Siemens SIMATIC ET 200AL, System Manual

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OPC UA communication
9.3 Using the S7-1500 as an OPC UA server
Communication
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9.3.4.8 Generating OPC UA nodes based on local data mappings of FB types and UDTs
If you want to make instance data from FBs or UDTs of the CPU accessible to OPC UA clients,
you can have these instance data assignments automatically made as of TIA Portal version
V17.
You only have to map the FB types or the UDTs to suitable OPC UA data types of imported
reference namespaces. Based on these mappings created in STEP 7 (TIA Portal), generate the
required nodes in the server interface for each FB instance or for each UDT usage during the
compile.
If you extend your program and add more FB instances or UDT usages, or if you add existing
instances delete, you do not need to worry about adapting the server interface: STEP 7
automatically adjusts the server interface when compiling the program.
Example
• You create a function block (FB) in the user program of the CPU and define in the "Static"
area of the interface of the FB the parameters that form the "memory" of the FB. The
instances (values) of this parameter are to be accessible for OPC UA clients.
• You create an OPC UA data type (e.g. with SiOME) with elements that correspond to the
data type the parameters in the static area of interface of the FB. The order of the
elements does not matter. Then import the reference nodeset file (reference namespace)
as a reference name space.
The following figure shows the assignment of elements as comparison of the reference
namespace view (server interface) and the OPC UA elements view (program).