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The data source is an OPC UA DA server. This type of the OPC server is a later version of the OPC DA standard. It allows you to easily receive data from remote computers without installing additional software or using a complex configuration procedure.



Fig. 9. OPC UA.


Tag Name - you need to specify the ID of an OPC tag that you want to link to another data source. An OPC server supports hierarchical representation of data, and you can specify a path to the tag in the OPC tag tree as node1.node2.tag (dot is used as a separator). When creating a tag name, it is recommended to use only Latin letters and numbers.


Data Type - this field is used to specify the data type of OPC tag. When necessary, in the case the data types of different sources do not match, the program will try to convert such data types. When Auto is specified in the Data Type field, the program will use the data type of paired source.


Server Options - this button opens an additional window to configure an OPC server (see Fig. 10). Kindly note that you can only configure one OPC UA server, and it will have the same parameters for all connections.



Fig. 10. OPC UA server parameters.


Name - the name of an OPC server displayed when connecting to the server from an OPC client.


IP Address and Port - network parameters used to connect to the server. IP address is set by default and allows you to connect to the server via any network interface available on the computer. You can use any server port. However, it is recommended to use a port number greater than 1000.


Login and Password - when login and password are set, a server will verify these credentials while connecting OPC clients. You may leave these fields empty.


Certificate storage location - if a path to the certificate’s store is specified in this field, an OPC client will use a secure connection to connect to the server, and its public certificate will be placed in that folder. There should be three subfolders in this folder:


private – a folder with the certificate of the OPC server itself (server_cert.der) and its private key (server_key.der). Without these certificates, the program cannot encode traffic.

rejected - this folder contains certificates of the clients that are denied access to the server.

trusted - this folder contains certificates of the clients that are allowed access to the server. Until the client's certificate appears in this folder, the client will not be able to access the server.


Local discovery server address is the address of a special server on the network or on a local computer that stores information about all active OPC UA servers and facilitates connection to them. If you do not have an LDS server, leave this field blank.