描述
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状态，称为梯形图的逻辑解算。梯形图中逻辑解算是按从左至右、从上到下的顺序进行的。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。
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