A redundant switching circuit and method for parallel PLC
A technology of redundant switching and parallel connection, which is applied in the direction of electrical program control, sequence/logic controller program control, program control, etc., can solve the problems of lack of control flexibility and hidden safety hazards, and achieve normal and reliable switching Controlled, Reliable Switching Effects
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[0070] 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.
[0071] 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.
[0072] 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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