This property is used to control the generation of the OnTagRead event, which occurs in the OPC UA Driver that contains this OPC UA Block Tag. If this property is set to True, at each reading from an OPC UA Server, whether in error or not, the OnTagRead event in the OPC UA Driver that contains this OPC UA Block Tag is generated. Otherwise, this event does not occur. Also when this property is set to True, at each reading sent to an OPC UA Server the OnTagWrite event is generated in the OPC UA Driver that contains this OPC UA Block Tag. If the writing is asynchronous, the OnTagWrite event is generated only when the OPC UA Server sends a response indicating whether that writing was successful or not. In this case, the event is generated only if this property is set to True at that time, and not at the time the writing was sent. Default value of this property is False.