When The Run Led Does Not Turn On; When The Boot Led Flickers - Mitsubishi Electric Q26UD(E)HCPU User Manual

15.1.5

When the RUN LED does not turn on

Check the following items.
The RUN LED of the CPU module flickers.
The ERR. LED of the CPU module is on or flickering.
The RUN LED turns on when the CPU module is reset and
set to RUN again.
15.1.6

When the BOOT LED flickers

Turn off the programmable controller and remove the memory card. Turn the DIP switches SW2 and SW3 to ON.
When the BOOT LED turns on after power is resupplied, boot operation from the standard ROM starts.
If the BOOT LED does not turn on, the possible cause is the hardware failure of the CPU module.
Please consult your local Mitsubishi representative.
Check item
CHAPTER 15 TROUBLESHOOTING
Corrective action
Reset the CPU module or set it to RUN from STOP.
Check the error details by the programming tool.
( Page 282, Section 15.2)
The module is possibly affected by excessive noise. Take
noise reduction measures. (
If the same problem frequently occurs even after the noise
reduction measures are taken, the programmable controller
possibly has any defective part or poor connection.
Please consult your local Mitsubishi representative.
Page 651, Appendix 8)
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