It highly recommended to setup the Watchdogs for any task configured. Have a look to the online help if needed. Consider a programming mistakes (e.g. endless-loop) captures the cpu endlessly..., the PLC-runtime will collapse and block somehow. With the activated WD the runtime detects the malfunction and generates a WD exception at the ctrlX-diagnosis system. Otherwise without WD the whole system gets effected and even the diagnosis will not be fed anymore. It will be hard to realisze the PLC-programm as reasonable for such a blockade in case the time-expanding of the programm growns randomly.
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