In Yokogawa CI Server, you can preview the OPC UA security certificate in the Engineering Module as shown below.

Enginggineering Module -> Configuration -> Equipment -> OPC UA Client -> Certificates

These certificates are for OPC UA client connection and they are organized in the following folder in the Yokogawa CI Server Engineering Module application.

• Trusted
• Rejected
• Own Certificate

As an example, the Trusted certificate content in the Yokogawa CI Server Engineering Module looks as follows.

And the “Own Certificate” looks like this in the Yokogawwa CI Server Engineering Module.

You can also view these OPC UA client connection security certificates using the Microsoft Windows Explorer in the following directory.

C:\Users\Public\Yokogawa\tls\pki\opxuac\pkiclient

The OPC UA client connections security certificates are organized ine a more detail format in the Microsoft Windows Explorer.

• Deleted
• Issuers
• Trusted
• Rejected
• Own

The OPC UA server security certificates can be found in the following directory.

C:\Users\Public\Yokogawa\tls\pki\opxuas\pkiserver

And has the following directory structre.

• Trusted
• Rejected
• Own

I hope that helps!