SU1439623A1 - Device for inspecting electric wiring - Google Patents

Abstract

The invention relates to automation and computing and can be used to control the installation of, for example, electrical units, wiring harnesses and printed circuit boards. The aim of the invention is to reduce the hardware cost of the device. The goal is achieved in that a device containing a clock generator, two decoders, two counters, two OR elements, a trigger, and the first. multiplexer, comparison unit and AND element, the third decoder, AND block of elements, second multiplexer, encoder, third OR element, two EXCLUSIVE OR elements and AND – NOT element, 1 Il are entered.

Description

four

WITH

a to

with

The invention relates to automation and computing and can be used to control the installation of, for example, electrical units, bundles, printed circuit boards.

The aim of the invention is to reduce the hardware cost of the device.

The drawing shows a block diagram of the proposed device.

The device contains a clock pulse generator 1, a second counter 2, the first element OR 3, the second element OR 4, the first element EXCLUSIVE OR 5, the third decoder 6, the second decoder 7, the trigger 8, the third element OR 9, the element OR NOT 10, the first count 11, block 12 elements AND, first multiplexer 13, block 14 comparison, second element EXCLUSIVE OR 15, first decoder 16, control object 17, encoder 18, second typlex 19, element 20, enable input 21, outputs 22 and 23 of the signals Circuit short circuit and open circuit, installation input 24, test output 25, output 26 code of the input contact, output 27 of the signal Cross connection, output 28 of the code of the output contact, input 29 specifies the contact code and mode input 30, the group of indicator outputs 31 device- | Ba.

 The device works as follows.

In the initial state, the resolution signal at input 21 is absent, the generator 1, counter 2 and trigger 8 are set to the zero state.

Before the start of control, the input 24 of counter 11 receives a parallel code of a number equal to the number of contacts involved in the object 17 of the control.

With the arrival of the resolution pulse at the input 21, the generator 1 begins to generate clock pulses. The logic zero level from the output of the trigger 8 to the input of the decoder 6, allows the passage of clock pulses to the output of the decoder 6 and then to the subtracting input of counter 11. Parallel binary code coming from the output of counter 11 to the input of the decoder 16, allows clock pulses from gating- the input of the decoder 16 on each of his output alternately. As a result, each clock pulse acts

about

Q

with

five

0

five

alternately at the inputs of the object 17 control.

In the simplest case, object 17. The control is, for example, an electrical bundle of a series of conductors. Four situations are possible here: the first is a harness; the second is the breakage of one or several conductors; a third - the conductors are interchanged; fourth - the closure of conductors between.sob.

If the harness is intact at each of the output contacts, it alternately develops clock pulses, forming a position code changing with each pulse, which is fed to the input of multiplexer 13. The presence of a logical zero from the output of trigger 8 at the control input of multiplexer 13 permits the passage of the position code to its output and further to the input of the encoder 18, where the transformation of the positional code into a parallel binary. A parallel binary code from the output of the encoder 18 is fed to the input of the element OR 9 and the input of the comparator unit 14, to the gate input of which clock pulses are received, fixing the moments of comparison of the codes.

Multiplexer 19. in the absence of a control signal at input 30 of the device connects the code from the output of counter 11 to the input of comparator 14, In the case of coincidence of codes, when a clock pulse arrives at its input at the output of comparator 14, a pulse arrives at the input the element AND 20. As a result, at the exit 31 a pulse appears, indicating that the object 1 7 of the control is intact.

 Thus, as clock pulses arrive at the input of the counter 11, the decoder 16 sequentially interrogates all the input contacts of the control object 17, for example, an electrical harness. Due to the fact that before the start of the control, the counter 11 is set to the state corresponding to the number of monitored contacts in the control object 17, and the clock pulses arrive at the subtractive input of the counter 11, then at the moment of the zeroing of the counter 11 state a transfer pulse arrives 25 and the fixing time of the end of the control process.

In the event of a single shsh of several links in the control object 17, at the moment of interrogation of a dangling circuit, a zero position code is generated at the output of the control object 17, which passes through the multiplexer 13, enters the inputs of the SHSh 4 element, and through the encoder 18 - to the inputs of the OR element 8. Logical zero levels from the outputs of RSHI cells 4 and 9 are fed to the inputs of the OR-NOT element 10. As a result, a pulse appears at the output 23, and the code at the output 26 indicates the number of the broken circuit and enters,. for example, an external printing device (not shown).

