7.2.3.3 IfcAlarm

Alarme
Alarm / Gefahrenmelder

An alarm is a device that signals the existence of a condition or situation that is outside the boundaries of normal expectation or that activates such a device.

Alarms include the provision of break glass buttons and manual pull boxes that are used to activate alarms.

HISTORY  New entity in IFC4

Common Use Definitions

The following concepts are inherited at supertypes:

 Instance diagram

Object Typing

The Object Typing concept applies to this entity as shown in Table 261.
Type
IfcAlarmType
IfcDistributionControlElementType
IfcDistributionElementType

Table 261 — IfcAlarm Object Typing



Property Sets for Objects

The Property Sets for Objects concept applies to this entity as shown in Table 262.
PredefinedTypeName
 Pset_AlarmPHistory
 Pset_AlarmTypeCommon
 Pset_ElectricalDeviceCommon
 Pset_Condition
 Pset_EnvironmentalImpactIndicators
 Pset_EnvironmentalImpactValues
 Pset_ManufacturerOccurrence
 Pset_ManufacturerTypeInformation
 Pset_PackingInstructions
 Pset_ServiceLife
 Pset_Warranty

Table 262 — IfcAlarm Property Sets for Objects



Quantity Sets

The Quantity Sets concept applies to this entity as shown in Table 263.
Name
Qto_AlarmBaseQuantities

Table 263 — IfcAlarm Quantity Sets



Material Constituents

The Material Constituents concept applies to this entity as shown in Table 264.
NameDescription
CasingMaterial from which the casing is constructed.

Table 264 — IfcAlarm Material Constituents



Port Nesting

The Port Nesting concept applies to this entity as shown in Table 265.
PredefinedTypeNameFlowTypeDescription
 InputSINKSIGNALReceives signal.

Table 265 — IfcAlarm Port Nesting




XSD Specification:

 <xs:element name="IfcAlarm" type="ifc:IfcAlarm" substitutionGroup="ifc:IfcDistributionControlElement" nillable="true"/>
 <xs:complexType name="IfcAlarm">
  <xs:complexContent>
   <xs:extension base="ifc:IfcDistributionControlElement">
    <xs:attribute name="PredefinedType" type="ifc:IfcAlarmTypeEnum" use="optional"/>
   </xs:extension>
  </xs:complexContent>
 </xs:complexType>

EXPRESS Specification:

ENTITY IfcAlarm
SUBTYPE OF IfcDistributionControlElement;
PredefinedType : OPTIONAL IfcAlarmTypeEnum;
WHERE
CorrectPredefinedType : NOT(EXISTS(PredefinedType)) OR (PredefinedType <> IfcAlarmTypeEnum.USERDEFINED) OR ((PredefinedType = IfcAlarmTypeEnum.USERDEFINED) AND EXISTS (SELF\IfcObject.ObjectType));
CorrectTypeAssigned : (SIZEOF(IsTypedBy) = 0) OR ('IFCBUILDINGCONTROLSDOMAIN.IFCALARMTYPE' IN TYPEOF(SELF\IfcObject.IsTypedBy[1].RelatingType));
END_ENTITY;

Link to EXPRESS-G diagram EXPRESS-G diagram

Formal Propositions:

CorrectPredefinedType : Either the PredefinedType attribute is unset (e.g. because an IfcAlarmType is associated), or the inherited attribute ObjectType shall be provided, if the PredefinedType is set to USERDEFINED.
CorrectTypeAssigned : Either there is no alarm type object associated, i.e. the IsTypedBy inverse relationship is not provided, or the associated type object has to be of type IfcAlarmType.

Inheritance Graph:

ENTITY IfcAlarm
ENTITY IfcRoot
GlobalId : IfcGloballyUniqueId;
OwnerHistory : OPTIONAL IfcOwnerHistory;
Name : OPTIONAL IfcLabel;
Description : OPTIONAL IfcText;
ENTITY IfcObjectDefinition
INVERSE
HasAssignments : SET OF IfcRelAssigns FOR RelatedObjects;
Nests : SET [0:1] OF IfcRelNests FOR RelatedObjects;
IsNestedBy : SET OF IfcRelNests FOR RelatingObject;
HasContext : SET [0:1] OF IfcRelDeclares FOR RelatedDefinitions;
IsDecomposedBy : SET OF IfcRelAggregates FOR RelatingObject;
Decomposes : SET [0:1] OF IfcRelAggregates FOR RelatedObjects;
HasAssociations : SET OF IfcRelAssociates FOR RelatedObjects;
ENTITY IfcObject
ObjectType : OPTIONAL IfcLabel;
INVERSE
IsDeclaredBy : SET [0:1] OF IfcRelDefinesByObject FOR RelatedObjects;
Declares : SET OF IfcRelDefinesByObject FOR RelatingObject;
IsTypedBy : SET [0:1] OF IfcRelDefinesByType FOR RelatedObjects;
IsDefinedBy : SET OF IfcRelDefinesByProperties FOR RelatedObjects;
ENTITY IfcProduct
ObjectPlacement : OPTIONAL IfcObjectPlacement;
Representation : OPTIONAL IfcProductRepresentation;
INVERSE
ReferencedBy : SET OF IfcRelAssignsToProduct FOR RelatingProduct;
ENTITY IfcElement
Tag : OPTIONAL IfcIdentifier;
INVERSE
FillsVoids : SET [0:1] OF IfcRelFillsElement FOR RelatedBuildingElement;
ConnectedTo : SET OF IfcRelConnectsElements FOR RelatingElement;
IsInterferedByElements : SET OF IfcRelInterferesElements FOR RelatedElement;
InterferesElements : SET OF IfcRelInterferesElements FOR RelatingElement;
HasProjections : SET OF IfcRelProjectsElement FOR RelatingElement;
ReferencedInStructures : SET OF IfcRelReferencedInSpatialStructure FOR RelatedElements;
HasOpenings : SET OF IfcRelVoidsElement FOR RelatingBuildingElement;
IsConnectionRealization : SET OF IfcRelConnectsWithRealizingElements FOR RealizingElements;
ProvidesBoundaries : SET OF IfcRelSpaceBoundary FOR RelatedBuildingElement;
ConnectedFrom : SET OF IfcRelConnectsElements FOR RelatedElement;
ContainedInStructure : SET [0:1] OF IfcRelContainedInSpatialStructure FOR RelatedElements;
ENTITY IfcDistributionElement
INVERSE
HasPorts : SET OF IfcRelConnectsPortToElement FOR RelatedElement;
ENTITY IfcDistributionControlElement
INVERSE
AssignedToFlowElement : SET [0:1] OF IfcRelFlowControlElements FOR RelatedControlElements;
ENTITY IfcAlarm
PredefinedType : OPTIONAL IfcAlarmTypeEnum;
END_ENTITY;

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