A Practical Guide to SysML: The Systems Modeling Language
Sanford Friedenthal, Alan Moore
Format: PDF / Kindle (mobi) / ePub
Systems engineers must understand how all the parts of a digital system work together, including hardware AND software. SysML is the first design language to cover both hardware and software, allowing engineers to consider how all the parts of a system will successfully interact, from the very beginning of a project. This can prevent huge problems and delays down the line. Therefore, SysML use is becoming a widespread phenomenon, and many companies, especially in the defense, automotive, aerospace, medical device and telecommunications industries, are already using SysML, or are planning to switch over in the near future.
Until now, little consolidated information has been available on the market regarding SysML. However, this book changes all that! It provides the hundreds of thousands of new users with a comprehensive guide to SysML, including a full description of the language itself, detailed instructions on how to implement it, exercises to help readers gain practical experience working with SysML, and extensive, real-world examples of actual successful projects, demonstrating all the benefits SysML can provide.
*The authoritative guide for understanding and applying SysML
*Authored by the foremost experts on the language
*Language description, examples, and quick reference guide included
structural model. A typical example is a logical-physical allocation, where a logical block hierarchy is often built and maintained at an abstract level, and in turn is mapped to another physical block hierarchy at a more concrete level. Software-hardware allocation is another example of structural allocation. In SysML, allocation is often used to allocate abstract software elements to hardware elements. UML uses the concept of deployment to Section 12.10 u ----- .. 'O -~·· ,,~.~~.- ..
«rnetaclass» Generalization «enumeration» AggregationKind none shared composite «metaclass» Operation «rnetaclass» Class class 0..1 class 0..1 ownedOperation isQuery : Boolean 0." «metaclass» Property ownedAttribute 0." aggregation: AggregationKind FIGURE 14.3 Fragment of UML4SysML, the underlying metamodel for SysML. the metamodel. Some of these model elements just capture details of the model's internal structure, such as how the model elements are organized into packages (the
Interface symbols with the same name and different shapes. Figure 6.34 displays an Internal block diagram for Surveillance System showIng two of its parts, the Ul and the Monitoring Station. The ports of these two parts are connected both to the ports on their parent and to each other's ports. Surveillance System delegates the handiIng of requests on its user login port to the Ul, and the handling of requests on its camera cmds port to the Monitoring Station. The Ul uses Login Support services of
to be an activity in this chapter, although it can be other types of SysML behavior. A call behavior action has a pin for each parameter of the called behavior and the characteristics of those pins must match the multiplicity and type of their corresponding parameters on the invoked behavior. If an activity parameter on the invoked activity is streaming, then the corresponding pin on the call behavior action has streaming semantics. As stated earlier, tokens on normal or nonstreaming pins, such
be handled independently and concurrently. Note that the tokens merely represent the items flowing, and the replication of tokens does not imply that the represented items are replicated. In particular, if the represented item is physical, replication of that physical object may not even be possible. • A join node has one output flow and more than one input flow-its default behavior for object flows is to produce output tokens only when an input token is available on each input flow. Once this