Discrete-Event Chart Precise Timing
This example shows the precise timing that a Discrete-Event Chart block executes as it generates parts in a facility. The behavior of the Discrete-Event Chart and the Stateflow® blocks are compared. Both blocks require a Stateflow® license. Using a Discrete-Event Chart block, the example shows that the temporal resolution of events can be arbitrarily precise and independent from the model sample time.
In this example, an entity represents a part generated in
pi seconds. The solver is set to
Fixed-step with step size
1, and for the Stateflow® Chart block, the
Enable Super Step Semantics check box is selected. For more information, see Super Step Semantics (Stateflow).
In this model, the Part Generation block is created using a Discrete-Event Chart block and the Part Generation Chart is created using a Stateflow® Chart block. Both blocks contain the same state transition model, including two states,
CreatePartstate represents the production of a
WaitForQAstate represents the wait for the quality control department for
Enable the sample time annotation and simulate the model. Observe that the sample time for the Discrete-Event Chart block reflects the event-based sampling.
Part is generated by the Discrete-Event chart after precisely
3.14 seconds, independent from the simulation step size.
Part is generated by the Stateflow® Chart after
4 seconds. This is due to the fixed step size
1 , which causes the Stateflow® Chart block to wait until the next simulation step.