#### 7.1.4.8 Pset_AlarmPHistory

PSET_PERFORMANCEDRIVEN / IfcAlarm

| Properties for history of alarm values. HISTORY: Added in IFC4.

buildingSMART Data Dictionary

PSD-XML

- Enabled
  P_REFERENCEVALUE / IfcTimeSeries / IfcBoolean

  | Enabled: Indicates whether alarm is enabled or disabled over time.

- Condition
  P_REFERENCEVALUE / IfcTimeSeries / IfcIdentifier

  | Condition: Indicates alarm condition over time. The range of possible values and their meanings is defined by Pset_AlarmTypeCommon.Condition. An empty value indicates no present alarm condition.

- Severity
  P_REFERENCEVALUE / IfcTimeSeries / IfcInteger

  | Severity: Indicates alarm severity over time, where the scale of values is determined by the control system configuration. A zero value indicates no present alarm.

- Acknowledge
  P_REFERENCEVALUE / IfcTimeSeries / IfcLogical

  | Acknowledge: Indicates acknowledgement status where False indicates acknowlegement is required and outstanding, True indicates condition has been acknowedged, and Unknown indicates no acknowledgement is required. Upon resetting the condition, then acknowledgement reverts to Unknown.

- User
  P_REFERENCEVALUE / IfcTimeSeries / IfcIdentifier

  | User: Indicates acknowledging user over time by identification corresponding to IfcPerson.Identification on an IfcActor.

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