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
7. STEP 7 displays a dialog with which you can select an XML file.
This XML file describes a address space of an OPC UA server.
The address space of an OPC UA server contains all PLC tags and server methods published
by an OPC UA server.
OPC UA clients can access this address space:
- Read PLC tags
- Write PLC tags
- Calling Server Methods
The address space of an OPC UA server can be divided into one or more server interfaces.
For creating server interfaces, see: Creating a server interface for companion specification
(Page 253).
8. Create a read list in this client interface.
To do this, follow these steps:
– Click "Add new read list" in the left section of the editor.
STEP 7 adds a new list named "ReadList_1".
For the example, change the name to "ReadListProduct"
– Now add the new read list of the PLC tags that you want to read from the OPC UA
server.
In the example the "NewProduct" and "ProductNumber" tags are added to the
"ReadListProduct" read list.
Select the "NewProduct" tag in the right-hand field of the editor ("OPC UA Server
interface"). Drag the "NewProduct" tag to the "ReadProduct" read list in the middle field
of the editor. Follow the same procedure with the "ProductNumber" tag.
The figure below shows the right field of the editor.
Figure 9-63 Read list in the OPC UA server interface