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
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Function Manual, 05/2021, A5E03735815-AJ
9.3.7.2 Server state transition diagnostics
Information on the server state
S7-1500 CPUs as of firmware version V2.8 are able to create an entry in the diagnostic buffer
upon state changes of the OPC UA server.
The diagnostic buffer displays the new state.
The cause of the state change is also displayed, such as download to the CPU, POWER OFF -
POWER ON transition, user program instruction or service request from a partner (client).
Requirement
The "Change of OPC UA server status" option is selected (OPC UA > Server > Diagnostics) in
the OPC UA properties of the CPU.
Note
If this option is selected, the CPU also automatically enters the lowest set security policy into
the diagnostic buffer after startup.
Examples
If the OPC UA server of the CPU shuts down due to a download process and then starts with a
valid new configuration, the diagnostic buffer shows new server state, e.g. Shutdown =>
Starting => Running.
If the OPC UA server shuts down due to a download process and the server cannot start
because the type dictionary is too large, the diagnostic buffer finally shows the state "Failed"
(Shutdown => Starting => Failed).