Siemens SIMATIC ET 200AL, System Manual

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OPC UA communication
9.4 Using the S7-1500 CPU as an OPC UA client
Communication
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Function Manual, 05/2021, A5E03735815-AJ
9. If you want assign new values to PLC tags, create a write list in this client interface.
To do this, follow these steps:
– Click "Add new write list" in the left section of the editor.
STEP 7 adds a new list with the name "ReadList_1".
For the example, change the name to "WriteListStatus".
– Now add the new write list of all OPC UA server tags to which you want to assign new
values.
In the example, add the "WriteListStatus" tag to the write list "ProductionEnabled".
Select the Tag of right field of the editor ("OPC UA Server interface"). Drag the tag to
the write list in the middle field of the editor.
Alternative:
You can also create a new write list by selecting a node of the type Object or Folder in the
right field of the editor ("OPC UA server interface") and then dragging to "Add new write
list" in the left field of the editor.
The new write list then contains all tags of the relevant node.
In the example, select the object "Data_from_OPC_UA_Clients", which contains the tag
"ProductionEnabled". STEP 7 generates the new write list "Data_from_OPC_UA_Clients".
Change the name in "WriteListStatus".
The following figure shows the content of the write list:
Figure 9-65 Write list