1783-MS10T1783-MS10T AB模块

在分析PLC控制系统的功能时，可以将它想象成一个继电器控制系统中的控制箱，其外部接线图描述了这个控制箱的外部接线，梯形图是这个控制箱的内部“线路图”，梯形图中的输入继电器和输出继电器是这个控制箱与外部世界的“接口继电器”，这样就可以用分析继电器电路图的方法来分析PLC控制系统。在分析时可以将梯形图中输入继电器的触点想象成对应的外部输入器件的触点或电路，将输出继电器的线圈想象成对应的外部负载的线圈。外部负载的线圈除了受梯形图的控制外，还可能受外部触点的控制。

   图1是某摇臂钻床的继电器控制电路原理图。钻床的主轴电机用接触器KM1控制，摇臂的升降电机用KM2和KM3控制，立柱的松开和夹紧电机用KM4和KM5控制。图2和图4-16是实现具有相同功能的PLC的外部接线图和梯形图。

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