OPC UA communication
9.3 Using the S7-1500 as an OPC UA server
Communication
Function Manual, 05/2021, A5E03735815-AJ
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Address model for Alarms and Conditions
The following figure shows the nodes of the OPC UA Alarms and Conditions address model.
Special features
•
When pending alarms go out or are acknowledged, they no longer enter the OCP UA
Alarms and Conditions system area via the ConditionRefresh method. They are then
"invisible" to OPC UA Alarms and Conditions and thus to the connected OPC UA clients.
This fact influences e.g. statistical evaluations of alarm progressions.
•
To avoid a high alarm frequency for the Overloads Alarm if the number of alarms oscillates
around the maximum value, the limit for triggering the alarm is higher than the limit for
canceling this alarm: The value for this difference is displayed in the "OverloadHysteresis"
node.
Example: Maximum number of alarms: 200, OverloadHysteresis: 3.
Overloads alarm is triggered starting with 200 alarms and is only canceled if there are
fewer than 197 alarms. If the number of alarms increases again, it will be triggered again
when 200 alarms are exceeded.
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