Simulink^®

Detect Fall Nonpositive

Detect falling edge when signal's value decreases to nonpositive value, and its previous value was strictly positive

Library

Logic and Bit Operations

Description

The Detect Fall Nonpositive block determines if the input is less than or equal to zero, and its previous value was positive where

The output is true (equal to 1), when the input signal is less than or equal to zero, and its previous value was greater than zero.
The output is false (equal to 0), when the input signal is greater than zero, or if it is nonpositive, its previous value was nonpositive.

Data Type Support

The Detect Fall Nonpositive block accepts signals of any data type supported by Simulink^® software, including fixed-point data types. The block output is uint8.

Parameters and Dialog Box

Initial condition: Set the initial condition of the Boolean expression U/z <= 0.

Characteristics