In the case of interchanging, for example, two circuits in the control object 17, the codes at the output of the counter 11 and at the output of the encoder 18 are different from each other, which leads to the presence of a logic zero level at the output of the comparison block 14, which enters the input of the second element EXCLUSIVE OR 15. At this moment, another input of the logical unit comes from the output of the encoder 18 through the element OR 9. As a result, a pulse appears at output 27, the code at the output 26 of the device indicates the number of the input contact of the object 17 con control, and the code at output 28 is It calls the number of the output contact of the object 17 control. Both output codes are sent, for example, to an external printing device.,

In the case of the closure of a series of circuits in the control object 17, a positional code appears at its output, several bits of which, corresponding to closed circuits, are set to the state of a logical unit. At the output of the first element EXCLUSIVE OR 5, the level of the logical unit appears, coming from the output of the element OR 4, the input of which receives a non-zero code. At the other, the input element EXCLUSIVE OR 5, the level of a logical zero appears from the output of the comparator block 14, since the codes of the numbers at its inputs differ from each other. As a result, a pulse is formed at the output 22, which also enters the input of the trigger 8 and sets it to the state of a logical unit. The decoder 6 prohibits the passage of clock pulses on the counter 11 and raises the receipt of their

0

five

0

five

Q

to the counter input of the counter 2. Under the action of a parallel binary code from the output of the counter 2, the decoder 7 generates at the input of the block 12 elements AND a positioning code that changes with each clock pulse. In this case, at another input of block 12, the code containing the level of a logical unit in several bits continues to be found. As the positional code changes at the moments of coincidence of the logical unit levels, pulses are formed at both inputs of block 12 and output through multiplexer 13, SHSh 4 and EXCLUSIVE OR 5 at output 22. At the moments when these pulses are output 26, the number code is the input circuit of the object 17 is the control, and the output 28 is the codes of the numbers of the output (closed) circuits of the object 17 control, l. Both codes arrive, for example, on an external printing device.

The considered order of operation of the device is realized under control. simple electronic circuits such as harnesses, cables, etc. If there is a more complicated wiring diagram, the output signals of the control object 17 are compared in block 14 of the comparison with external codes received from the input 29 of the device via the multiplexer 19. External codes are received, for example, from an input device from a punched tape in the presence of a enable pulse at the input 30 of the device. The rest of the algorithm of the device is unchanged.

Claims (1)

Invention Formula 0 five A device for controlling electrical installation, containing a clock pulse generator, two counters, outputs connected respectively to information inputs of the first and second decoders, the first ultiplexer, a trigger, two OR elements and the AND element, the first input connected to the output of the block compared to Q The decoder is a group of device outputs for connecting to the eg group of inputs of the control object, the reset input of the trigger is connected to the output of the first OR element, characterized in that, in order to reduce the hardware cost of the device, the third decoder, the I block, the second multiplexer, the encoder, the third element OR, the two elements EXCLUSIVE OR, and the element OR-NOT, with the first input of the first element OR, the reset input of the second counter and the input of the clock generator connected to the device enable input, The input of the first counter and the summing input of the second counter are connected respectively to the first and second outputs of the third decoder, the information input of which is connected to the output of the clock generator and the building input of the first and second decoders and the comparison unit, the output connected to the first inputs of the first and second of the second element EXCLUSIVE OR OR, the second inputs of which are connected respectively to the outputs of the second and third elements OR and the first and second inputs of the element OR-NOT the transfer output of the second account The sensor is connected with the second input of the first element OR, the group of inputs of the encoder and the second element OR are connected to the output group of the first multiplexer, the control input connected to the control input of the third decoder and the output of the trigger, the installation input of which is connected to the output of the first element EXCLUSIVE OR, first group of inputs and group of outputs of the block element And are connected respectively to the group of outputs of the second decoder and the first group of information inputs of the first multiplexer, the second group of information inputs of the block of elements And connected to the second 1 input of the block of elements And, and is a group of inputs of the device for connecting the group of outputs of the control object, the output of the second multi- the plexer is connected to the first information input of the comparison unit, the second information input of which is connected to the group of outputs of the encoder and to the group of inputs of the third element ILR1, output the house connected to the second input of the element I, the information input and transfer output of the first counter are respectively the installation input and the output of the verification end and the input contact code of the device, the encoder output group forms the output of the output contact code of the device, the first and second information inputs and the control the input of the second multiplexer is connected respectively to the output of the first counter, the input of the contact code setting and the mode input of the device, the outputs of the AND element, the OR-NOT element and the first and second elements These are EXCLUSIVE OR form a group of indicator outputs of the device.