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keithsmithAug 17, 2025
Why is the ERROR/ALARM LED on my Panasonic FPG-PP21 Controller ON?
- TTyrone CollinsAug 17, 2025
If the ERROR/ALARM LED is ON because the system watchdog timer has been activated, set the mode selector of the Panasonic Controller from RUN to PROG mode and turn the power off and then on. If the ERROR/ALARM LED turns on again, there is probably an abnormality in the CPU. Please contact your dealer. If the program execution time is too long, set the mode selector from PROG to RUN mode. If the ERROR/ALARM LED turns on, check if instructions such as JP or LOOP are programmed in such a way that a scan can never finish. Also, make sure that interrupt instructions are executed in succession. Finally, check if the ERROR/ALARM LED is flashing.