OPC UA communication
9.3 Using the S7-1500 as an OPC UA server
Communication
218 Function Manual, 11/2019, A5E03735815-AH
UDT "XmlElement"
An XmlElement is a serialized XML fragment (UTF-8 string).
For the basic data type "XmlElement", create the following PLC data type:
Figure 9-43 "XmlElement" UDT
Example: Structure of EUInformation with UDT "LocalizedText"
Figure 9-44 Example: Structure of EUInformation with UDT "LocalizedText"
9.3.4.6 Creating a server interface for companion specification
For basic information on companion specifications, refer to the section "Using OPC UA
companion specifications (Page 206)". The benefits of the Euromap 77 companion
scpecification, which provides a model for injection molding machines, is also discussed in
detail there.
Using this companion standard, the S7-1500 CPU can control an injection molding machine,
for example, and provide an OPC UA client, such as a higher-level MES system, with an
interface for accessing the functions and tags of injection molding machine.
An OPC UA server interface of the type "Companion Standard" limits the access of clients to
exactly those functions and tags that are required, for example, for higher-level systems
(MES systems).
The following description shows how to create a server interface in STEP 7 (TIA Portal)
which contains only the Euromap 77 companion specification.
If you want to make OPC UA clients accessible to other tags or methods than those required
for the management of an injection molding machine, simply create another OPC UA server
interface. In this way, you can clearly arrange the functionality of the CPU as OPC UA
server.
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