When The "Run" Led Is Flashing Or Turned Off; When The "Err." Led Is On Or Flashing; When The "Alm" Led Is Turned On Or Flashing - Mitsubishi Electric MELSEC Q Series User Manual

8 TROUBLESHOOTING
8.2 Troubleshooting

8.2.1 When the "RUN" LED is flashing or turned off

Is the mode set to the offset/gain setting mode?
Is power being supplied?
Is the capacity of the power supply module adequate?
Has a watchdog timer error occurred?
Is the module correctly mounted on the base unit?
Is a module change enabled during Online module change? Refer to Chapter 7 and take corrective action.

8.2.2 When the "ERR." LED is on or flashing

Is an error being generated?
Is intelligent function module setting switch 5 set to "other
than 0"?

8.2.3 When the "ALM" LED is turned on or flashing

Has the warning output occurred?
Has the disconnection occurred?
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(1) When flashing
Check item
(2) When off
Check item
(1) When on
Check item
(2) When flashing
Check item
(1) When on
Check item
(2) When flashing
Check item
Corrective action
Reset switch 4 of the intelligent function module switch
setting for GX Developer to the normal mode (Refer to
Section 4.5).
Corrective action
Confirm that the supply voltage for the power supply module
is within the rated range.
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.
Reset the programmable controller 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.
Check the mounting condition of the module.
Corrective action
Confirm Error code and take corrective action described in
Section 8.1.
Corrective action
Using GX Developer parameter setting, set intelligent
function module setting switch 5 to "0" (Refer to Section 4.5).
Corrective action
Check Warning output flag (buffer memory address 48,
Un\G48).
Corrective action
Check Disconnection detection flag (buffer memory address
49, Un\G49).
MELSEC-Q
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