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Troubleshooting By Symptom; Run Led Does Not Turn On; Run Led Continues Flashing (low-speed) - Mitsubishi Electric MELSEC iQ-R C User Manual

Melsec iq-r series, intelligent function module, application.
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3.5

Troubleshooting by Symptom

If any of the functions of a C intelligent function module does not operate properly, perform troubleshooting by checking the
following items. If the ERR LED is flashing, clear the error using an engineering tool.

RUN LED does not turn ON

Check the following items.
Check item
Is ERR LED ON?
Is ERR LED flashing?
Is the power turned OFF, or is the CPU module reset while accessing files?

RUN LED continues flashing (low-speed)

Check the following items.
Flashing status (low-speed) of RUN LED is displayed during execution of script file (STARTUP.CMD).
After taking corrective actions corresponding to the 'Check item' given below, correct the script file and the user program that
is activated from the script file.
Check item
Is the script file stored to the standard ROM?
Cannot the script file in the standard ROM be overwritten?
3 TROUBLESHOOTING
56
3.5 Troubleshooting by Symptom
Corrective action
System watchdog timer error occurred.
• Check if user tasks with higher priority occupy the system.
• Take corrective actions against the occurrence of any system watchdog
timer error (3C00H). (Page 60 Error Code List)
The hardware failure has occurred.
Take corrective actions according to the events registered in the event history.
Reset the CPU module, or turn the power OFF and ON to start the C
intelligent function module.
Corrective action
• Store the unprocessed script file in an SD memory card and restart the C
intelligent function module.
• Initialize C intelligent function module.
• Store the unprocessed script file in an SD memory card and restart the C
intelligent function module.
• Check free space of the standard ROM.
• Initialize C intelligent function module.

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