Documentation
TRUNC
Function name
TRUNC
ST call
PROGRAM TRUNC_DEMO
VAR
REAL1: REAL;
D1: DINT;
END_VAR
D1:= TRUNC(IN:=REAL1);
END_PROGRAM
Description
Returns the input value truncated to a whole number, cutting off the decimal part.
Inputs
| Input | Type | Description |
|---|---|---|
| IN | ANY_REAL | Input value |
Outputs
| Output | Type | Description |
|---|---|---|
| => | DINT | Output value |
Application example
Calculation example
| Input value | round ( _TO_ ) | floor | ceil | trunc |
|---|---|---|---|---|
| 5.5 | 6 | 5 | 6 | 5 |
| 3.8 | 4 | 3 | 4 | 3 |
| 2.3 | 2 | 2 | 3 | 3 |
| -2.3 | -2 | -3 | -2 | -2 |
| -3.8 | -4 | -4 | -3 | -3 |
| -5.5 | -6 | -6 | -5 | -5 |