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For the sake of simplicity,
251
SysML offers a conjugated fl ow port that is denoted inversely to the normal fl ow
port ( Figure 4.39 ).
Another variant is the atomic fl ow port. It allows only one data type to pass it
in one direction. In this case, no fl ow specifi cation is required. The data type that
can be transported is directly the type of the port. The direction is denoted by an
arrow in the port rectangle ( Figure 4.40 ).
4.5 Block Diagrams
FIGURE 4-38
A fl ow port in the block defi nition diagram.
bdd [package] Engine [flow port]
Engine
fp:FS_Engine
FIGURE 4-39
Example for conjugated fl ow ports.
ibd [block] Drive system [CAN]
e:Engine
ctrl:Control
ctrl:FS_Engine
Engine:FS_Engine
FIGURE 4-40
Example for atomic fl ow ports.
ibd [block] On-board computer [power supply card]
:Card reader :Customer card
e:Energy
e:Energy
252 CHAPTER 4 SysML??”The Systems Modeling Language
4.5.6 Item Flow
Defi nition
An item flow is a special information flow that describes at a connector in the
internal block diagram that specific objects are transported.


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