Fault Modeling
R2026bUse 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
 | Fault Data Inport | Import Simulink model data into fault behavior (Since R2024b) |
 | Fault Inport | Capture inlet signal for fault behaviors (Since R2023b) |
 | Fault Outport | Output signals from fault behaviors (Since R2023b) |
 | Fault Subsystem | Model behaviors for fault injection (Since R2023b) |
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 a 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
Add faults to Model blocks and manage instance-specific or shared fault properties across model references. - Manage Faults in Referenced Subsystems
Add faults to referenced subsystem blocks and manage instance-specific or shared fault properties across subsystem references. (Since R2026a) - Synchronize Faults in Linked Library Blocks
Synchronize faults from linked library blocks. (Since R2026a)
Updating Fault Properties and Behaviors
- Specify Fault Properties
Specify fault names, behaviors, trigger types, and other properties when creating faults or by using the Property Inspector. - Add Predefined and Custom Fault Behaviors
Create custom fault behaviors and add them to a list of fault behaviors in a fault behavior library. You can also modify fault behaviors within the library, and export and share them with others. - Access Model Output Data 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. - Avoid Fault Modeling and Simulation Issues
Prevent compilation and simulation errors when working with faulted models.
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 to analyze 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.
Test Fault Mitigation Logic by Using Fault Tree Analysis
Design fault mitigation logic by using a fault tree and verify its implementation in your design.
