13: T
ROUBLESHOOTING
13-16
FC5A M
ICRO
S
MART
U
SER
’
S
M
ANUAL
FC9Y-B1268
Troubleshooting Diagram 8
YES
NO
Is the scan time longer than
340 ms?
NOP instruction can reset the watchdog
timer. Insert NOP in the ladder diagram so
that the watchdog timer does not exceed
340 ms.
Call IDEC for assistance.
Watchdog timer error occurs
and the CPU does not run.
Troubleshooting Diagram 9
Are the input ON/OFF
voltage levels correct?
Call IDEC for assistance.
The interrupt/catch input can-
not receive short pulses.
END
YES
NO
Make sure of correct input voltage.
ON voltage:
15V DC minimum
OFF voltage: 5V DC maximum
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