OPC XML Demo Servers
OPC XML Sample Server
The OPC XML Sample Server is not installed with the product(s), but is made available on the Internet. You can use it for your explorations and tests. The server's URL is
Our example code also refers to this server, so that the examples can be run without having to set up a server locally.
The server is based on the sample server code from OPC Foundation. It provides some OPC data of its own, and it wraps two OPC COM-based servers (OPC-DA 2.0 and OPC-DA 3.0). It contains a combination of items of various data types, static and dynamic, some readable and some also writeable.
OPC XML does not define a way for server discovery (browsing for servers). For this reason, if you are using user interface components such as the browsing dialogs or controls, you need to specify the server manually, using its URL.
The following picture illustrates the address space of the sample server: