QuickOPC User's Guide and Reference
Binding Operations
There are several things you can do with OPC Data: you can read from them, write to them, or subscribe to their changes. Not all bindings should be involved in all operations, and you therefore need to specify the operations that are of interest to you.
You can choose one of the following values, or their combination:
If you want a combination, you can use a predefined symbolic name such as ReadAndWrite, ReadAndSubscribe, etc. By default, the BindingOperations argument is set to PointBindingOperations.ReadAndSubscribe, meaning that the binding will be involved in Reads and Subscribes, but not in Writes.