Each OpcDaClient has a Poll Scheduler container slot (OpcPollScheduler), with the standard collection of properties, as described in “About poll components” in the Drivers Guide. Note the poll scheduler is “device level” (each OpcDaClient), versus a single poll scheduler at the “network level.”

Polling by the station is used only when asynchronous messaging is not in use—otherwise, the server sends change-of-value messages for updates. See properties of the Points device extension (OpcPointDeviceExt) for related details.