Select constraints on the sample times defined by this model. If the model does not satisfy the specified constraints during simulation, Simulink® software displays an error message.
Category: Solver
Default:
Unconstrained
UnconstrainedSpecifies no constraints. Selecting this option causes Simulink software to display a field for entering the solver step size.
Use the Fixed-step size (fundamental sample time) option to specify solver step size.
Ensure sample time independentSpecifies that Model blocks inherit sample time from the
context in which they are used. You cannot use a
referenced model that has intrinsic sample times in a
triggered subsystem or iterator subsystem. If you plan on
referencing this model in a triggered or iterator
subsystem, you should select Ensure sample
time independent so that Simulink can detect sample time problems while unit
testing this model.
Simulink software checks to ensure that this model can inherit its sample times from a model that references it without altering its behavior. Models that specify a step size (i.e., a base sample time) cannot satisfy this constraint. For this reason, selecting this option causes Simulink software to hide the group's step size field (see Fixed-step size (fundamental sample time)).
SpecifiedSpecifies that Simulink software check to ensure that this model operates at a specified set of prioritized periodic sample times. Use the Sample time properties option to specify and assign priorities to model sample times.
Execute Multitasking Models (Simulink Coder) explains how to use this option for multitasking models.
During simulation, Simulink software checks to ensure that the model satisfies the constraints. If the model does not satisfy the specified constraint, then Simulink software displays an error message.
This parameter is enabled only if the solver Type is set to
Fixed-step.
Selecting Unconstrained enables the following parameters:
Fixed-step size (fundamental sample time)
Treat each discrete rate as a separate task
Higher priority value indicates higher task priority
Automatically handle rate transitions for data transfers
Selecting Specified enables the following
parameters:
Sample time properties
Treat each discrete rate as a separate task
Higher priority value indicates higher task priority
Automatically handle rate transitions for data transfers
Parameter:
SampleTimeConstraint |
Value:
'unconstrained' |
'STIndependent' |
'Specified' |
Default:
'unconstrained' |
| Application | Setting |
|---|---|
| Debugging | Update optimize using the specified minimum and maximum values to Off |
| Traceability | No impact |
| Efficiency | No impact |
| Safety precaution | No impact |