OPC Toolbox uses MATLAB objects to implement OPC HDA client functionality. The OPC HDA client object allows you to connect to the server and, when a connection is established, to access information about the server, retrieve the server's name space, and read data from the server. See Create an OPC HDA Client Object for information on creating a client object.
By default, when data is read from the historian, the results are returned as OPC HDA data objects. These data objects provide a structured mechanism for storing OPC HDA data. Using data objects, you can visualize and manipulate historical data for later processing in MATLAB®.
Before creating and connecting an OPC HDA client object to an OPC HDA server, you must locate the server on a particular host. The following sections describe how to locate, connect to, and browse the data on a server.