This example demonstrates that using the OPC Classic Library, it is possible to connect to multiple servers from one model. The ready-to-use example uses the same server twice (due to limited availability of accessible OPC servers for testing), so in order to fully explore using multiple servers, you need to:

1. Have access to a second OPC server, either on your local host or remote.
2. Change hostName and serverName accordingly in component opcServer or opcServer1.
3. Change the corresponding itemName in the connected block so that it connects to a simulation item on the new server.

The readReal component reads data from item "Saw-toothed Waves.Real8" on "Matrikon.OPC.Simulation.1". The data is then passed through a Butterworth lowpass filter with a cut-off frequency of 2.0 Hz. Finally, the component writeReal writes the filtered data to item "Bucket Brigade.Real8" on "Matrikon.OPC.Simulation.1".

There are several possible applications of being able to connect to more than one server from one model, such as processing data read from one server and writing the modified data to another server.

Plot of the saw-toothed signal read from component opcServer.

Plot of the filtered signal and the sampled data written to component opcServer1.