By turning on active state output, the state activity is made available through an output data port to Simulink®. This data signal can be:
Viewed using a scope.
Logged for diagnostics.
Used to drive another subsystem.
Using active state output can simplify the design in some Stateflow® charts. You do not have to explicitly update data used to track state activity. For an example, see Use Active State Output.
For more information about logging the chart or state activity data in Simulink, see Signal Logging.