3 of 3 people found this helpful
Yes, you could trigger a new Event Frame from either condition - bad value or flatline.
1. BadVal('AttributeOfInterest') - this will return True if the underlying tag has a SYSTEM digital state
2. NumOfChanges('AttributeOfInterest','*-10m','*') = 0 - this will return True if there have been no snapshot value changes in the last 10 minutes
3. SecSinceChange('AttributeOfInterest') > 600 - this is an alternative option to number 2 above
Thanks John - I will try these out and get back to you.
2 of 2 people found this helpful
If you implement NumOfChanges() or SecSinceChange() function, pay attention to the ExcMax setting of your watchdog tag. Generally, monitoring the Device Status, the Heartbeat, and the IO Rate would provide a good overview of the interface status.