OPC UA Client
The OPC UA Client can be adapted to different environments, which may require different levels of security. For this purpose, the OPC UA Client provides various configurable security features.
These values can be set by means of the Device Security Settings (OPC UA Client) of the PLC.
Setting up an encrypted connection to the UAExpert client
The "UaExpert" OPC UA Client is freely accessible software that you can download from the Internet. You can use this client to connect to the CODESYS OPC UA Server. The following description refers to this program. Other OPC UA Clients work in a similar way.
Start the UaExpert program.
Click the command.
The Add Server dialog opens.
In the tree view, expand .
Select the connection type Basic256Sha256 – Sign & Encrypt (uatcp-uasc-uabinary) and click OK to close the dialog.
Click the command.
The Certificate Validation dialog opens with an error message.
Select the Accept the server certificate temporarily for this session option and click Continue.
In CODESYS, click the
symbol.The view is refreshed.
Select the Quarantined Certificates folder.
The UaExpert@ client certificate is displayed in the right view.
Drag the certificate to the Trusted Certificates folder.
Now the client certificate is classified as "trusted" by the server.
In the UaExpert client, click the command.
The Certificate Validation dialog opens with an error message.
Select the Accept the server certificate temporarily for this session option and click Continue.
The connection is established and objects are displayed in the Address Space view.
Using the OPC UA Client to change a variable
In the Address Space view, in the UaExpert client, expand the object.
The variables of the global variable list are visible.
Select the variables and drag them to the Data Access View.
The variables and their current values are shown.
Change the variable values by double-clicking the Value field.