Example - Ladder Diagram
WDT Example
The WDT instruction resets the watchdog timer during the execution of a sequence program.
Ladder Diagram Example
For this example, the watchdog timer setting value is 10ms.
When the value, 1000, is assigned to the data registers, D0 and D1, the scan time is around 17 ~ 18ms.
This is greater than the watchdog timer set value of 10ms.
The User WDT error will appear.
WDTP
The WDTP one-shot instruction resets the watchdog timer during the execution of a sequence program.
Every time this instruction executes, it energizes the output only once.
Ladder Diagram Example
For this example, the watchdog timer setting value is 10ms.
When the value, 1000, is assigned to the data registers, D0 and D1, the scan time is around 17 ~ 18ms.
This is greater than the watchdog timer set value of 10ms.
The User WDT error will appear.