Signals transmit data between two blocks in a simulation. The data could be the calculated output of a block, or simply a message. The value of signals are calculated at all points during the simulation time. You can display the signal data and properties during and after simulation, see the real-time values on a block diagram, or you can log the values as variables in the workspace. Also, you can export the signals to a file or to a workspace to investigate further.
You can control the mathematical behavior of a model by specifying signal characteristics such as numeric data type, initial value, and value range. For more information, see Signal Basics.
|Signal Specification||Specify desired dimensions, sample time, data type, numeric type, and other attributes of signal|
|IC||Set initial value of signal|
|Probe||Output signal attributes, including width, dimensionality, sample time, and complex signal flag|
|Rate Transition||Handle transfer of data between blocks operating at different rates|
|Signal Editor||Display, create, edit, and switch interchangeable scenarios|
|Weighted Sample Time||Support calculations involving sample time|
|Width||Output width of input vector|
|Convert model to use only explicit signal resolution|
|Import signal data and properties from Signal Builder block to Signal Editor block|
|Start Signal Editor|
|Specify instance-specific properties of signal or discrete state|
|Specify common set of signal properties for reuse (Since R2021b)|
|Signal path traced using |
|Signal Properties||View and edit signal properties|
|Instrumentation Properties||View and edit logging and visualization properties for logged signal|
|Property Inspector||Edit parameters and properties for any Simulink model element|
|Model Data Editor||Inspect and edit data items (signals, parameters, and states) in a table that you can sort, group, and filter|
Get Started with Signals
- Investigate Signal Values
Initialize, access, and view the values that signals have during a simulation run.
- Specify Signal Ranges
Specify the minimum and maximum value that a signal can attain during simulation. Fully specify your design and optimize data types and the generated code by specifying the minimum and maximum value that a signal can attain during simulation.
- Determine Signal Dimensions
Inspect and control signal dimensionality.
- Initialize Signals and Discrete States
Some systems contain signals and states whose initial values you must specify, for example, the starting position and velocity of a bouncing ball.
- Configure Signals as Test Points
Use test points to exclude signal lines from optimizations which enables you to access the simulation data.
- Specify Common Set of Signal Properties as Value Type
Create a reusable value type for common signal properties, such as the application-specific signal properties of wind velocity. (Since R2021b)
Display Signal Properties
- Highlight Signal Sources and Destinations
Trace a signal to its source or destination while debugging or exploring a model.
- View Signal Values Using Port Value Labels
View signal values in the block diagram during simulation to understand, analyze, and debug your model.
- Display Signal Attributes
Improve model readability by displaying signal attributes, such as data types and dimensions, in the block diagram.
- Signal Label Propagation
Name a signal to identify and access it more easily. Take advantage of signal label propagation to reduce the effort of naming a signal that crosses system boundaries.
- Trace Connections Using Interface Display
Display interfaces to trace signals through the nested levels, annotate signal characteristics, and view units associated with signals.
- Variable-Size Signal Basics
Create a variable-size signal whose size and values can change during a simulation.
- Inspect Variable-Size Signals on Simulink Models
Inspect example models that show how to use variable-size signals.
- Unbounded Variable-Size Signals
Use unbounded variable-size signals to carry data whose size is unknown during model compilation.