Siemens SIMATIC S7-1500 Function Manual page 280

5. For "Client interface" select the client interface that you want to use for the instruction.
We select the "ProductionLine" client interface in the example.
STEP 7 now interconnects the "ProductionLine" client interface with the parameters of the
OPC_UA_Connect instruction:
"ProductionLine" is the interface that the OPC UA client of the example (Page 249) uses
for data exchange with the OPC UA server "ProductionLine".
6. Using drag-and-drop, move the "UA_NamespaceGetIndexList" instruction into the
program editor.
You will find the instruction under "Instructions > Communication > OPC UA" in the TIA
Portal.
Select the "Multi-instance" call option.
Click the toolbox symbol (LAD and FBD) or the small green box below the instance name
(STL and SCL) if the editor is not already open.
Select the client interface that you want to use ("ProductionLine" in the example).
STEP 7 now automatically interconnects all parameters of the
"OPC_UA_NamespaceGetIndexList" instruction:
Communication
Function Manual, 11/2019, A5E03735815-AH
9.4 Using the S7-1500 CPU as an OPC UA client
OPC UA communication
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