描述
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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