描述
CC-MCAR01 HONEYWELL
PLC控制系统的输入电路设计。PLC供电电源一般为AC85—240V，适应电源范围较宽，但为了抗干扰，应加装电源净化元件（如电源滤波器、1:1隔离变压器等）;隔离变压器也可以采用双隔离技术，即变压器的初、次级线圈屏蔽层与初级电气中性点接大地，次级线圈屏蔽层接PLC输入电路的地，以减小高低频脉冲干扰。
PLC输入电路电源一般应采用DC 24V,同时其带负载时要注意容量，并作好防短路措施，这对系统供电安全和PLC安全至关重要，因为该电源的过载或短路都将影响PLC的运行，一般选用电源的容量为输入电路功率的两倍，PLC输入电路电源支路加装适宜的熔丝，防止短路。
PLC控制系统的输出电路设计。依据生产工艺要求，各种指示灯、变频器/数字直流调速器的启动停止应采用晶体管输出，它适应于高频动作，并且响应时间短;如果PLC系统输出频率为每分钟6次以下，应首选继电器输出，采用这种方法，输出电路的设计简单，抗干扰和带负载能力强。
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