Panasonic FP-E Programming Manual page 577

Precautions during programming
The F142 (WDT) instruction may be used any number of times.
To change the time−out time through operation, use the process described below.
1) Execute the F142 (WDT) instruction immediately prior to the block to be processed, and specify the
preset.
2) When the processing has been completed, execute the F142 (WDT) instruction again, and enter a
preset with a new value.
If the time required for one scan exceeds 640 ms, the system watching dog timer will be activated, regardless
of the time−out time set with the F142 (WDT) instruction, and operation will be interrupted and output turned
off.
If you want to reset an erroneous condition caused by the system watching dog timer, clear that condition
using one of the following methods:
− Using programming tool software.
− Turning the TEST/INITIALIZE switch to the INITIALIZE side.
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High−level Instructions
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