描述
输入接线：输入接线一般不要太长。但如果环境干扰较小，电压降不大时，输入接线可适当长些；输入／输出线不能用同一根电缆，输入／输出线要分开；尽可能采用常开触点形式连接到输入端，使编制的梯形图与继电器原理图一致，便于阅读。
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