Skip to main content

7.10.5 SYS._TRUNC_

Function​

Truncate function, this instruction selects only the integer part of the input value and outputs this integer as the result

LD graphics​

Alt text

Parameter description​

Interface variableDeclarationData typeDescription
INVar_InputREAL(LREAL)Data to be converted
Function nameReturn valueINT (DINT, LINT)Output the converted result
warning
  • When using this instruction, it is recommended to specify the source data type and target data type
  • In LD, select the source data type by clicking the "???" in the upper left corner of the graph; click the "???" in the upper right corner of the graph to select the target data type
  • When adding by dragging in ST, the data type selection window as shown below will appear:
  • alt text

Example​

  • LD example is shown in the following animation:

alt text

  • ST example is shown in the following code:
OUT_INT := REAL_TRUNC_INT(IN_REAL);