8.5.5. Bridging and Tunnelling
OPC bridging with tunnelling OPC means linking OPC servers across a network. Here's how it's done:
Bridging two OPC servers over a network requires a tunnelling connection.
This scenario involves setting up DataHub instances on both machines to act as OPC clients to the respective OPC servers. The DataHub instances then interface with each other over a TCP tunnelling connection. Configure the DataHub instance on the machine with the most uptime to be the tunnelling master and the other DataHub instance to be the tunnelling slave. For simplicity sake, we recommend that you configure all bridges on one machine.
Bridging two OPC clients over a network also requires a tunnelling connection.
This scenario involves setting up DataHub instances on both machines to act as OPC servers to the respective OPC clients (see above). The DataHub instances then need to interface with each other over a TCP tunnelling connection. Configure the DataHub instance on the machine with the most uptime to be the tunnelling master and the other DataHub instance to be the tunnelling slave. For simplicity sake, we recommend that you configure all bridges on one machine.