2)根据梯形图中各触点的状态和逻辑关系，求出与图中各线圈对应的编程元件的ON/OFF状态。，称为梯形图的逻辑解算。逻辑解算是按梯形图中从上到下、从左至右的顺序进行的。解算的结果，马上可以被后面的逻辑解算所利用。逻辑解算是根据输入映像寄存器中的值，而不是根据解算瞬时外部输入触点的状态来进行的。
2)手动复位型热继电器，其常闭触点可以在PLC的输出电路中与控制电机的交流接触器的线圈串联。
SR9BFB2G1
VT130H7U4500B
这个目的不能独立地达到，因为实际问题确实访碍某些理想操作的发生。要记住的是，观察一个问题的方法不止一种，这个非常短小精悍的擦黑板程序就是其中一种方法。
设计输入电路时，应尽量采用常开触点，如果只能用常闭触点，梯形图中对应触点的常开/常闭类型应与继电器电路相反。
1．输入接线
接线图主要用于安装接线、线路检查、线路维修和故障处理。它表示了设备电控系充各单元和各元器件间的接线关系，并标注出所需数据，如接线端子号、连接导线参数等。实际应用中通常与电路图和位置图一起使用。
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