Siemens SIMATIC ET 200AL, System Manual

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OPC UA communication
9.3 Using the S7-1500 as an OPC UA server
Communication
Function Manual, 05/2021, A5E03735815-AJ
295
BrowsePath DataType Explanations
AckedState.TransitionTime UtcTime Time at which the alarm was acknowledged.
ZERO if not acknowledged or not acknowl-
edgeable.
ActiveState LocalizedText "Active" or "Inactive"
ActiveState.Id Boolean Set when "active"
9.3.6.4 Activating Alarms and Conditions
Requirements
• S7-1500 CPU firmware version V2.9 or higher
• Runtime license for OPC UA were purchased according to the license specifications and set
in the CPU properties
Procedure
To activate alarms through OPC UA Alarms and Conditions, proceed as follows:
1.
In the CPU properties, go to the "OPC UA > Server > General" area.
2. Select the "Enable Alarms and Conditions on the OPC UA server" option.
The corresponding types and objects that can trigger events only become visible in the
address space when the option is activated.
3. If required, also activate the option "Allow message acknowledgment by OPC UA client".
In this case, every connected OPC UA client can acknowledge an alarm requiring
acknowledgment with the "Acknowledge" method.
Recommendation: Activate diagnostics "Requests of a remote OPC UA client failed"
When the OPC UA server cannot allocate sufficient memory, it is not possible to generate OPC
UA alarms in this state; a message loss for OPC UA clients is possible.
Therefore, you should activate the diagnostics "Requests of a remote OPC UA client failed" to
diagnose this state (Properties of the CPU > OPC UA > Server > Diagnostics).
In addition, you should also activate the option "Summarize diagnostics in case of high
message volume".
As soon as sufficient memory is available again, OPC UA clients should call the
ConditionRefresh method to receive the current state of the alarm system.
See also
Methods for OPC UA Alarms and Conditions (Page 297)
Request of a remote client failed (Page 309)