Error/Alarm Led Is On - Panasonic FPS Series User Manual

FPΣ User's Manual

11.4 ERROR/ALARM LED is ON

If the ERROR/ALARM LED is on, the system watchdog timer has been activated and the
operation of the PLC has been stopped. There are two ways to remedy the problem:
•
Set the mode selector of the PLC 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.
Check if the ERROR/ALARM LED is flashing. See "ERROR/ALARM LED is
-
Flashing" on page 264.
•
Set the mode selector from PROG to RUN mode. If the ERROR/ALARM LED turns
on, the program execution time is too long.
Check if instructions such as JP or LOOP are programmed in such a way that a
-
scan can never finish.
Make sure that interrupt instructions are executed in succession.
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11.4 ERROR/ALARM LED is ON
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