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Siemens Industry Online Support
Siemens AG
Entry type: FAQ Entry ID: 109755858, Entry date: 02/22/2018
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Which restrictions do you have to consider with the OPC UA Server of S7-1500 CPU with the firmware V2.0.x or V2.1.x in Compatibility mode of firmware V2.5?

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Note the following restriction in the S7-1500 CPU with firmware V2.5 if the CPU was configured in an earlier version (<V15) with firmware V2.0.x or V2.1.x.

Description
When operating a CPU configuration with firmware V2.0.x or V2.1.x, the sampling interval of 50ms cannot be used in Compatibility mode of firmware V2.5. The smallest possible sampling interval in this case is 100ms.

Note
When changing modules, from FW 2.1 to FW 2.6/2.8, for example, the scanning interval is reset. In the "Change device" dialog, in TIA Portal V16 and higher, when upgrading you get the following warning:

  • "The smallest sampling interval for OPC UA was reset to the default value."

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https://www.siemens.com/cybersecurity#Ouraspiration.
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