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1. Fault phenomenon: The main body works normally, but once the expansion port is connected to the expansion module, the plc does not run, and the RUN light does not light.
2. Fault reason: The expansion module is damaged, the expansion module 0V, +24V is short-circuited, resulting in no 24V working voltage when connected with the PLC.
3. Note: Please make sure that the expansion module is normal. You can confirm whether the expansion module works normally by the replacement method.
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