描述
如果PLC输出带电磁线圈等感性负载，负载断电时会对PLC的输出造成浪涌电流的冲击，为此，对直流感性负载应在其旁边并接续流二极管，对交流感性负载应并接浪涌吸收电路，可有效保护PLC。当PLC扫描频率为10次／min以下时，既可以采用继电器输出方式，也可以采用PLC输出驱动中间继电器或者固态继电器（SSR），再驱动负载
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