# LGF_IsNumber (FC / 1.0.0)

Overview

Author: Siemens Digital Industry

## Short description

This function proves a LReal datatype for a valid number and numeric range.

### Block Interface

| LGF_IsNumber (FC) |
--- | --- | ---
LReal |  |  | number |  | Ret_Val |  |  | Bool
LReal |  |  | validRangeMin |  |  |  |  |
LReal |  |  | validRangeMax |  |  |  |  |

### Input parameter

Identifier | Data type | Description
--- | --- | ---
number | LReal | Number to validate
validRangeMin | LReal | Minimum real number for valid range
validRangeMax | LReal | Maximum real number for valid range

### Output parameter

Identifier | Data type | Description
--- | --- | ---
Ret_Val | Bool | TRUE: Is real number FALSE: Out of range / NAN

## Change log

Version & Date | Change description
--- | ---
| 1.0.0 | Siemens SIMATIC Systems Support
| 29.07.2025 | First release version