SU1576394A1 - Apparatus for checking condition of switches and traffic lights in system for electric safety interlocking - Google Patents

Abstract

The invention relates to control systems for railway automation and telemechanics. The purpose of the invention is to increase reliability. The device contains a shaper 2 clock pulses, a block of 4 entering information on the state of arrows and traffic lights, blocks 8 and 9 of decoding and fixing information on the state of arrows and traffic lights, blocks 5 of comparison and 7 registering failures, block 6 of reset, blocks 10-13 of delay The outputs of blocks 10 and 13 are connected to the inputs of block 9, and the inputs of blocks 11 and 12 to the outputs of block 8. The output of block 4 is connected to the information input of block 8 and the input of block 13, and the output of driver 2 is connected to the clock input of block 8 and input block 9. The outputs of block 9 are connected to the same inputs of blocks 5 and 7, The outputs of blocks 11 and 12 are connected to other inputs. In the event of a malfunction or interference in the device, there appears a mismatch in the operation of blocks 8 and 9 due to the presence of blocks 10–13 delays in the signal paths. The mismatch is fixed by blocks 5 and 7, which provide signals for stopping the operation of the device. 1 il.

Description

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The invention relates to control systems for railway automation and telemechanics.

The purpose of the invention is to increase reliability.

The drawing shows a block diagram of the device.

The device contains a pulse generator 1, a clock pulse shaper, a drive 3 of error information, a block of 4 input of information on the state of arrows and traffic lights, a comparison block 5, a reset block 6, a fault recording block 7, blocks 8 and 9 of decryption and fixation of information on the state of arrows and traffic lights and blocks 10-13 delay. The output of the generator 1 is connected to the information input of the imager 2, the output of which is connected to the input of the delay unit 10 and the clock input of the unit 8, the outputs connected to the inputs of the delay units 11 and 12. The output of the block 4 of entering information about the state of arrows and traffic lights is connected to the information input of block 8 and the input of block 13 of delay, the output connected to the information input of block 9, the clock input of which is connected to the output of block 10 of delay, the first output is connected to the first inputs of block 5 of comparison and the failure recording unit 7, and the second with the second input of the block 7, the other two inputs of which are connected to the outputs of the delay blocks 11 and 12, and the output of the block 12 is also connected to the second input of the comparison unit 5. The output of block 5 is connected to the reset input of the imager 2 and the input of the reset block 6, the output of which is connected to the reset inputs of blocks 8 and 9. The output of block 7 is connected to the input of the accumulator 3, the output of which is connected to the input of the generator 1.

The device works as follows.

Generator 1 generates signals of a given frequency, which are converted by shaper 2 into square pulses of the same frequency. The pulses received by him are necessary for the operation of blocks 8 and 9, to the inputs of which they come. The operations performed by blocks 8 and 9 depend on the parameters received from block 4. One of the outputs of any block 8 and 9 is the output of the system.

When the system is healthy, blocks 8 and 9 operate synchronously, which is checked by block 5 connected to the outputs of these blocks. In the event of a mismatch in their processing unit 5 turns off the driver 2 pulses, thereby prohibiting the occurrence of the active signal at the outputs of blocks 8 and 9. At the same time, the reset block b starts, which switches blocks 8 and 9 to the initial state, thereby synchronizing their work. As a result, unit 5 turns on shaper 2, restoring normal operation of blocks 8 and 9.

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If the resulting mismatch is the result of pulsed aperiodic interference, it will be random and will not be repeated in other close cycles.

If the discrepancy was caused by the failure of the system elements and the effect of periodic noise, it will be repeated regularly in each cycle of operation of blocks 8 and 9.

Such regularity of failures of blocks 8 and 9 is a distinctive feature of the permanent failure of the system in relation to its accidental failure under the influence of individual aperiodic interference. To detect cases of permanent malfunction of the control system against accidental failure, block 7 is used to register failures. In the event of a block failure. 1, the registration of failures generates a signal to disconnect from generator 1, however, the latter continues to work due to the energy accumulated in accumulator 3 and designed for three to four cycles of operation of blocks 8 and 9. In the event that the mismatch occurred as a result of action on blocks 8 and If there are 9 separate aperiodic interferences, the next cycle will not fail in blocks 8 and 9, and in this case generator 1 is not turned off. If the mismatch was not accidental, but as a result of a malfunction of any element or as a result of the effect of periodic interference, then blocks 8 and 9 never

0 will not be completed until the end of the cycle and block 7 will fail to fix in each cycle a failure, in this case, after three or four cycles of operation of blocks 8 and 9, generator 1 will stop working. In this way, the faulty device will shut down completely.

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Claims (1)

Invention Formula Device for monitoring the state of arrows and traffic lights in electrical systems 0 centralization and automatic blocking, containing the block for entering information about the state of arrows and traffic lights, clock generator connected with the output to the input of the clock pulse generator, blocks for decoding and fixing information about the state of arrows and traffic lights, comparison unit, reset unit and block for registering failures the output of which is connected to the cumulative register, and the first inputs are connected to the outputs of the first block for decrypting and fixing information, one of which is connected to the first input of the comparator block, the output of which is It is connected to the control inputs of the pulse former and the reset unit, the output connected to the reset inputs of the decoding and latching information of the state of arrows and traffic lights, and the information and clock inputs of the second state of the dithering and latching information about the state of the arrows and traffic lights are connected respectively to block outputs 0 5 15763946 input of information about the state of arrows and light of the state of arrows and traffic lights, and the inputs of the tofors and the clock pulse pulse generator of the other two delay blocks are connected to one another, characterized in that with the aim of higher outputs of the second decryption unit and neither reliability, supplied with fixing units of information about the state of the support arrows, the inputs of two of which are 5 and traffic lights, and their exits correspond to the above-mentioned outputs of the unit input with other inputs of the register-information unit and the clock generator of failures, and the output is four The second block of pulses is located, and the outputs are connected to the inputs of the first control unit with the second input of the block for decrypting and fixing the information and comparison.