OPC UA communication
9.3 Using the S7-1500 as an OPC UA server
Communication
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Function Manual, 05/2021, A5E03735815-AJ
Provision of controller alarms by the OPC UA server
When an OPC UA client wants to receive alarms of the S7-1500 CPU, it needs to subscribe to
OPC UA events (MonitoredEventItems).
For this purpose, the address space of the OPC UA server of the S7-1500 CPU contains
corresponding nodes that are "Event-Notifiers" and create a subscription for the OPC UA
clients to receive the alarms.
For completeness, we also mention that further type definitions are contained in the server
address space for this purpose as nodes under "Types". Type definitions under
"BaseEventType" and "ConditionType" ensure that the fields used by SIMATIC alarms are also
provided in the OPC UA server.
After the activation of OPC UA Alarms and Conditions (CPU properties in the hardware
configuration), the OPC UA address space of the S7-1500 CPU thus reflects the various alarm
types (controller alarms) as described above:
•
ProcessDiagnostics
Corresponds to the PLC supervision alarms with ProDiag
•
SystemDiagnostics
Corresponds to the system diagnostics alarms
•
UserProgram
Corresponds to the program alarms
•
Graph
Corresponds to GRAPH alarms
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