150 Programming the PFC using WAGO-I/O-PRO
WAGO-I/O-SYSTEM 750
750-880, 750-880/025-000 ETHERNET Programmable Fieldbus Controller
Manual
Version 1.0.1
The following applies to cyclic tasks with watchdog activated:
Note
Reference for Watchdog Settings!
For each tasks created, a watchdog can be enabled that monitors the execution
time of a task.
If the task runtime exceeds the specified watchdog time (e.g., t#200 ms), then the
watchdog event has occurred.
The runtime system stops the IEC program and reports an error.
Watchdog
t
Watchdog
Task
Task
Event
Call interval of task
Task runtime
Figure 58: Watchdog runtime is less than the task runtime
If the watchdog time set is greater than the call interval of the task, then the
watchdog is restarted for each task call interval.
Watchdog
t
Task
Watchdog
Task
Call interval of task
Re-start of watchdog at the
end of call interval of task
Task runtime
Figure 59: Watchdog runtime is greater than the task call interval
Recommendation:
Set the watchdog time greater than the task runtime and less than the task call
interval.
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