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Unit Conversion

Convert units

  • Unit Conversion block

Simulink / Signal Attributes


The Unit Conversion block converts the unit of the input signal to the output signal. The block can perform the conversion if the units are separated by a scaling factor or offset, or are inverse units, for example:

  • y = a*U

  • y = a*U+b, where a is the scale and b is the offset

  • y = a/U

This block supports normal, accelerator, and rapid accelerator modes and fast restart.



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Input signal, specified as a scalar, vector, matrix, or N-D array.

Data Types: single | double | int8 | int16 | int32 | int64 | uint8 | uint16 | uint32 | uint64 | fixed point


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Output signal with converted units with the same dimensions as the input signal.

Data Types: single | double | int8 | int16 | int32 | int64 | uint8 | uint16 | uint32 | uint64 | fixed point


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Specify the output data type.

  • Inherit: Inherit via internal rule — Simulink® chooses intermediate and output data types to balance numerical accuracy, performance, and generated code size, while accounting for the properties of the embedded target hardware. If you change the embedded target settings, the data type selected by the internal rule might change.

  • Inherit: Inherit via back propagation — Output data type is inherited via back propagation. Internal rules determine the intermediate data types and Simulink casts the final results to the output data type.

Programmatic Use

Block Parameter: OutDataTypeStr
Type: character vector
Values: 'Inherit via internal rule' | 'Inherit via back propagation'
Default: 'Inherit via internal rule'

Block Characteristics

Data Types

double | fixed point | integer | single

Direct Feedthrough


Multidimensional Signals


Variable-Size Signals


Zero-Crossing Detection


Extended Capabilities

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

Fixed-Point Conversion
Design and simulate fixed-point systems using Fixed-Point Designer™.

Version History

Introduced in R2016a