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Schedule Subsystems to Execute at Specific Times

The temporal logic scheduler design pattern allows you to schedule Simulink® subsystems to execute at specified times. The model sf_temporal_logic_scheduler illustrates this design pattern.

The Temporal Logic Scheduler chart contains the following logic:

Key Behaviors of Temporal Logic Scheduler

The Temporal Logic Scheduler chart contains two states that schedule the execution of the function-call subsystems A1, A2, and A3 at different rates, as determined by the temporal logic operator every (see Operators for Event-Based Temporal Logic).

In the FastScheduler state, the every operator schedules function calls as follows:

  • Sends A1 every time the function-call output event call wakes up the chart

  • Sends A2 at half the base rate

  • Sends A3 at one-quarter the base rate

The SlowScheduler state schedules function calls less frequently — at 8, 16, and 32 times slower than the base rate. The chart switches between fast and slow executions after every 100 invocations of the call event.

Run the Temporal Logic Scheduler

To run the sf_temporal_logic_scheduler model, follow these steps:

  1. Open the model by clicking sf_temporal_logic_schedulersf_temporal_logic_scheduler or typing sf_temporal_logic_scheduler at the MATLAB® command prompt.

  2. Open the Scope block.

  3. Start simulation.

  4. After the simulation ends, click the Autoscale button in the Scope block.

    The scope illustrates the different rates of execution.

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