Siemens SIMATIC S7-1500 Function Manual page 201

OPC UA communication
9.3 Using the S7-1500 as an OPC UA server
Injection molding machine as an example for companion specification
In this example, a server interface contains the following elements:
● OPC UA nodes which you can write with an OPC UA client to receive information about
this injection molding machine (in readable PLC tags)
● OPC UA nodes which you can write with an OPC UA client to transfer values to the
injection molding machine (in writable PLC tags)
● OPC UA nodes which you can call with an OPC UA client to start functions of the
injection molding machine (via server methods)
This server interface enables a default view of a CPU, which can be used to control an
injection molding machine.
For injection molding machines, the companion specification "Euromap" defines a whole
series of OPC UA nodes which you can combine in a server interface.
Other OPC UA nodes of the CPU are not included in this server interface. This provides a
better overview.
Example of user-defined server interface
A CPU should control the production of workpieces. Production begins when a production
job arrives from the higher-level control system.
The production jobs are transferred via a server method: A control system transmits
information on a workpiece by calling the server method in the CPU. This server method also
starts production.
The control system, i.e. the connected OPC UA client, should only see this one server
method. Therefore, you create a user-defined server interface in the CPU and assign the
server method to this server interface. You enable only this server interface for OPC UA
clients and thus limit the view of the CPU to this one function.
See also
Using OPC UA companion specifications (Page 206)
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Function Manual, 11/2019, A5E03735815-AH
Communication