Logic Guide - TRUNC (Built-in Functions, Function Blocks, and Conversions)

TRUNC

Function Name	TRUNC
Description	Truncates the floating value of the input into a double integer value. The double integer value is used as the output.
Arguments	Input 1 {REAL or LREAL}. For more information on the data types for the inputs and outputs, see Data Type Hierarchy.
Returns	Output {DINT}

Function Name

TRUNC

Description

Truncates the floating value of the input into a double integer value. The double integer value is used as the output.

Arguments

Input 1 {REAL or LREAL}.

For more information on the data types for the inputs and outputs, see Data Type Hierarchy.

Returns

Output {DINT}

Example:

Function Block Diagram - TRUNC:

In this example, the input of 5.75423 is provided by the CurrentValueFormatted property of a point. The TRUNC function truncates the value into a double integer value of 5.

ST Program - TRUNC:

The syntax for a TRUNC function in an ST Program is:

Output := TRUNC (Input 1);

Where Output and Input 1 are defined as variables earlier in the ST program. The Input 1 variable represents a REAL or LREAL type of value (the output is the same type of value as Input 1).