Monostable

(To be removed) Implement monostable flip-flop (one-shot multivibrator)

The Specialized Power Systems library will be removed in R2026a. Use the Simscape™ Electrical™ blocks and functions instead. For more information on updating your models, see Upgrade Specialized Power System Models to use Simscape Electrical Blocks.

Library

Simscape / Electrical / Specialized Power Systems / Control

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Description

The Monostable block outputs a true pulse when a change in the logical input is detected.

The Monostable 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). The Monostable block ignores any edge occurring when the pulse is true.

Parameters

Edge detection

Select the detection criteria triggering the output pulse. Choices are Rising (default), Falling, or Either.

Pulse duration (s)

Specify the duration of the output true state. When the Sample time parameter is greater than 0, the Pulse duration value must be a multiple of the sample time. Default is 0.015.

Initial condition of previous input

Specify the initial value of the previous input (0 or 1). The Monostable block can detect an edge at t = 0 if the input is different from the specified value. Default is 0.

Sample time

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

Inputs and Outputs

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

Characteristics

Direct Feedthrough	Yes
Sample Time	Specified in the Sample Time parameter
Scalar Expansion	Yes, of parameters
Dimensionalized	Yes
Zero-Crossing Detection	Yes (in continuous-time domain)

Version History

Introduced in R2013a