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Redundancy switching circuit and method of parallel PLCs (programmable logic controllers)

A technology of redundant switching and parallel connection, which is applied in the direction of electrical program control, program control in sequence/logic controllers, instruments, etc., can solve problems such as hidden safety hazards and lack of control flexibility, and achieve normal operation, reliable switching, The effect of reliable switching control

Active Publication Date: 2017-05-17
BEIJING AEROSPACE AUTOMATIC CONTROL RES INST +1
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  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

In actual use, if a fault occurs in the parallel PLC, its power supply can only be cut off by local control, and it cannot be cut off remotely. The control flexibility is lacking, especially when the launch process of the launch vehicle reaches the unattended stage. Operators cannot go to perform power-off operations, and there are potential safety hazards

Method used

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  • Redundancy switching circuit and method of parallel PLCs (programmable logic controllers)
  • Redundancy switching circuit and method of parallel PLCs (programmable logic controllers)
  • Redundancy switching circuit and method of parallel PLCs (programmable logic controllers)

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specific Embodiment

[0071] In the design of a launch vehicle test and launch control system, two sets of PLCs with the same configuration are used in parallel: PLC1 and PLC2. Each set of PLC is equipped with a PLC power module, a PLC control module, a PLC communication module, a PLC input module, and a PLC output module. Each set of PLC receives remote control signals through the communication module for remote control.

[0072] In the PLC program design, one input of the PLC input module corresponds to one %I variable in the program, and one input connects to the normal closed contact of the %I variable in the program; one output of the PLC output module corresponds to one %Q variable in the program , the connection of the %Q variable in the program corresponds to the connection of one output of the PLC output module.

[0073] The relay KD1 normally closed contact is connected in series to the PLC1 power supply main line, and the relay KD2 normally closed contact is connected in series to the PL...

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Abstract

The invention discloses a redundancy switching circuit and method of parallel PLCs (programmable logic controllers). The redundancy switching circuit and method has the advantages that the switching circuit for the parallel PLCs is designed according to the features of the parallel PLCs and a PLC control program, and the operation states and power supply of the two parallel PLCs are monitored in real time to serve as switching executing conditions; when one PLC fails and the other PLC is normal in state and power supply, the power supply of the failed PLC can be safely and reliably cut off, system launch control can be performed smoothly, and reliable switching of the parallel PLCs can be achieved; when the redundancy switching circuit is actually used in multiple carrier rocket PLC launch control system, the redundancy switching circuit works normally and can effectively achieve the reliable switching control of the parallel PLCs.

Description

technical field [0001] The invention relates to a redundant switching circuit and method of a parallel PLC, which is applied to a launch control system for launch vehicles. Background technique [0002] In the design of launch control system for launch vehicle test, parallel PLC is used to complete the launch control operation of the system, and two sets of PLC control devices are connected in parallel for input and output. In actual use, if a fault occurs in the parallel PLC, its power supply can only be cut off by local control, and it cannot be cut off remotely. The control flexibility is lacking, especially when the launch process of the launch vehicle reaches the unattended stage. Operators cannot go to perform power-off operations, and there are potential safety hazards. [0003] In order to ensure the reliable working state of the parallel PLC, especially when a set of PLC fails, it should be able to reliably cut off its power supply and ensure the smooth operation o...

Claims

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Application Information

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IPC IPC(8): G05B19/05
CPCG05B19/058
Inventor 陈放田建宇孙兆牛王雨萌李学锋余力凡苏磊权赫张嗣锋杨岫婷
Owner BEIJING AEROSPACE AUTOMATIC CONTROL RES INST
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