【IC697VAL348】【IC697VAL348】

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输出接口电路通常有三种类型：继电器输出型、晶体管输出型和晶闸管输出则。每种输出电路都采用电气隔离技术，电源由外部提供，输出电流一般为1.5—2A，输出电流的额定值与负载的性质有关。 
    为使PLC避免受瞬间大电流的作用而损坏，输出端外部接线必须采用保护措施：一是输出公共端接熔断器；二是采用保护电路，对交流感件负载，一般用阻容吸收回路；对直流感性负载用续流二极管。 
    *部分的PLC的输出端子采用分组式和分隔式。对于晶体管输出型还有源型输出和漏型输出两种形式。*部分的欧美品牌的PLC采用源型输出，而*部分的亚洲品牌的PLC采用漏型输出。图4所示为采用分组式的PLC继电器输出电路图，图5和图6所示分别为采用分组式的PLC源型和漏型晶体管直流输出电路图。 

：张亮（工程师）    专线：
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