unit 14.

Current transducers 4 are placed in the power supply circuits of three discrete circuits of electroautomatics 5. The information outputs of these sensors are connected through the corresponding differentiating element 6, rectifier 7 and rectangular pulse shaper 8 to the first inputs of the first, second, and third elements, respectively 10 And, as well as to the first, second and third information inputs of mul5 typlexer 9. The first input of the first element 10 And is connected to the second input of the third element 1L, the first input of the second - from to the first input of the first, and the first input of the third - with the second input of the second element 10 I. The outputs of the first, second, and third elements And are connected to the corresponding inputs of the first group and the decoder 11 and the same address inputs of the multiplexer S. The output of the multiplexer 9 is connected to the clock the inputs of the annular register 12, the outputs of which are bitwise connected to the group of information inputs of the columns of the matrix storage unit 13, the group of information inputs of the rows of which are connected to the group of outputs of the decoder 11, and the group whose outputs are with a group of information inputs of the display unit.

The device operates as follows.

At the beginning of the cycle, the control by the signal from the output of the control pulse distribution unit 1 resets the ring register 12, the matrix storage unit 13, and the display unit 14.

When the control pulse distributor 1 is brought into one state or another, a control pulse appears on one of its control outputs, under the action of which the switch 2 closes a certain triggering circuit of the three electric automation circuits 5 to the corresponding operating mode, and also supplies the voltage to the corresponding input of the second group of inputs of the decoder 11 A discrete change in the state of circuits 5 in this mode will abruptly change the current consumption from power source 3. Currents flowing through current transducers A. are formed in the voltages that are applied to the corresponding differentiating elements, the output of which is formed by a sequence of unipolar pulses, which is rectified by a rectifier 7 and converted into a sequence of rectangular pulses by means of a corresponding pulse former 8, Thus, Each clock cycle of circuit 5 will produce a square pulse at the output of square wave driver 8. If the circuit fails at any clock cycle, the indicated pulse will be absent.

The multiplexer 9, together with the rectangular pulse shapers and the 10 I elements, allows at its output to form a complete sequence of pulses, i.e. a sequence that reflects the work on the whole clock of a functioning electro-automation circuit. The joint operation of the three formers of rectangular pulses C, the corresponding elements 10 And and the multiplexer 9 is as follows.

The pulses from the first, BTOPOSO and the third pulse shaper 8 are fed to the same information inputs of the multiplexer 9 and the pulses from the corresponding pair of shapers 8: 1st and 2nd, 2nd and 3rd, 3 are fed to the inputs of the elements 10 l / i 1st / 1st, respectively. Thus, pulses will appear at the outputs of elements 10 AND only when pulses arrive simultaneously from the corresponding pair of formers 8. The multiplexer 9 connects to its input only the information input to which a pulse corresponding to the electroautomatics circuit 5 that is operational at this operating time is supplied. So, for example, a pulse at the output of the first driver 8 can be received corresponding to the clock cycle of a working electroautomatic circuit 5, if at the same time pulses appear at the output of the 1st and 2nd, 1st and 3rd or 1st, Of the 2nd and 3rd formers, respectively, i.e., when the following combinations of logical zeros and ones (1, 0, 0), {0, 0, 1) or (1, 1, 1),

The operation of the multiplexer can be explained using table. 1.

Pulses sequentially supplied from the multiplexer 9 to the input of the ring

register 12, cause the alternate supply of pulses from its outputs to the corresponding information inputs of the columns of the matrix storage unit 13. The first group of inputs of the decoder 11 is fed a combination of logical zeros and ones from the outputs of the three elements And 10, and one of the inputs of the second group of inputs is a logical unit from the corresponding output of switch 2; moreover,

logical unit at this input corresponds to a certain mode, in which diagnostics of circuits 5 of electroautomatics are carried out, The absence of voltage at the other inputs of the second group

the inputs of the decoder 11 corresponds to a logical zero m.

The pulses supplied from the output of the multiplexer 9 to the input of the ring register 12 cause alternate pulses to appear at not the b0 inputs of the latter, which are associated with the corresponding information inputs of the columns of the matrix storage unit 13. Simultaneously with the appearance of a clock pulse on one

from the columns of block 13, a pulse is supplied from the specific output of the decoder 11 to the corresponding information input of the row of this block. A combination of logical noupeas and a unit supplied from the outputs

ipax of elements 10 And to the first group of decoder inputs, determines the state of the 5 automatic circuitry circuits in accordance with table. 2.

The voltage applied to one of the codes of the second group of inputs of the decoder 1 of the corresponding control output of the switch 2 determines the operation mode 5 of the electroautomation during the backup process

Thus, at each cycle of operation of the electroautomatics circuits 5, information on the operation mode of the circuit, the numbers of the cycle operation of the circuit in this mode, and the state of the circuit at this cycle of its operation will be recorded in a matrix storage element.

The information is read from the display unit 14, the number of indicators of which is equal to the number of memory elements of the matrix storage unit 13. The illumination of the indicators corresponds to one or another malfunction.

Diagnostic device. Allows you to diagnose triple discrete circuits of electrical automation at each of their inclusion in the work.

In this case, it is determined not only the reserved circuit that failed in this mode, but also the cycle at which its failure occurred.

The economic effect of the use of the device is to reduce the cost of its manufacture and operation due to the significant simplification of the device.

The indirect economic effect is determined by an increase in the reliability of the device due to a decrease in its connections with the objects to be diagnosed, timely prevention of failures of the electric circuit, and a reduction in the time for troubleshooting due to an increase in the depth of diagnosis.

Claims (1)

The claims A device for diagnosing triple discrete electroautomatic circuits, comprising a multiplexer, a switch, a decoder, the output group of which is connected to the flu of the information inputs of the rows of the matrix storage unit, the output group of which is connected to the group of information inputs of the display unit, a power source, a ring register, and three AND elements , about t l and which, in order to simplify, a control pulse distributor, three differentiating elements, three rectifiers, three rectangular pulse shapers and three current transducer transducers placed in the power supply circuits of three discrete electric automation circuits are introduced into it, information outputs of three transducers of current through the corresponding, connected in series, a differentiating element, a rectifier and a driver of rectangular pulses are connected to the first inputs of the first, second, respectively the third element And, as well as to the first, second and third information inputs of the multiplexer, the first input of the first element And is connected to the second; -1 input of the third element And, the first input of the second is with the second input of the first, and the first input of the third is with the second input of the second element And, the outputs of the first, second and third elements And are connected to the corresponding inputs of the first group of inputs of the decoder and the same address inputs of the multiplexer, the output of which is connected to the clock input of the ring register, the outputs of which are bit connected to the group of information INPUT columns of the matrix memory block, the clock outputs of the control pulse distributor are connected to the corresponding control inputs of the switch, the information input of which is connected to the output of the power source, and the outputs are the outputs of the device for connecting to the state inputs of three discrete electrical circuits and connected to the corresponding inputs of the second group of decoder inputs, the output of the start of the control pulse distribution control loop is connected to yuschimi koltsesop zero-input register, a matrix storage unit and display unit. 1 1 O O Table 1 table 2