Using CA-signed key-pair certificates with DeltaV OPC UA nodes requires that you request a CA-signed public-key certificate from a certificate authority, combine the certificate with respective private key and import it into the DeltaV system. The DeltaV interface does not support all the steps required to request and combine CA-signed certificates. Contact Emerson support for information about configuring CA-signed certificates with your DeltaV OPC UA application.
Additionally, you can set up user authentication for the communications between clients and servers. User authentication requires that client/server communications use a DeltaV user account with OPC UA authority.
In order for Username/Password logon authentication to work on a DeltaV workstation client, you must trust the OPC UA server certificate.