Fault Modeling
Use Simulink Fault Analyzer™ to model faults and conditionals. You can use the graphical interface or programmatic options to configure faults in models.
Functions
Objects
Fault | Create or modify faults in models (Since R2023b) |
Conditional | Create or modify conditionals in models (Since R2023b) |
Symbol | Create or modify symbols in conditionals (Since R2023b) |
Blocks
Topics
Creating Faults
- Manually Trigger Faults in Models
Configure faults to be injected with manual control. (Since R2024a) - Create Fault-Embedded Models
Export models that contain faults to version that contains embedded faults. (Since R2025a) - Add and Simulate Faults in System Composer Models
Add faults to System Composer™ components and simulate faults on component interactions. - Add and Configure Faults Programmatically
Access and change fault properties directly in Simulink models using several programmatic options. - Add Fault Behaviors to Buses
Add faults and define their behaviors on nonvirtual buses. - Copying Faults
Duplicate blocks that have faults to copy faults in your models. (Since R2025a) - Manage Faults in Referenced Models
Modify faults in referenced models. - Manage Faults in Referenced Subsystems
Modify faults in referenced subsystems. (Since R2026a) - Synchronize Faults in Linked Library Blocks
Synchronize faults from linked library blocks. (Since R2026a)
Updating Fault Properties and Behaviors
- Specify Fault Properties
View and adjust fault properties. - Create Predefined and Custom Fault Behaviors
Create custom fault behaviors and add them to a list of fault behaviors in with a fault behavior library. You can also modify faults within the library, and export and share them with others. - Access Data from Model Outputs in Fault Behaviors
Create fault behaviors that use additional model data by using Fault Data Inport blocks. (Since R2024b) - Create and Manage Conditionals
Use conditionals to define conditions that you can use to trigger faults. - Best Practices for Modeling and Simulating Faults
Avoid model simulation errors caused by faults by using these best practices.
Related Information
Featured Examples
Generate Code from Fault-Embedded Models
Add faults to a model, create the fault-embedded model, and generate C code.
Evaluate Fault Combinations on a Fault-Tolerant Fuel System
Simulate faults on a fault tolerant fuel system and analyze their effects in an FMEA.
Conduct Fault Sensitivity Study on Warehouse Robot
Adjust fault behavior parameters to test robot brake system and verify results in an FMEA.
Verify Fault Detection Logic in Aircraft Elevator Control System
Use conditionals to verify that fault mitigation logic deploys and verify controller behavior in an FMEA.
Perform Safety Analysis on Aircraft Elevator by Running Tests
Run tests in the Simulink Test Manager from the Safety Analysis Manager to analyze aircraft elevator fault detection logic.
Perform Fault Analysis of a Battery Management System
Inject and simulate faults on a battery management system.
Perform Fault Analysis on a Motor Drive Speed Sensor
Inject and simulate faults on a motor drive speed sensor.
Perform a Failure Mode and Effects Analysis on a Rotorcraft UAV
Use the Safety Analysis Manager and MATLAB® to construct safety properties in an FMEA and validate them for a UAV.
