6 Data Access specific usage of Services ToC Previous Next

6.1 General ToC Previous Next

OPC 10000-4 specifies the complete set of services. The services needed for the purpose of DataAccess are:

  • The View service set and Query service set to detect DataItems, and their Properties.
  • The Attribute service set to read or write Attributes and in particular the value Attribute.
  • The MonitoredItem and Subscription service set to set up monitoring of DataItems and to receive data change notifications.

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