The OPC UA IO server allows you to configure your Ewon device to act as an OPC UA client capable of retrieving values from OPC UA servers such as those embedded in PLCs and HMIs.

This IO server allows the Ewon device to connect to a maximum of 3 different OPC UA devices/servers.

Certificates Management

The Certificate Management section allows you to upload, download, trust, and delete the certificates required for encryption and authentication between the Ewon device and the OPC-UA server.

Certificate management for the Ewon device’s OPC-UA server functionality is managed here as well. See the OPC-UA server section for more information about this feature.

Click on the button to add upload a new certificate.

To download, delete, or trust a certificate, right click on the appropriate certificate and select your option from the list.

Topic Configuration

Topics give common properties to groups of OPC UA tags such as whether polling is enabled or disabled for these tags, their poll rate, and the destination device type and address.

Endpoint URL

Enter the address of the OPC UA device you want to retrieve tags from.

The address must be in the format: opc.tcp://[server]:[port].

Authentication settings

Set the Authentication settings to be compatible with the settings of your OPC UA server.

Security policy

Set the Security policy to be compatible with the settings of your OPC UA server.

Security mode

Set the Security mode to be compatible with the settings of your OPC UA server.

More information about configuring the OPC UA client is available on the Ewon website.