Abstract
This paper introduces the application of Siemens S7-200 PLC in standby power supply. PLC collects the normal running state signal of the primary equipment, which is used as the starting condition and locking condition of the standby power supply automatically input. It realizes different functions through programming to adapt to different running modes. Through PLC and king view in the laboratory, I verified the operation mode. It is also increases the obstacles, enriches the content of the standby self-casting system, and realizes the simulation of the joint adjustment with PLC. It is more obvious to watch the practical application of the stand auto-casting and the diversification of its functions.
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