OPC UA Server¶

On this page you can configure everything to receive CMTK data via the OPC UA protocol. To install the OPC UA Server, download the APP and install it on the CMTK.

The server settings can then be found under Settings > IoT Communication > OPC UA Server

Activate OPC UA server¶

To activate the server, activate the toggle OPC UA active and save the change.

Authentication methods¶

In principle, several authentication methods are available for authentication between the OPC UA server and OPC UA clients. These can be activated or deactivated separately. It is also possible to use the different authentication methods in parallel.

Anonymous¶

If this authentication method is enabled, an OPC UA client can connect without a separate login.

Username/Password¶

This authentication method requires a user name and password to connect to the OPC UA server. You can specify these in the input mask and activate them by saving.

Certificate¶

It is possible to use a user certificate and corresponding key created by an OPC UA client for authentication. To do this, you must upload the corresponding user certificate from the client to the CMTK using the corresponding function. Only the following certificate formats are valid, .crt, .pem or .der.

Server Certificate¶

A server certificate can be used to authenticate the server. The CA certificate can be downloaded in the Certificates area. If the client does not support CA certificates, the server certificate in the OPC UA server settings can also be used. Both certificates can be renewed using the Renew certificate button in the Certificates area.

The format of the server certificate can be chosen, from .crt, .der or .pem

Supported encryptions¶

In principle, there are various options available for encrypting communication between OPC UA clients and OPC UA servers. This is selected by the OPC UA client. The following encryptions are supported by the CMTK's OPC UA server:

• None
• Basic128Rsa15
• Basic256
• Basic256Sha256
• Aes128Sha256RsaOaep

OPC UA message structure, port and data rate¶

Information on the basic structure of the process data of an OPC UA message can be found under Information on the node set. You will see an example of the message structure.

The address space looks like this. The marked area shows the process data of a BCM.