Beginners Guide to Model-Based Systems Engineering

12/18/2018

A Minor Detour: State Transition Diagrams • Describe the logical transition of the system through multiple states • Orthogonal to behavior • Alternative approach to analysis / representation • If both are used, states are elaborated / realized by behavior • Represents states, transitions that connect them, and events that trigger transitions • Traditional systems approach included in SysML specification

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Key Semantics of State Transition Diagrams

• States

• Shown as rounded rectangles • Indicate state name plus

• entry – functions invoked when state entered • exit – functions invoked when state left • do – functions executed while in the state

• Transitions

• Lines connecting states • Reflect valid transition paths

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