Customize System Objects for Simulink - MATLAB & Simulink (original) (raw)

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Customize System object™ for use in MATLAB System block

The MATLAB System block enables a System object defined in MATLAB® to be used as a block in Simulink®. To control the block appearance or output, or to enable System object usage in a For Each subsystem, use the provided implementation methods to customize your System object. For more information about defining a System object, see Define Basic System Objects or System Objects.

Methods

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Block Appearance

Input and Output

Nondirect Feedthrough

Sample Time

For Each Subsystems

Topics

Overview

• Define System Object for Use in Simulink
  Develop MATLAB System block and interactively preview block dialog box.
• System Design in Simulink Using System Objects
  Design systems in Simulink using System objects.
• Simulink Engine Interaction with System Object Methods
  Follow a process view of the order in which the MATLAB System block invokes System object methods within the context of the Simulink engine.
• Considerations for Using System Objects in Simulink
  Consider these guidelines when working with variable-size signals, tunable parameters, and For Each subsystems.

Input and Output

• Set Model Reference Discrete Sample Time Inheritance
  Disallow model reference discrete sample time inheritance for a System object.
• Use Global Variables in System Objects
  Define global variables for use in System objects.
• Specify Output
  If Simulink cannot infer the System object output characteristics, add methods to specify the size, data type, complexity, or discrete state output.
• Add and Implement Propagation Methods
  To define output specifications, use propagation methods.

Special Use Cases

• Use System Objects in Feedback Loops
  Process nondirect feedthrough data through the System object.
• Use Update and Output for Nondirect Feedthrough
  Implement nondirect feedthrough for a System object using the updateImpl,outputImpl, and isInputDirectFeedthroughImpl methods.
• Enable For Each Subsystem Support
  Enable For Each subsystem support by using a System object in a SimulinkFor Each subsystem.
• Specify Sample Time for MATLAB System Block System Objects
  This example shows how to control the sample time of the MATLAB System block using System object™ methods.

Featured Examples