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
①
Instructions for preparation of method calls
②
Method calls
③
Instructions for "clean-up" after completed method calls
Figure 9-59 Run sequence for a method call in the OPC UA server
Optional instructions (reading out the status of a connection / reading out node IDs of
nodes with known hierarchy of the address space)
•
OPC_UA_ConnectionGetStatus
•
OPC_UA_TranslatePathList
①
Instructions for preparation of read and write operations with inserted instruction for request-
ing, for example, the NodeIDs of nodes of the OPC UA server.
②
You can determine the connection status between the establishment and termination of the
connection in parallel with other instructions.
③
Instructions for "clean-up"
Figure 9-60 Run sequence of optional instructions
Convenient editors in STEP 7
The OPC UA client instructions are described in detail in the reference part (STEP 7
information system). For parameter assignment of the instructions, a convenient editor is
available in the TIA Portal – the connection parameter assignment (Page 339).
We recommend starting with the connection parameter assignment for the first program
draft and using additional instructions and manually optimizing the program as required.
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