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Analysis of common problems of PLC:

The 1.Y output is the breakdown, causes the output load is too large;

The 2 power module is bad, the overall load, output abnormal;

3 input module and output module anomalies, such as the output signal is not stable, the output module overall no output, this is generally environmental reasons, led to the module is acid and alkali corrosion, high-temperature unsoldering or internal circuit;