R911282508 REXROTH

IS200DVIBH1B GE
IS200IGDMH1BBBIS200IGDMH1B
IS200RAPAG1B
VMIVME7750
IS210MACCH2AEGIS210MACCH2A
IS200WETAH1AECGE燃机卡件
IS200TVIBH2B

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描述

一般PLC是可以直接将指令发到控制回路里,但也可能先由继电器中转。打个比方,如果你PLC的输出口带电是24VDC的,但是你的控制回路里画的图需要PLC供的节点却是220VAC的,那么你就必须在PLC输出口加上一个继电器,即指令发出时继电器动作,但后让控制回路的节点接到继电器的常开或常闭点上。也是根据情况选择是否使用继电器。

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