OPC UA communication
9.3 Using the S7-1500 as an OPC UA server
Communication
176 Function Manual, 11/2019, A5E03735815-AH
Settings remain stored
If you have already enabled the server and made settings, those settings are not lost if the
server is disabled. The settings are saved as before and are available when you enable the
server again.
Application name
The application name is the name of the OPC UA application and applies to the server and
the client. The name is displayed under "OPC UA > General":
● The default for the application name is: "SIMATIC.S7-1500.OPC-UA.Application:PLC_1".
● The default consists of "SIMATIC.S7-1500.OPC-UA.Application:" and the name of the
CPU selected under "General > Product information > Name", in this case "PLC_1".
● The OPC UA server uses this application name to identify itself to a communication
partner (OPC UA client), for example, when an OPC UA client uses the discovery service
to detect accessible servers.
● The displayed application name uses the OPC UA client of the CPU when connecting to
an OPC UA Server. This means that the CPU enters this application name automatically
as "ApplicationName" for the instruction "OPC_UA_Connect" (tag of type
"OPC_UA_SessionConnectInfo" at the parameter "SessionConnectInfo" of the instruction
"OPC_UA_Connect").
When you program the instruction "OPC_UA_Connect" you must therefore assign an
empty string to the "ApplicationName". You can use the application name, for example, to
identify the client and its sessions (SessionNames) for diagnostic purposes.
If you have activated the server, you can also use a different name that is meaningful in your
project and that fulfills the requirements of your project, e.g. for worldwide uniqueness.
The example below originates from UaExpert:
Changing the application name
To change the application name, follow these steps:
1. Select the CPU. Click on the CPU symbol (for example in the network view).
2. Click "OPC UA > General" in the properties of the CPU.
3. Enter a meaningful name.
Please note that the application name is also entered on the certificate (Subject Alternative
Name) and you may have to generate an existing certificate again after changing the
application name.
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