When The "L Err." Led Turns On; When The "Sd"/"Rd" Led Does Not Turn On Dimly - Mitsubishi Electric MELSEC QS SERIES User Manual

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TROUBLESHOOTING

9.2.8 When the "L ERR." LED turns on

The following explains the case when the "L ERR." LED turns on at power ON of the safety
remote I/O module or during operation of the programmable controller.
If the "L ERR." LED turns on when the "ERR." LED is off, replace the safety remote I/O
module.
When the "ERR." LED is flashing, refer to the flowchart in Section 9.2.3.
When the "ERR." LED is on, refer to the flowchart in Section 9.2.5.

9.2.9 When the "SD"/"RD" LED does not turn on dimly

The following explains the case when the "SD"/"RD" LED does not turn on dimly at power
ON of the safety remote I/O module or during operation of the programmable controller.
If the "SD"/"RD" LED does not turn on dimly when the "SAFETY" LED is on, replace the
safety remote I/O module.
When the "SAFETY" LED is not on, refer to the flowchart in Section 9.2.4.
9.2 Troubleshooting with LEDs
9.2.8 When the "L ERR." LED turns on
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