It shouldn't matter if you examine the Alarm Triggers at bit level or as word value.
What you need to do though is to assign an Acknowledge connection to the application's Alarm Setup/Triggers tab. If you do not have a configured Ack connection any active alarms will not be added to the Log file when they clear hence there will not be any records to be retrieved by the Alarm History; see FTVME User Manual Pg. 153.