Step (Simulink Reference)

Generate a step function

Library

Sources

Description

The Step block provides a step between two definable levels at a specified time. If the simulation time is less than the Step time parameter value, the block's output is the Initial value parameter value. For simulation time greater than or equal to the Step time, the output is the Final value parameter value.

The block's numeric parameters must be of the same dimensions after scalar expansion. If the Interpret vector parameters as 1-D option is off, the block outputs a signal of the same dimensions and dimensionality as the parameters. If the Interpret vector parameters as 1-D option is on and the numeric parameters are row or column vectors (i.e., single row or column 2-D arrays), the block outputs a vector (1-D array) signal; otherwise, the block outputs a signal of the same dimensionality and dimensions as the parameters.

Data Type Support

The Step block outputs real signals of type double.

Parameters and Dialog Box

Opening this dialog box causes a running simulation to pause. See Changing Source Block Parameters in the online Simulink documentation for details.

Step time: The time, in seconds, when the output jumps from the Initial value parameter to the Final value parameter. The default is 1 second.
Initial value: The block output until the simulation time reaches the Step time parameter. The default is 0.
Final value: The block output when the simulation time reaches and exceeds the Step time parameter. The default is 1.
Sample time: Sample rate of step. See Specifying Sample Time" in the online documentation for more information.
Interpret vector parameters as 1-D: If selected, column or row matrix values for the Step block's numeric parameters result in a vector output signal; otherwise, the block outputs a signal of the same dimensionality as the parameters. If this option is not selected, the block always outputs a signal of the same dimensionality as the block's numeric parameters.
Enable zero crossing detection: Select to enable zero crossing detection to detect step times. For more information, see Zero Crossing Detection in the Using Simulink documentation.

Characteristics

Sample Time
Specified in the Sample time parameter

Scalar Expansion
Yes, of parameters

Dimensionalized
Yes

Zero Crossing
Yes, if enabled.

Sample Time	Specified in the Sample time parameter
Scalar Expansion	Yes, of parameters
Dimensionalized	Yes
Zero Crossing	Yes, if enabled.

State-Space Stop Simulation