xLadder user manual-V2.0.0.6

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:

173

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