Stateflow

Action Language

This section introduces you to language included in state and transition labels that executes with the execution of the state or transition. See the following topics:

• What Is Action Language? -- Describes action language and provides a general example of its use.
• Action Language Categories Example -- Gives you an overview of the different categories of action language through an example Stateflow diagram.
• Action Language Notation -- Describes action language by referring to topics that define the labels of states and transitions in Stateflow.
• Action Language Semantics -- Describes the interaction of different categories of action language on a state or transition.

What Is Action Language?

Action language defines the categories of actions you can specify using the notation of state and transition labels described in the following topics:

Stateflow attaches actions to a state or transition through its label. The actions for states and transitions are divided into different types of action using label notation. Transitions have event triggers, conditions, condition actions, and transition actions. States can have entry, during, exit, and, on event_name actions.

Action Language Categories Example

The following diagram shows examples of the different categories of actions for states and transitions:

The actions in action language can be broadcast events, condition statements, function calls, variable assignments and operations, etc. Many are very similar to statements in C or MATLAB. See Action Language, for a description of allowable actions in the action language of Stateflow.

Action Language Notation

Action language for states and transitions is included in the label for state or transition to which the action language applies. See the following topics for detailed information on action language notation:

• State Label Notation -- Describes action language for states, which is included in the label for a state
• Transition Label Notation -- Describes action language for transitions which is included in the label of a transition.

Action Language Semantics

The rules for interaction between the different Stateflow notations are referred to as Stateflow semantics. See Stateflow Semantics, for a more detailed understanding of Stateflow semantics (behavior).

For the semantics of state action language, see the following topics:

• Executing a State -- Describes the execution of states that includes state action language.
• State Execution Example -- Gives an example of state execution that includes state action language in generalized format.

For the semantics of transition action language, see the following topics:

• Executing a Transition -- Describes the execution of transitions that include transition action language.
• Label Format for a State-to-State Transition Example -- Gives an example of transition execution that includes transition action language in generalized format.
• Label Format for Transition Segments Example -- Gives an example of transition execution through transition segments to junctions that includes transition action language in generalized format.

Graphical Functions

Stateflow Semantics