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• OPC-10000-81 – OPC Unified Architecture - Part 81: UAFX Connecting Devices and Information Model
  6.5.2 ControlGroupType definition
  establish control ( EstablishControlCmd ) and reassign control ( ReassignControlCmd ). The CloseConnections Method will release any Locks that may have been acquired as part of connection establishment. The functionality provided by EstablishConnections ( ReassignControlCmd ... that provided by the individual Methods in the ControlGroup , except they operate on the Locks as the lock-owner. If a ControlGroup is assigned to a ConnectionEndpoint , only those having
• OPC-10000-81 – OPC Unified Architecture - Part 81: UAFX Connecting Devices and Information Model
  6.5.3 EstablishControl method
  EstablishControl method This Method shall acquire Locks required by the ControlGroup in the ListToRestrict and ListToBlock . If acquiring any Lock fails, all Locks shall be released, and the appropriate LockStatus ... shall be returned. If all required Locks can be acquired, the Method shall set the IsControlled flag and create the Controls Reference . It is recommended that this Method be restricted
• OPC-10000-81 – OPC Unified Architecture - Part 81: UAFX Connecting Devices and Information Model
  6.5.5 ReassignControl method
  ReassignControl method This Method shall reassign Locks required by the ControlGroup in the ListToRestrict and ListToBlock . It shall reassign the SourceNode of the Controls Reference
• OPC-10000-81 – OPC Unified Architecture - Part 81: UAFX Connecting Devices and Information Model
  6.5.6 ControlItemFolderType
  provides the basic locking functionality. As described in OPC 10000-100 , Locks will timeout after a MaxInactiveLockTime period unless there is activity as defined or unless the RenewLock Method