■ When an ALARM LED is ON
<Condition: a system watchdog timer error occurs>
• If the ALARM LED is turned ON again, there is probably an abnormality in the FP1.
Please contact your dealer.
• If the ERR. LED is turned ON, go to page 205, ■ When an ERR. LED is ON.
• If the ALARM LED is turned ON, the program execution time is too long. Check the
program, referring the following:
- Check if instructions such as JP or LOOP are programmed in such a way that a scan
can never finish.
- Check that interrupt instructions are executed in succession.
Set the mode selector of the programmable
controller from PROG. to RUN.
Set the mode selector of the programmable
controller from RUN to PROG. and turn
the power OFF and then ON.
209
7-2. Troubleshooting
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