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Edge Detector

Detect change in logical signal state

Library

Control and Measurements/Logic

Description

The Edge Detector block outputs a needle impulse when a change in the logical input is detected.

The Edge Detector block can be programmed to detect a rising edge (when the input goes from false to true), a falling edge (when the input goes from true to false), or either edge (any change in input is detected).

Dialog Box and Parameters

Edge detction

Select the detection criteria triggering the output impulse.

Initial condition of previous input

Specify the initial value of the previous input. The Edge Detector block can detect an edge at t = 0 if the input is different from the specified value.

Sample time (-1 for inherited)

Specify the sample time of the block, in seconds. Set to 0 to implement a continuous block.

Inputs and Outputs

The input signal must be a Boolean signal. The output is Boolean.

Characteristics

Direct FeedthroughYes
Sample TimeSpecified in the Sample Time parameter
Scalar ExpansionYes
DimensionalizedYes
Zero-Crossing DetectionYes

Example

The power_Logicpower_Logic example shows the operation of the Edge Detector block.

The model sample time is parameterized with the variable Ts (default value Ts = 50e-3). To simulate a continuous Edge Detector block, specify Ts = 0 in the MATLAB® Command Window.

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