iDect FC6A series User Manual page 440

13: T
ROUBLESHOOTING
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 5-52.
Troubleshooting Diagram 8
The interrupt/catch input
cannot receive short pulses.
Are the input ON/OFF
voltage levels correct?
Call IDEC for assistance.
13-14
YES
*1
timer?
NO
NO
YES
FC6A S M S
ERIES ICRO MART
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
A - -O T U ' M
LL IN NE YPE SER S ANUAL
FC9Y-B1722
END