1784-PCD1
作者:2016/8/4 7:45:14

1784-PCD1

1784-PCD1

1784-PCD1

  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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