Mitsubishi Q00JCPU User Manual page 427

6
FUNCTIONS
(4) Precautions
(a) Watchdog timer error
(b) Watchdog timer reset when program is executed repeatedly by FOR and
An error of 0 to 10 ms occurs in the measurement time of the watchdog timer. Set
the watchdog timer for a desired value by taking such an error into account.
NEXT instructions
The watchdog timer can also be reset by executing the WDT instruction in a
sequence program.
If the watchdog timer expires while the FOR and NEXT instructions are
repetitiously executed, reset the watchdog time with the WDT instruction.
Program for repetition processing
M0
Figure 6.83 Watchdog timer reset when FOR and NEXT instructions are executed
FOR K1000
WDT reset
WDT
NEXT
6.16 Watchdog Timer (WDT)
1
2
3
Repetition
(1000 times)
4
5
6
7
8
6
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