This paper introduces the approach and method of design of PLC ladder diagram based on relay diagram in old equipment alteration, some problems in design are discussed.
介绍了用PLC改造旧设备时，根据继电器电路图设计梯形图的方法与步骤，并介绍了设计中需要注意的问题。
This paper introduces the approach and method of design of PLC ladder diagram based on relay diagram in old equipment alteration, some problems in design are discussed.
介绍了用PLC改造旧设备时，根据继电器电路图设计梯形图的方法与步骤，并介绍了设计中需要注意的问题。
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