Description
通用型S5PLC的CPU模块上往往包括有通信接口、EPROM插槽、运行开关等，故障的隐蔽性更大，因为更换CPU模块的费用很大，所以对它的故障分析、判断要尤为仔细。
检修实例：一台PLC合上电源时无法将开关拨到RUN状态，错误指示灯先闪烁后常亮，断电复位后故障依旧，更换CPU模块后运行正常。在进行芯片级维修时更换了CPU但故障灯仍然不停闪烁，至到更换了通信借口板后功能才恢复正常。
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