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christine94Aug 4, 2025
What to do if READY LED of CPU module turns off in Mitsubishi Electric MELSEC iQ-R-R6PSFM Controller?
- Ddale70Aug 5, 2025
If the READY LED of the CPU module turns off, here are a few things you can try: 1. Remove the CPU module from the main base unit, and then mount it back on the main base unit. 2. Replace the CPU module if a major error has occurred. 3. Replace the power supply module if there was an error in it before replacement. 4. If an error occurred in a module other than the power supply module, repeatedly supply power to the system, returning the modules back to the system one by one. The last module mounted immediately before the READY LED turned off has failed, so replace that module. 5. Wait for at least five seconds after powering off, and then power the system on again.
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