Stated otherwise, Part Properties and Reference Properties in an IBD can have a different usages or roles depending upon how they are realized ("wired") in the IBD. IBD specifies Part Properties and Reference Properties usages or roles in the structural context of the Block that encapsulates them.A BDD defines a Block’s Properties, including its Part Properties (strongly owned Parts) and Reference Properties (shared Parts).white-box) and support recursive structural decomposition techniques during System Analysis & Design. IBD Block Usage DichotomyīDDs and IBDs complement each other (cf. When used correctly BDDs + IBDs are recursively scalable and mathematically (parametrically) simulatable (See Executable Semantics below.) The purpose of Internal Block Diagrams (IBDs) is to show the encapsulated structural contents (Parts, Properties, Connectors, Ports, Interfaces) of Blocks so that they can be recursively decomposed and "wired" using Interface Based Design techniques. compare and contrast: UML 2 Class and Component diagrams SA/SD System Context & Structure Chart diagrams IDEF IDEF1X diagrams.Blocks can be mathematically constrained via Constraint Blocks to produce mathematically simulatable Parametric diagrams.Behaviors can either be encapsulated by Blocks (e.g., Operations, Signals, and State Machines) or Allocated (via «allocate» Dependency) to Blocks (e.g., Activities/Actions) directly or indirectly (via Interfaces).
Blocks can be recursively decomposed ("nested") into Parts by alternating between Block Definition Diagram (BDD) definitions and Internal Block Diagram (IBD) usages (See Usage Notes below.).Stated otherwise, an IBD is a "white-box" perspective of an encapsuated ("black-box") Block. Internal Block Diagram (ibd): An Internal Block Diagram is a static structural diagram owned by a particular Block that shows its encapsulated structural contents: Parts, Properties, Connectors, Ports, and Interfaces. Blocks can be recursively decomposed into Parts, where each Part must also be defined by a Block.Blocks support both Provided (implemented or realized) and Required (used) Interfaces for both information and physical flows.Blocks can specify software, hardware, mechanical, and wetware (persons, organizations, facilities) components.The unique interaction points for attaching and connecting ("wiring") Block Interfaces are called Ports. Behaviors encapsulated by Blocks include: Operations, Signals, and State Machines. What is a SysML Internal Block Diagram? Definitionsīlock: A Block (notation: rectangle with keyword = «block») represents a system component, a modular structural unit that encapsulates its contents ( Properties, Behaviors, Constraints) and supports first-class (i.e., can be drawn and directly manipulated in the model repository) Interfaces.