This property enables updating Tags inside an OPC UA Subscription. If this property is set to False, no Tag inside an OPC UA Subscription is updated. Otherwise, Tags with their AllowRead property set to True and in Advise mode are kept updated according to the update time, defined in the Scan property. For more information, please check the AdviseType property. If this property is set to False, users cannot use OPC UA Driver's RefreshUaNodeIds method.