Simulink Functions

Define functions that are accessible from across the Simulink model hierarchy

You can use Simulink^® functions to define functions that are accessible in the Simulink model hierarchy. A Simulink function calculates a set of outputs based on the provided inputs and the implemented behavior of the function. You can use Simulink functions to:

Specify the function prototype which includes the function name, input and output arguments, for example, y = f(u).
Implement function behavior in the Simulink environment using a Simulink Function block, an exported function from a Stateflow^® chart, or an S-Function block.
Call and reuse your function across the model hierarchy.

For more information, see Simulink Functions Overview.

Blocks

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Functions

Simulink Function	Define a function using Simulink blocks
Chart	Implement control logic with finite state machine

Function Callers

Function Caller	Call a Simulink function
MATLAB Function	Include MATLAB code in Simulink models
Chart	Implement control logic with finite state machine

Local Environment Signals

Inport	Create input port for subsystem or external input
Outport	Create output port for subsystem or external output
Function Element	Specify function to be called via exporting function port (Since R2022a)
Function Element Call	Specify function call to be issued via invoking function port (Since R2022a)

Topics

Understanding Simulink Functions

Simulink Functions Overview
Use Simulink functions to define functions that are accessible in the Simulink model hierarchy.
Define a Simulink Function in a Model
Define a Simulink function using a Simulink Function block, an exported Stateflow function, or an S-Function block.
Call a Simulink Function from a Model
Call a Simulink function using a Function Caller block, a Stateflow chart, a MATLAB Function or MATLAB System block, an S-Function block, or an event action of a SimEvents^® block.
Scoped, Global, and Port-Scoped Simulink Function Blocks Overview
Specify visibility and access of Simulink Function blocks.
Simulink Function Blocks in Referenced Models
Add and access functions in model components.

Scoped Simulink Functions

Scoped Simulink Function Blocks in Subsystems
Limit the scope of a function to a subsystem.
Scoped Simulink Function Blocks in Models
Limit the scope of a function to a model.
Resolve Error: Block Is Unable to Call The Scoped Simulink Function
Troubleshoot block unable to call the function error in Simulink.

Port-Scoped Simulink Functions

Model Client and Server Components Using Function Ports
Use function ports to model client and server components in a service-oriented architecture.
Service Interfaces Overview (System Composer)
Create client and server ports, author service interfaces, and simulate service-oriented communication.

Related Information

Model Service-Oriented Communication Between Sensors (System Composer)
Simulate Asynchronous Services for Vehicle Headlight Management (System Composer)
Trigger Simulink Components with Discrete Events in SimEvents (SimEvents)
Configure AUTOSAR Client-Server Communication (AUTOSAR Blockset)
Model AUTOSAR Adaptive Service Communication (AUTOSAR Blockset)
Generate Reentrant Code from Simulink Function Blocks (Embedded Coder)

Featured Examples

Model Service Access from Application Software Using Scoped Simulink Functions

Model services and accessing these services from a separate component.

Open Live Script

Monitor Ink Status on Shared Printer Using Simulink Functions

How multiple clients can send requests to a server and receive a status from the server. Using Simulink® functions, different subsystems can call functions from other subsystems and interact in Simulink and Stateflow®. In this example, you model the ink status monitoring of a shared printer using Simulink functions.

Open Live Script

Reuse Multiple Instances of a Simulink Function

To reuse components, use multiple instances of a function.

Open Model

Dynamic Priority Scheduling of Functions

A common modeling pattern to dynamically schedule the execution of functions using a Stateflow® chart.

Open Model

Temperature Control System Communicating with Messages

Distributed control of room temperatures by processing messages from room thermostats and communicating control commands using messages to different receivers.

Open Model

Wireless Tire Pressure Monitoring System with Fault Logging

Model a wireless tire pressure monitoring system with fault logging using message communication.

Open Example