Stateflow Hierarchy of Objects
Stateflow machines arrange Stateflow objects in a
hierarchy based on containment. That is, one Stateflow object
can contain other Stateflow objects.
The highest object in Stateflow hierarchy is the Stateflow machine.
It is an object that contains all other Stateflow objects in
a Simulink model. The Stateflow machine contains all the Stateflow charts
in a Simulink model. In addition, the Stateflow machine
for a model can contain its own data and target objects.
Similarly, charts can contain state, box, function, data, event,
transition, junction, and note events. You use all these objects to
create a Stateflow chart. Continuing with the Stateflow hierarchy,
states can contain all these objects as well, including other states.
You can represent state hierarchy with superstates and substates.
For example, this chart has a superstate that contains two substates.
In the preceding chart, the engaged superstate
contains the first and second substates.
The engaged superstate is the parent in the hierarchy
to the states first and second.
When the event clutch_engaged occurs, the system
transitions out of the neutral state to the engaged superstate.
Transitions within the engaged superstate are intentionally
missing from this example for simplicity.
A transition out of a superstate implies transitions out of
any of its active substates. Transitions can cross superstate boundaries
to specify a substate destination. If a substate becomes active, its
parent superstate also becomes active.
You can organize complex charts by defining a containment structure.
A hierarchical design usually reduces the number of transitions and
produces neat, manageable charts. To manage graphical objects, use
the Stateflow Editor. To manage nongraphical objects, use the
Model Explorer or the Stateflow Editor.
 | Stateflow Chart Objects | | Bibliography |  |
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