IfcFlowDirectionEnum

BACnet MVD

#### IfcFlowDirectionEnum

Natural language names

| Flow Direction Enum
| Enumération des types de contrôleur de débit

##### Semantic definitions at the type

Type definition

This enumeration defines the flow direction at a distribution port.

- For pipe-based ports, the direction is the physical flow direction.
- For duct-based ports, the direction is the physical flow direction.
li>For cable-based ports carrying electric power (circuits containing hot, neutral, ground), the direction is from the origination of power (from a distribution board to protective devices to switches to fixtures). For cable-based ports carrying communication signals, the direction originates from where the signal is shaped, such as a sensor. For communicaton networks, the direction originates from the up-level network host, such as a router (having SOURCE ports) hosting multiple computers (having SINK ports).

> HISTORY New enumeration in IFC2.0.

Enumeration definition

Constant | Description
--- | ---
SOURCE | A flow source, where a substance flows out of the connection.
SINK | A flow sink, where a substance flows into the connection.
SOURCEANDSINK | Both a source and sink, where a substance flows both into and out of the connection simultaneously.
NOTDEFINED | Undefined flow direction.

##### Formal representations

XML Specification
`<xs:simpleType name="IfcFlowDirectionEnum">
<xs:restriction base="xs:string">
<xs:enumeration value="source"/>
<xs:enumeration value="sink"/>
<xs:enumeration value="sourceandsink"/>
<xs:enumeration value="notdefined"/>
</xs:restriction>
</xs:simpleType>
`
EXPRESS Specification
`TYPE IfcFlowDirectionEnum = ENUMERATION OF (
SOURCE,
SINK,
SOURCEANDSINK,
NOTDEFINED);
END_TYPE;

EXPRESS-G diagram

`

References: IfcDistributionPort

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