IDEC FT1A Series User Manual page 356

14: T
ROUBLESHOOTING
Troubleshooting Diagram 8
Watchdog timer error occurs and
the SmartAXIS 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 5-66.
Troubleshooting Diagram 9
The interrupt/catch input
cannot receive short pulses.
Are the input ON/OFF
voltage levels correct?
Call IDEC for assistance.
14-16
YES
*1
timer?
NO
NO
YES
S AXIS P
MART RO
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. For FBD, the watchdog timer
cannot be reset in the program.
Make sure of correct input voltage.
ON voltage: 15V DC minimum
OFF voltage: 5V DC maximum
/L U ' M FT9Y-B1378
ITE SER S ANUAL
END