IDEC MICROSmart FC6A Series User Manual page 625

Troubleshooting Diagram 7
Watchdog timer error occurs and
the user program does not run.
Did you create a program
where the scan time exceeds the time
configured for the watchdog
Call IDEC for assistance.
*1 See "Watchdog Timer Setting" on page 5-60.
Troubleshooting Diagram 8
The interrupt/catch input
cannot receive short pulses.
Are the input ON/OFF
voltage levels correct?
Call IDEC for assistance.
YES
*1
timer?
NO
NO
YES
FC6A S MICROS
ERIES
NOP instruction can reset the watchdog timer.
Insert a NOP instruction into the ladder diagram
so the time configured for the watchdog timer is
not exceeded.
Make sure of correct input voltage.
ON voltage: 15V DC minimum
OFF voltage: 5V DC maximum
U ' M FC9Y-B1722
MART SER S ANUAL
13: T
ROUBLESHOOTING
END
13-17