View source for DirectLink

[[Category:Models]]
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== General Description ==

The '''DirectLink''' model is automatically created. Most DirectLinks are a direct link I/O (input/output) between two models in special cases. E.g. between a model that has a [[Makeup Block (MU)]] configured and the [[Makeup Source]]. Similar to a [[Flange]], a DirectLink represents a connection between two models and it is used to transfer material between them. Some types of DirectLinks are entry or exit points and represent flow into or out of the project flowsheet. There are no user configurable options in the DirectLink model that affect its behaviour. 

A DirectLink between units is conceptually similar to a simplified [[Pipe]] in that its flow (Qo) is reported in the same way, it has a graphics symbol, no changes in behaviour through the link and included in overall stream reports along with pipes. 

The graphics symbol for a DirectLink (with UnitGroup Stream) is not drawn by the user, but created automatically at the relevant unit when applicable (e.g. when a Makeup Source is connected, or when a tank spills in Dynamic). The graphics symbol cannot be deleted, but can be repositioned and changed in the same way as other graphics symbols using the [[Edit Graphics Commands#Change Symbol|Change Symbol]] command. The graphics symbol can also be replaced by a pipe symbol using the [[Edit Graphics Commands#Redraw Link|Redraw Link]] command.

Some types of DirectLinks are entry or exit points of material from the flowsheet (i.e. inlet or outlet for the project). They have models connected on one side only. Examples include feeder inlets, sink outlets, spills, RB Source/Sink, etc. These DirectLinks do not have graphics symbols.

== DirectLink Types ==

The list of possible DirectLink types (SubClass) are shown in the following table:
{| border="1" cellpadding="5" cellspacing="0" 
|-
|'''SubClass'''||'''UnitGroup'''||'''Source Unit'''||'''Destination Unit'''||'''Description'''
|-
||Makeup||Stream||[[Makeup Source]]||Any with [[Makeup Block (MU)]]||Link between a makeup source and unit/pipe model with Makeups enabled.
|-
||Discard||Stream||Any with [[Discard Block (DB)]]||[[Discard Sink]]||Link between a unit/pipe model with Discards enabled and a discard sink.
|-
||SrcSnk||Stream||[[Makeup Source]]||[[Feeder-Cross Page Connector]]||Link between a makeup source and a Feeder configured with "Link to MakeupSrc" selected for Operation.
|-
||Spill||Stream||Any that can spill||None||Dynamic mode only. Outlet (flowsheet material exit) from a unit/pipe model that "spills".
|-
||Vent||Stream||Any that can vent||None||Dynamic mode only. Outlet (flowsheet material exit) from a unit/pipe model that automatically "vents" (i.e. vapour spill).
|-
||Source||Other||None||[[Feeder-Cross Page Connector|Feeder (as Feeder)]] or<br>[[Makeup Source]]<br>[[Reaction_Block_-_Other#Reaction_Source|RB Source]]||Inlet (flowsheet material entry). For example to a feeder (configured as material source), to a makeup source or to a RB configured with a Reaction Source.
|-
||Sink||Other||[[Feeder-Cross Page Connector|Feeder (as Sink)]] or<br>[[Discard Sink]] or<br>[[Reaction_Block_-_Other#Reaction_Sink|RB Sink]]||None||Outlet (flowsheet material exit). For example from a feeder (configured as material sink) or from a RB configured with a Reaction Sink.
|}

== Data Sections ==

The default sections and variable names are described in the following table.  The number of Tabs in the access window may increase or decrease, based on user configuration.

# '''DirectLink''' - The first section, contains general information relating to material flowing through the Direct Link.
# '''[[Material Flow Section|Qo]]''' - This and subsequent tabs show the properties of the Direct Link.  This tab is always visible.
# '''Sp''' - This tab shows the composition of material flowing through the Direct Link.
# The '''[[Direct Link Info Page|Info]]''' section contains general settings for the unit and allows the user to include documentation about the unit.

=== DirectLink Tab Page ===

'''Unit Type: DirectLink''' - The first tab page in the access window will have this name.

{| border="1" cellpadding="5" cellspacing="0" 
|-
|'''Tag (Long/Short)'''||'''Input / Calc'''||'''Description/Calculated Variables / Options'''
{{Common Data on First Tab Page}}
|-
||SubClass||font style="background: #ebebeb" |Display||This will display the type of Direct Link, i.e. Makeup, Discard, SrcSnk, Source, Sink, Spill, Vent.
|-
| colspan=3 style="background: #ebebeb" |Connections
|-
||SourceTag / SrcTag|| font style="background: #ebebeb"  |Display||The tag of the source unit. Blank if SubClass is ''Source''.  For example for SubClass ''Makeup'' it will come from a [[Makeup Source]]. 
|-
||DestinationTag / DstTag|| font style="background: #ebebeb"  |Display||The tag of the destination unit. Blank if SubClass is ''Sink'', ''Spill'' or ''Vent''.  For example for SubClass ''Discard'' it will be going to a [[Discard Sink]].
|-
| SourceLink / SrcIO ||  font style="background: #ebebeb"  | Display || {{Available139|33098}} The tag of the DirectLink's source unit, including the I/O connection point (PortID) of that unit. Blank if SubClass is ''Source''.
|-
| DestinationLink / DstIO || font style="background: #ebebeb" | Display || {{Available139|33098}} The tag of DirectLink's destination unit, including the I/O connection point (PortID) of that unit. Blank if SubClass is ''Sink'', ''Spill'' or ''Vent''.
|-
| SourceUitType / SrcUnitType || font style="background: #ebebeb"  |Display || {{Available139|33098}} The UnitType of the source unit.  
|-
| DestinationUitType / DstUnitType || font style="background: #ebebeb"  |Display || {{Available139|33098}} The UnitType of the destination unit.
|}

=== Qo Tab Page ===

{{ Qo Data Section | UnitOp=DirectLink }}