I/O Status LED Off (Input)

What does IO-STATUS-LED-OFF mean?

The I/O status indicator LED for a specific input point is not illuminated, suggesting that the external input signal is either not present, not strong enough, or not being processed correctly by the I/O module. This can be due to a missing or incorrect external power supply to the I/O module or an internal module failure.

• External power supply to the I/O module is not provided or does not meet the specified voltage requirements.
• The physical state of the input device does not correspond to the I/O indicator LED, potentially due to wiring issues.
• Internal failure of the I/O module preventing correct input signal detection.

Click steps to track your progress.

1. 1

   Verify that the external power supply for the I/O module is connected and that its voltage meets the module's specifications.

2. 2

   Use the engineering tool to perform a forced ON/OFF operation on the device concerned and observe if the I/O indicator LED responds accordingly.

3. 3

   If the I/O indicator LED error persists after troubleshooting, consult your local Mitsubishi Electric representative.