Rievtech PR-12 Series, User Manual And Programmers Manual

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6.12.7 Watchdog Reset
WDR clear watchdog time.When the scan cycle is
greater than the watchdog time, the WDR makes the
watchdog not issue a warning.
Using “ WDR ” instruction should be careful.The
following programs can be performed after the scan
cycle is completed.
1.Communication
2.I/O update (except for immediate I/O)
3.Forced update
4.SM bits update
5.Run time diagnostic program
6.STOP (stop) instruction for interrupt routine
Attention : If you expect scan time will be more than 500 ms, you should use the
WDR instruction to re trigger the watchdog timer.
Example: