Sources

Provide inputs for simulation using blocks that define and generate signals or load signal data

Use blocks from the Sources library to provide input signals for simulation.

Generate signals in your model using blocks such as the Sine Wave block and the Constant block.
Load signal data from the workspace or a file using blocks such as the Playback block, the From Workspace block, the From File block, and the From Spreadsheet block.
Create and edit signals using blocks such as the Signal Editor block.

Blocks

Band-Limited White Noise	Introduce white noise into continuous system
Chirp Signal	Generate sine wave with increasing frequency
Clock	Display and provide simulation time
Constant	Constant value
Counter Free-Running	Count up and overflow back to zero after reaching maximum value for specified number of bits
Counter Limited	Count up and wrap to zero after specified upper limit
Digital Clock	Output simulation time at specified sampling interval
Enumerated Constant	Generate enumerated constant value
From File	Load data from MAT file into Simulink model
From Spreadsheet	Read data from spreadsheet
From Workspace	Load signal data from workspace into Simulink model
Ground	Ground unconnected input port
In Bus Element	Select input from external port
Inport	Create input port for subsystem or external input
Playback	Load data from workspace, file, or Simulation Data Inspector (Since R2022b)
Pulse Generator	Generate square wave pulses at regular intervals
Ramp	Generate constantly increasing or decreasing signal
Random Number	Generate normally distributed random numbers
Repeating Sequence	Generate arbitrarily shaped periodic signal
Repeating Sequence Interpolated	Output discrete-time sequence and repeat, interpolating between data points
Repeating Sequence Stair	Output and repeat discrete time sequence
Signal Editor	Display, create, edit, and switch interchangeable scenarios
Signal Generator	Generate various waveforms
Sine Wave	Generate sine wave, using simulation time as time source
Step	Generate step function
Uniform Random Number	Generate uniformly distributed random numbers
Waveform Generator	Output waveforms using signal notations