2. FAULT DIAGNOSIS
2.2 Troubleshooting
II
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2.2.2 When in trouble
If the system does not operate as planned or if there is any trouble in the operation, confirm the following
points and then contact the Mitsubishi Service Center.
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Examples of trouble
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• The power does not turn ON.
• The external power turns ON, but the control power does not turn ON.
• The power turns OFF.
• The communication alarm display "RIOERR1"/"RIOERR2" LED turns ON.
• The 5VDC output display "POWER" LED turns OFF.
• The CPU error display "CPU-E" turns ON (flickers).
• The operation display "RUN" LED does not turn ON.
• The load does not turn ON/OFF even though the corresponding output is turned ON or OFF in the
ladder monitor.
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