1784-CP14

1784-CP14

1784-CP14

 当你的系统输出频率为每分钟6次以下时，应***继电器输出，因其电路设计简单，抗干扰和带负载能力强。当频率为10次／min以下时，既可采用继电器输出方式；也可采用PLC输出驱动达林顿三极管（5—10A），再驱动负载（见图2），可大大减小。

    2、抗干扰与外部互锁当 PLC输出带***负载，负载断电时会对PLC的输出造成浪涌电流的冲击，为此，对直流***负载应在其旁边并接续流二极管，对交流***负载应并接浪涌吸收电路，可有效保护PLC。当两个物理量的输出在PLC内部已进行软件互锁后，在PLC的外部也应进行互锁，以加强系统的可靠性。

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