Compare To Constant

Determine how signal compares to specified constant

  • Library:
  • Simulink / Logic and Bit Operations

    HDL Coder / Logic and Bit Operations

Description

The Compare To Constant block compares an input signal to a constant. Specify the constant in the Constant value parameter. Specify how the input is compared to the constant value with the Operator parameter.

Ports

Input

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Input signal, specified as a scalar, is compared with zero.The block first converts its Constant value parameter to the input data type, and then performs the specified operation.

Data Types: single | double | int8 | int16 | int32 | uint8 | uint16 | uint32 | Boolean | fixed point | enumerated | bus

Output

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The output is 0 if the comparison is false, and 1 if it is true.

Data Types: uint8 | Boolean

Parameters

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This parameter can have these values:

  • == — Determine whether the input is equal to the specified constant.

  • ~= — Determine whether the input is not equal to the specified constant.

  • < — Determine whether the input is less than the specified constant.

  • <= — Determine whether the input is less than or equal to the specified constant.

  • > — Determine whether the input is greater than the specified constant.

  • >= — Determine whether the input is greater than or equal to the specified constant.

Programmatic Use

Block Parameter: relop
Type: character vector
Values: '==' | '~='| '<' |'<='| '>='| '>'
Default: '<='

Specify the constant value to which the input is compared.

Programmatic Use

Block Parameter: const
Type: character vector
Value: scalar | vector | matrix | N-D array
Default: '3.0'

Specify the data type of the output, boolean or uint8.

Programmatic Use

Block Parameter: OutDataTypeStr
Type: character vector
Values:'boolean' | 'uint8'
Default: 'boolean'

Select to enable zero-crossing detection. For more information, see Zero-Crossing Detection.

Programmatic Use

Block Parameter: ZeroCross
Type: character vector
Values: 'off' | 'on'
Default: 'on'

Block Characteristics

Data Types

Boolean | double | enumerated | fixed point | integer | single

Direct Feedthrough

no

Multidimensional Signals

yes

Variable-Size Signals

yes

Zero-Crossing Detection

yes

Extended Capabilities

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

PLC Code Generation
Generate Structured Text code using Simulink® PLC Coder™.

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

Introduced before R2006a