Describe Sequence Diagrams

Author interactions between components in sequence of message exchanges to simulate and verify system design

Define sequence diagrams to iteratively verify your design with system behaviors. Use sequence diagrams integrated with System Composer™ to describe system behaviors as the interaction between components in a sequence of message exchanges. Sequence diagrams use signal-based and Simulink^® message-based communication.

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`	Lifeline 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.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 a message to the interaction between lifelines (Since R2024b)
`addOperand`	Add operand to fragment (Since R2024b)
`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 an 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 (Since R2020b)

Topics

Describe System Behavior Using Sequence Diagrams
Learn about and interact with sequence diagrams in System Composer.
Author Sequence Diagrams Interactively
Create lifelines, messages, fragments, and operands for a sequence diagram.
Author Sequence Diagram Fragments
Use combined fragments in sequence diagrams to change default message activation and ordering.
Author Sequence Diagrams to Co-Create Architecture Models
Implement sequence diagrams using the Architecture Views Gallery.
Synchronize Sequence Diagrams and Architecture Models
Synchronize changes between sequence diagrams and architecture models.
Simulate Sequence Diagrams for Traffic Light Example
Simulate sequence diagrams in System Composer.
Author and Simulate Basic Colors Sequence Diagram with Enumerations
Learn to use enumerations with sequence diagrams.

Featured Examples

Pivot Between Lifelines and Components in Views Gallery

Pivot between components and lifelines in Views Gallery.

Open Live Script

Validate Requirements for Machine Cooling System Architecture

Validate requirements using a machine cooling example.

Open Live Script