Port de distribution
Anschluss / Port

A distribution port is an inlet or outlet of a product through which a particular substance may flow.

Distribution ports are used for passage of solid, liquid, or gas substances, as well as electricity for power or communications. Flow segments (pipes, ducts, cables) may be used to connect ports across products. Distribution ports are defined by system type and flow direction such that for two ports to be connected, they must share the same system type and have opposite flow directions (one side being a SOURCE and the other being a SINK). Ports are similar to openings in that they do not have any visible geometry; such geometry is captured at the shape representation of the enclosing element or element type. Ports may have placement that indicates the position and orientation of the connection.

HISTORY  New entity in IFC2x2
IFC4 CHANGE  Ports are now related to products and product types using the IfcRelNests relationship; use of IfcRelConnectsPortToElement is now reserved for dynamically attached ports (such as drilling a hole in a tank).

Common Use Definitions

The following concepts are inherited at supertypes:

 Instance diagram

Property Sets for Objects

The Property Sets for Objects concept applies to this entity as shown in Table 219.

Table 219 — IfcDistributionPort Property Sets for Objects

Port Nesting

The Port Nesting concept applies to this entity.

Distribution ports are indicated on products and product types using the IfcRelNests relationship where RelatingObject refers to the enclosing IfcDistributionElement or IfcDistributionElementType respectively. The order of ports indicates logical ordering such within outlets, junction boxes, or communications equipment.

Ports may be further nested into sub-ports, for indicating specific connections on components or pins.

Product Assignment

The Product Assignment concept applies to this entity as shown in Table 220.
IfcDistributionSystemIndicates a system that is hosted by the port, as the origination.
IfcDistributionCircuitIndicates a circuit that is switched by the port, as the origination.

Table 220 — IfcDistributionPort Product Assignment

The IfcDistributionPort may be assigned to the following entities using relationships as indicated:

Port Connectivity

The Port Connectivity concept applies to this entity.

IfcDistributionPort may be connected to other objects as follows using the indicated relationship:

Figure 236 illustrates distribution port connectivity.

Connection Use Definition

Figure 236 — Distribution port connectivity

Product Placement

The Product Placement concept applies to this entity.

The placement of a port indicates the position and orientation of how it may connect to a compatible port on another product. The placement shall be relative to the nesting IfcDistributionElement, IfcDistributionElementType, or enclosing IfcDistributionPort.

The Location is the midpoint of the physical connection, unless otherwise indicated by cardinal point on a material profile.

The Axis points in the direction of the physical connection away from the product if FlowDirection equals SOURCE (or SOURCEANDSINK or NOTDEFINED), or points opposite direction (to the product) if the FlowDirection equals SINK.

NOTE  The rationale for positioning the Axis in the direction of flow is to allow for the same geometry to be used, such as for connectors with polarized cross-section.

The RefDirection points in the direction of the local X axis of the material profile, where the local Y axis points up if looking towards the Axis where the local X axis points right.

Upon connecting elements through ports with rigid connections, each object shall be aligned such that the effective Location, Axis, and RefDirection of each port is aligned to be equal (with exception for circular profiles where the RefDirection need not be equal).

XSD Specification:

 <xs:element name="IfcDistributionPort" type="ifc:IfcDistributionPort" substitutionGroup="ifc:IfcPort" nillable="true"/>
 <xs:complexType name="IfcDistributionPort">
   <xs:extension base="ifc:IfcPort">
    <xs:attribute name="FlowDirection" type="ifc:IfcFlowDirectionEnum" use="optional"/>
    <xs:attribute name="PredefinedType" type="ifc:IfcDistributionPortTypeEnum" use="optional"/>
    <xs:attribute name="SystemType" type="ifc:IfcDistributionSystemEnum" use="optional"/>

EXPRESS Specification:

ENTITY IfcDistributionPort
FlowDirection : OPTIONAL IfcFlowDirectionEnum;
PredefinedType : OPTIONAL IfcDistributionPortTypeEnum;
SystemType : OPTIONAL IfcDistributionSystemEnum;

Link to EXPRESS-G diagram EXPRESS-G diagram

Attribute Definitions:

FlowDirection : Enumeration that identifies if this port is a Sink (inlet), a Source (outlet) or both a SinkAndSource.
SystemType : Enumeration that identifies the system type. If a system type is defined, the port may only be connected to other ports having the same system type.

Inheritance Graph:

ENTITY IfcDistributionPort
GlobalId : IfcGloballyUniqueId;
OwnerHistory : OPTIONAL IfcOwnerHistory;
Name : OPTIONAL IfcLabel;
Description : OPTIONAL IfcText;
ENTITY IfcObjectDefinition
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;
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;
ReferencedBy : SET OF IfcRelAssignsToProduct FOR RelatingProduct;
ContainedIn : SET [0:1] OF IfcRelConnectsPortToElement FOR RelatingPort;
ConnectedFrom : SET [0:1] OF IfcRelConnectsPorts FOR RelatedPort;
ConnectedTo : SET [0:1] OF IfcRelConnectsPorts FOR RelatingPort;
ENTITY IfcDistributionPort
FlowDirection : OPTIONAL IfcFlowDirectionEnum;
PredefinedType : OPTIONAL IfcDistributionPortTypeEnum;
SystemType : OPTIONAL IfcDistributionSystemEnum;


Link to this page  Link to this page