Self-Diagnostic and TroubleshootingFP0
11 − 7
11.2 Troubleshooting
11.2.2 ERROR/ALARM LED is ON
The system watchdog timer has been activated and the operation of FP0 has been
stopped.
<Condition>
If the ERROR/ALARM LED is turned ON , the program execution time is too long.
Check:
Set the mode switch from RUN to PROG. and turn the power OFF and then ON.
<Procedure 1 >
If the ERROR/ALARM LED is turned ON again, there is probably an abnormality
in the FP0. Please contact your dealer.
If the ERROR/ALARM LED is blinked, go to section 11.2.1.
If instructions such as JP or LOOP are programmed in such a way
that a scan can never finish.
that interrupt instructions are executed in succession.
Set the mode switch from PROG. to RUN.
<Procedure 2 >
11.2.3 All LEDs are OFF
Check the power supply wiring.
Disconnect the power supply wiring to the other devices if the power supplied to the
FP0 control unit is shared with them.
Check if the power supplied to the FP0 control unit is in the range of the rating.
Be sure to check the fluctuation in the power supply.
If the LEDs on the FP0 control unit turn ON at this moment, the capacity of the
power supply is not enough to control other devices as well.
Prepare another power supply for other devices or increase the capacity of the
power supply.
<Procedure 1 >
<Procedure 2>
<Procedure 3>
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