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MELSEC-Q
8 TROUBLESHOOTING
8.2 Troubleshooting
8.2.1 When the "RUN" LED is flashing or turned off
(1) When flashing
Check item Corrective action
Is the mode set to the offset/gain setting mode?
Reset switch 4 of the intelligent function module setting for
GX Developer to the normal mode (see Section 4.5).
(2) When off
Check item Corrective action
Is the power being supplied?
Confirm that the supply voltage for the power supply module
is within the rated range.
Is the capacity of the power supply module adequate?
Calculate the current consumption of the CPU module, I/O
module and intelligent function module mounted on the base
unit to see if the power supply capacity is adequate.
Has a watchdog timer error occurred?
Reset the PLC CPU and verify that it is lit. If the RUN LED
does not light even after doing this, the module may be
malfunctioning. Contact the nearest distributor or branch
office with a description of the problem.
Is the module correctly mounted on the base unit? Check the mounting condition of the module.
Is a module change enabled during an online module
change?
Refer to Chapter 7 and take corrective action.
8.2.2 When the "ERROR" LED is on or flashing
(1) When on
Check item Corrective action
Is an error being generated?
Confirm the error code and take corrective action described
in Section 8.1.
(2) When flashing
Check item Corrective action
Is intelligent function module setting switch 5 set to "other
than 0"?
Using GX Developer parameter setting, set intelligent
function module setting switch 5 to "0" (see Section 4.5).
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