OPC UA communication
9.4 Using the S7-1500 CPU as an OPC UA client
Communication
254 Function Manual, 11/2019, A5E03735815-AH
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 9-59 Read list in the OPC UA server interface
Alternative:
You can also select a new read list by dragging the right field of the editor ("OPC UA
Server interface") to a node of the type Object or Folder and then dragging it to "Add new
read list" in the left field of the editor. The new read list then contains all PLC tags of the
node that has been moved.
In the example, select the object "Data_for_OPC_UA_Clients", which contains the tags
"NewProduct" and "ProductNumber". STEP 7 generates the new read list
"Data_for_OPC_UA_Clients". In addition, the object contains the tag "Temperature".
Delete the "Temperature" tag from the read list. Since they should not be read in the
example.
Change the name of the read list in "ReadListProduct".
The following figure shows the content of the read list:
Figure 9-60 Read list
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