IfcActuator

IfcActuator

Definition from IAI: This class defines properties of an actuating device typically used in a control system such as a building automation control system.

HISTORY: New entity in IFC R2.0
ISSUES: See issues and change log for changes made in IFC R2x.

Geometry Use Definitions

The geometric representation of IfcActuator is given by the IfcProductDefinitionShape, allowing multiple geometric representations. Included are:

Local Placement

The use of local placement is defined at the supertype IfcControlElement.

Standard Geometric Representation

Currently, the use of attribute driven geometry for this class is not supported. The standard geometric representation is defined using explicit geometry.

B-Rep Representation

The faceted B-Rep capabilities (with or without voids) shall be supported for B-Rep representation.

EXPRESS specification:

ENTITY IfcActuator

SUBTYPE OF (

IfcControlElement);

PredefinedType

IfcActuatorTypeEnum;

FailPosition

OPTIONAL IfcActuatorFailPositionEnum;

WHERE

WR1

(PredefinedType <> IfcActuatorTypeEnum.USERDEFINED) OR ((PredefinedType = IfcActuatorTypeEnum.USERDEFINED) AND EXISTS(SELF\IfcObject.ObjectType));

END_ENTITY;

Attribute definitions:

PredefinedType	:	Predefined generic types of actuators are specified in an enumeration. There may be a property set given for the predefined types.
FailPosition	:	Enumeration defining the types of fail positions for the actuator.

Formal Propositions:

WR1

References (1):

Name

Type

Referred through

Express-G

IfcControlElement

Entity

Subtype

Diagram 2

Inheritance graph

ENTITY IfcActuator;

ENTITY IfcRoot;

GlobalId

IfcGloballyUniqueId;

OwnerHistory

IfcOwnerHistory;

Name

OPTIONAL IfcLabel;

Description

OPTIONAL IfcText;

ENTITY IfcObject;

ObjectType

OPTIONAL IfcLabel;

INVERSE

IsDefinedBy

SET OF IfcRelDefines FOR RelatedObjects;

HasAssociations

SET OF IfcRelAssociates FOR RelatedObjects;

HasAssignments

SET OF IfcRelAssigns FOR RelatedObjects;

Decomposes

SET OF IfcRelDecomposes FOR RelatedObjects;

IsDecomposedBy

SET [0:1] OF IfcRelDecomposes FOR RelatingObject;

ENTITY IfcProduct;

ObjectPlacement

OPTIONAL IfcObjectPlacement;

Representation

OPTIONAL IfcProductRepresentation;

INVERSE

ReferencedBy

SET OF IfcRelAssignsToProduct FOR RelatingProduct;

ENTITY IfcElement;

Tag

OPTIONAL IfcIdentifier;

INVERSE

ConnectedTo

SET OF IfcRelConnectsElements FOR RelatingElement;

ConnectedFrom

SET OF IfcRelConnectsElements FOR RelatedElement;

ContainedInStructure

SET [0:1] OF IfcRelContainedInSpatialStructure FOR RelatedElements;

ENTITY IfcDistributionElement;

ENTITY IfcControlElement;

ControlElementId

IfcLabel;

INVERSE

AssignedToFlowElement

SET [0:1] OF IfcRelFlowControlElements FOR RelatedControlElements;

ENTITY IfcActuator;

PredefinedType

IfcActuatorTypeEnum;

FailPosition

OPTIONAL IfcActuatorFailPositionEnum;

END_ENTITY;