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。
RELIANCE ELECTRIC 0-57412-E USPP 057412E
RELIANCE ELECTRIC 57C-412 USPP 57C412
RELIANCE ELECTRIC 0-57412-D USPP 057412D
RELIANCE ELECTRIC 0-57412-2 USPP 0574122
RELIANCE ELECTRIC 0-51862-1 NSPP 0518621
RELIANCE ELECTRIC 3KA847597-SP USPP 3KA847597SP
RELIANCE ELECTRIC 866270-R NSPP 866270R
RELIANCE ELECTRIC 0574111A USPP 0574111A
RELIANCE ELECTRIC 0-57411-2 USPP 0574112
RELIANCE ELECTRIC 0-57411-2D USPP 0574112D
RELIANCE ELECTRIC 0-57411-2E USPP 0574112E
