Publish Tags through the Ewon OPCUA Server

To enable the functionality, go to the menu:

Setup > System > Main > Net services > OPCUA

Multiple parameters are listed:
• Check the option “Enable OPCUA server” to enable the OPCUA server.
• Select the groups of Tags to publish. Multiple choices are allowed.
These groups refer to the Instant Value property, which is located in the Tag Visibility from the Tag Setup panel.
• Choose the Login Type. Anonymous, User/Password or Certificate
• Choose the port (default is 4840)
The server listens on all network interfaces (LAN, WAN and VPN).

Click on “Update” to validate the parameters.

The service will be restarted if needed and new parameters will be applied. It is not necessary to restart any service or reboot the Ewon Flexy after changing any OPCUA parameter.

Configuring the Tags to publish through the OPCUA server

By creating/modifying the Ewon Tags as usual, you will be able to configure if the Tag is accessible through OPCUA by selecting a Tag Group.  Choose an Instant Value Group that matches the selected group of the OPCUA Server configuration.

Configuring an OPCUA client

1. Launch UaExpert
2. Click on Server > Add Server
3. Click on Advanced
4. Fill in the fields according to your configuration:
5. The endpoint URL should be in the form “opc.tcp://EWON_IP_ADDRESS:PORT”
   
   
   
   
6. Choose the server in the Project > Servers list
   
   The published Tags are under Root > Objects > EwonTags
   
   
   
   Drag and drop the Tags to monitor from the Tags list to the Data Access View panel.
   The values are refreshed automatically
   
   
   
   The list in Root > Objects > EwonTags is automatically updated when a Tag is added or removed in the groups of published Tags in the Ewon configuration.
   The value (or type) of a published Tag is automatically updated in the Data Access View when it changes.