Simulink Reference

Difference

Calculate the change in a signal over one time step

Library

Discrete

Description

The Difference block outputs the current input value minus the previous input value.

Data Type Support

The Difference block accepts signals of any data type supported by Simulink, including fixed-point data types.

Parameters and Dialog Box

The Main pane of the Difference block dialog appears as follows:

Initial condition for previous output

Set the initial condition for the previous output.

The Signal data types pane of the Difference block dialog appears as follows:

Output data type and scaling

Specify the output data type and scaling via the dialog box, or inherit the data type and scaling from an internal rule or by backpropagation.

Output data type

Set the output data type. This parameter is only visible if you select Specify via dialog for the Output data type and scaling parameter.

Output scaling

Set the output scaling using either binary point-only or [Slope Bias] scaling. This parameter is only visible if you select Specify via dialog for the Output data type and scaling parameter.

Lock output scaling so autoscaling tool can't change it

If you select this check box, the output scaling is locked.

Round toward

Rounding mode for the fixed-point output.

Saturate to max or min when overflows occur

If selected, fixed-point overflows saturate.

Characteristics

Direct Feedthrough	Yes
Scalar Expansion	Yes, of inputs and gain

Detect Rise Positive

Digital Clock

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