Describe Sequence Diagrams

R2026b

Specify interactions between components as sequence of message exchanges to simulate and verify system design

Author sequence diagrams to iteratively simulate and verify your architecture model behaviors. Use sequence diagrams in System Composer™ to describe interactions between components as a sequence of message exchanges. Specify communication between components with signal-based and Simulink^® message-based communication. You can also apply fill colors and formatting to diagram elements for visual clarity.

Classes

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Sequence Diagrams

`systemcomposer.interaction.Interaction`	Interaction (Since R2024a)
`systemcomposer.interaction.Iterator`	Iterator utility to navigate interactions (Since R2024a)
`systemcomposer.interaction.Lifeline`	Lifeline in interaction (Since R2024a)
`systemcomposer.interaction.MessageEvent`	Message end in interaction (Since R2024a)
`systemcomposer.interaction.FormalGate`	Formal gate in interaction (Since R2024a)
`systemcomposer.interaction.Message`	Message between lifelines in interaction (Since R2024a)
`systemcomposer.interaction.Fragment`	Fragment in interaction (Since R2024a)
`systemcomposer.interaction.RootFragment`	Root fragment in interaction (Since R2024a)
`systemcomposer.interaction.AltFragment`	Alternative fragment in interaction (Since R2024a)
`systemcomposer.interaction.OptFragment`	Optional fragment in interaction (Since R2024a)
`systemcomposer.interaction.LoopFragment`	Loop fragment in interaction (Since R2024a)
`systemcomposer.interaction.SeqFragment`	Weak sequencing fragment in interaction (Since R2024a)
`systemcomposer.interaction.StrictFragment`	Strict sequencing fragment in interaction (Since R2024a)
`systemcomposer.interaction.ParFragment`	Parallel fragment in interaction (Since R2024a)
`systemcomposer.interaction.Operand`	Operand in fragment in interaction (Since R2024a)
`systemcomposer.interaction.DurationConstraint`	Duration constraint (Since R2025a)
`systemcomposer.interaction.Annotation`	Annotation in interaction (Since R2024a)

Functions

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Sequence Diagrams

`openViews`	Open Architecture Views Gallery
`addInteraction`	Create new sequence diagram in model (Since R2024b)
`getInteraction`	Get interaction in model (Since R2024a)
`getInteractions`	Get all interactions in model (Since R2024a)
`open`	Open interaction (Since R2024a)
`addLifeline`	Create new lifeline in interaction (Since R2024b)
`addFragment`	Add fragment to operand (Since R2024b)
`addMessage`	Add message to interaction between lifelines (Since R2024b)
`addOperand`	Add operand to fragment (Since R2024b)
`addDurationConstraint`	Add duration constraint to interaction (Since R2025a)
`addAnnotation`	Create new annotation in interaction (Since R2024b)
`findLifeline`	Find lifeline in interaction (Since R2024b)
`findElement`	Find element in interaction (Since R2024b)
`move`	Move fragment within interaction (Since R2024b)
`move`	Move lifeline within interaction (Since R2024b)
`move`	Move message within interaction (Since R2024b)
`destroy`	Remove model element
`next`	Return next element in fragment (Since R2024a)
`current`	Return currently visited element of fragment (Since R2024a)
`reset`	Reset iterator (Since R2024a)

Tools

Architecture Views Gallery	Create and manage views and sequence diagrams
Sequence Viewer	Visualize messages, events, states, transitions, and functions

Topics

Describe System Behavior Using Sequence Diagrams
Describe model behaviors through interactions with sequence diagrams in System Composer.
Author Sequence Diagrams Interactively
Create lifelines, messages, fragments, and operands for a sequence diagram.
Format and Edit Sequence Diagram Layout
Apply fill color, arrange layout, edit element positions, and add annotations to sequence diagrams for visual clarity.
Model Complex Interactions Using Fragments in Sequence Diagrams
Use combined fragments in sequence diagrams to change default message activation and ordering.
Author Architecture Models Through Sequence Diagrams
Use sequence diagrams to co-create and synchronize changes with architecture models.