描述
当向PLC基本单元供电时，基本单元表面上设置的［POWER］LED指示灯会亮。如果电源合上但［POWER］LED指示灯不亮，请确认电源接线。另外，若同一电源有驱动传感器等时，请确认有无负载短路或过电流。若不是上述原因，则可能是PLC内混入导电性异物或其他异常情况，使基本单元内的保险丝熔断，此时可通过更换保险丝来解决。
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