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 three sequential control design methods of PLC ladder diagram with an example, which based on the example of the kind of S7-200 PLC from SIEMENS.
本文以西门子s7 - 200型号PLC为例，用一个具体的实例介绍了PLC梯形图的三种顺序控制设计方法。
The motion flow, PLC control soft and hard design of C5112 vertical lathe were analyzed, and the PLC wiring diagram and the ladder diagram were given.
详细分析了C5 112立式车床动作流程，PLC控制系统软、硬件设计，并给出了PL C接线图和梯形图。
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