Defining Output Events :: Defining Events and Data (Stateflow User's Guide)

Stateflow User's Guide

Defining Output Events

An output event is an event that occurs in a specific chart and is visible in specific Simulink blocks outside the chart. This type of event allows a chart to notify other blocks in a model of events that occur in the chart. To define an event as an output event, set its Scope property to Output to Simulink. You can define multiple output events for a given chart. Stateflow creates a chart output port for each output event that you define (see Port). Your model can use the output ports to trigger the output events in other Simulink blocks in the same model.

The following steps describe how to add and define the necessary fields for an event output to Simulink:

Add an event to the Stateflow chart.

You must add the event to the chart and not to any other object in the chart. Adding events with the Stateflow diagram editor adds them only to the chart open in the diagram editor. In the Model Explorer, you must select the chart object in the left Model Hierarchy pane before adding the event. See Adding Events for a complete description of both ways to add an event.

Set the Scope field to Output to Simulink.

When you define an event to be Output to Simulink, a Simulink output port is added to the Stateflow block. Output events from the Stateflow block to the Simulink model are scalar.

If you want this chart to call a subsystem, do one of the following:

To call an edge-triggered subsystem, set the Trigger property of the output event to Either Edge.

See Defining Edge-Triggered Output Events for an example of a Stateflow block calling an edge-triggered subsystem in Simulink.

To call a function-call subsystem, set the Trigger property of the output event to Function Call.

Function-call triggers call function-call subsystems the moment the call is made, even if it is made in the middle of a time step. For an example of a Stateflow block calling a function-call subsystem, see Defining Function Call Output Events.

If you choose to add an event in the Model Explorer, you can change its Name, Scope, Trigger and Port properties directly in the Model Explorer. See Setting Properties for Stateflow Objects in the Model Explorer for a description.

Associating Input Events with Control Signals Associating an Output Event with an Output Port