Documentation

Step

Generate 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 numeric block 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 (that is, 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.

For more information, see Data Types Supported by Simulink in the Simulink® documentation.

Parameters and Dialog Box

Step time

Specify 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

Specify the block output until the simulation time reaches the Step time parameter. The default is 0.

Final value

Specify the block output when the simulation time reaches and exceeds the Step time parameter. The default is 1.

Sample time

Specify the sample rate of step. See Specify 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. See Determining the Output Dimensions of Source Blocks in the Simulink documentation.

Enable zero-crossing detection

Select to enable zero-crossing detection. For more information, see Zero-Crossing Detection.

Examples

The following Simulink examples show how to use the Step block:

Characteristics

Sample Time

Specified in the Sample time parameter

Scalar Expansion

Yes, of parameters

Dimensionalized

Yes

Zero-Crossing Detection

Yes, if enabled.

See Also

Ramp

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