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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Function Manual, 05/2021, A5E03735815-AJ
The client user decides whether the server certificate is to be trusted.
The user at the client side now has to decide whether the server certificate is to be trusted. If
the user trusts the server certificate, the client stores the server certificate in its directory
containing the trusted server certificates.
The following example shows a dialog of the client "UA Sample Client". When the user clicks
the "Yes" button, the client trusts the server certificate:
Figure 9-20 Dialog of the client "UA Sample Client"
Where does a client certificate come from?
Client of the S7-1500
If you are using the OPC UA client of an S7-1500 CPU (OPC UA client enabled), you can create
certificates for these clients with STEP 7 V15 and higher.
1.
In the project tree, select the CPU you want to use as a client.
2. Double-click "Device configuration".
3. In the properties of the CPU, click "Protection & Security > Certificate manager".
4. Double-click "<Add new>" in the "Device certificates" table.
STEP 7 opens a dialog.
5. Click the "Add" button.
6. Select the "OPC UA client" entry from the "Usage" list.
Note:
The IP addresses under which the CPU can be accessed in your system must be entered
under "Subject Alternative Name (SAN)".
You must therefore configure the IP interfaces of the CPU before you generate a client
certificate.
7. Click "OK".
STEP 7 now shows the client certificate in the "Device certificates" table.