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
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9.3.3.9 Diagnostic settings of the server
Diagnostics
You can specify the scope of the diagnostics of the OPC UA server in the CPU settings.
To change the diagnostics scope, navigate to the "OPC UA > Server > Diagnostics" area.
Figure 9-25 Diagnostic settings of OPC UA server
Default setting
The default setting is a diagnostics behavior that supports the most important diagnostics
without appreciably increasing the communication load.
You enable diagnostics for subscriptions when the OPC UA server also uses subscriptions, i.e.
if necessary during the commissioning phase only.
Reason: A large volume of diagnostic activity generates a high communication load in the
CPU and may suppress other important messages. Or, the high volume of diagnostics may
result in important messages disappearing in the mass of messages and being ignored.
Additional information
You will find additional information on the meaning and effect of the settings shown above
here (Page 304).