Technical data

Hardware Information
6-13
SIMATIC Panel PC 670 Computing Unit Equipment Manual
Edition 12/01
WD reactions
If the WD is not retriggered within the set time (by driver or SOM program), the
following reactions are triggered:
Reaction Option
Acknowledge WD Always
Initiate reset on the computing unit Adjustable
Send IRQ on computing unit Adjustable
The reactions you want to have triggered can be set by drivers or the SOM
program.
WD monitoring times, TWD
The monitoring times can be adjusted in increments of one second over the range
from 3 to 255 seconds.
Note
If the watchdog time is modified after the watchdog has been activated – in other
words, while the watchdog is running – the watchdog will be retriggered as a
result!