Mitsubishi Electric Melsec Q Series User Manual page 115

9 Troubleshooting
9.2 Troubleshooting
9.2.1 When "RUN" LED is turned off
Check item
Is power source is supplied?
Is capacity of the power source
module sufficient?
Is the watchdog time an error?
Is the module properly attached to
the base unit?
Is the slot type set to "empty" in the
I/O assignment setting of the PC
parameter at GX Developer?
Table 9.2.1-1 When "RUN" LED is turned off
Check that supply voltage of the power source is
within the rating.
Calculate the consumption current of CPU
module, I/O module, and intelligent function
module attached to the base unit, and check that
the power capacity is sufficient.
Reset CPU module, and check whether it is
turned on.
If RUN LED is not turned on even after doing the
above, the module may have a failure. Consult
with a nearest sales agent or our company branch
for the symptom of the failure.
Check the module attachment status.
Set the slot type to "Intelligent".
9 - 3
Action
QE81WH
Reference
Section
3.1
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Section
7.6.1