HL DB

High Low Alarm Deadband.  Applies to High-High, High, Low and Low-Low Alarms. A deadband is used to minimize nuisance alarms or repeating alarms caused by an oscillation near the Alarm Limit.  The deadband comes into effect only after the alarm limit is violated.  The deadband specifies the change in the tag's value required to be considered a return to normal or not in alarm.  The deadband can be in either engineering units (absolute value) or percentage of span.

Range:              -99,999,999,999 to 99,999,999,999
Units:                % or Absolute Value - depends on HL DB Percentage setting
Field Type:        Analog
Tag fields:         .ALMDBP         - in percent of span
                        .ALMDBV         - in absolute value