Siemens SIMATIC S7-1500 Function Manual page 220

Creating a server interface for a companion specification
To create a server interface for a companion specification with STEP 7 (TIA Portal), proceed
as follows:
1. Select the CPU that you want to use as an OPC UA server.
2. In the project tree, click "OPC UA communication > Server interfaces".
3. Double-click "Add new server interface".
4. To select this type of server interface, click "Companion specification".
A general name for the new server interface is entered in the dialog, for example
"Server_Interface_1".
5. Change the name of the new server interface so that it is descriptive in your project.
The name should have the following structure according to Euromap 77:
"IMM_<Manufacturer>_<Serial number>".
The example uses the name "IMM_Manufacturer_01234".
Communication
Function Manual, 11/2019, A5E03735815-AH
OPC UA communication
9.3 Using the S7-1500 as an OPC UA server
219