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PS Constant Delay

Delay input physical signal by specified time

  • PS Constant Delay block

Simscape / Foundation Library / Physical Signals / Delays


The PS Constant Delay block generates the output physical signal, Y, by delaying the input physical signal, U:

Y = U ( tτ )

where τ is the delay time.

The delay time is constant throughout the simulation. You specify the value of the delay time as the Delay time parameter.

For the initial time interval, when t <= StartTime + τ, the block outputs the Input history parameter value. The unit specified for the Input history parameter must be commensurate with the unit of the output signal.


  • When simulating a model that contains blocks with delays, memory allocation for storing the data history is controlled by the Delay memory budget [kB] parameter in the Solver Configuration block. If this budget is exceeded, simulation errors out. You can adjust this parameter value based on your available memory resources.

  • For recommendation on how to linearize a model that contains blocks with delays, see Linearizing with Simulink Linearization Blocks.

Untyped physical ports facilitate unit propagation. The output signal has the same physical unit as the input signal.



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Input physical signal.


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Output physical signal.


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The output signal value and unit during the initial time interval, until the specified delay time elapses after the start of simulation. The first edit box represents the signal value.

The second combo box represents the signal unit, which must be commensurate with the unit of the output signal at port Y. By default, the unit is 1 (unitless). You can select a unit from the drop-down list or type the desired unit name, such as rpm, or a valid expression, such as rad/s. For more information and a list of unit abbreviations, see How to Specify Units in Block Dialogs and Unit Definitions.

The delay for the signal, in units of time. The parameter value must be positive.

Extended Capabilities

C/C++ Code Generation
Generate C and C++ code using Simulink® Coder™.

Version History

Introduced in R2012a

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