当内部自测试程序启动完成后SCM点亮OKLED,只要模板功能正常该OKLED灯一直点亮,如果当电源接通至系统时该OKLED熄灭,关断PLC电源并确认该模板正确地安装在基板上,再打开电源,如果OK LED仍然处于OFF状态,表明SCM很可能有硬件故障,应该返还处理,模板上的另外两个LEDs没有用到。
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