The IEC operator is used for converting the REAL data type into the INT data type. CODESYS takes only the integer part of the number.
TRUNC_INT corresponds to the TRUNC operator in CoDeSys V2.3, and it is used automatically at this point when importing V2.3 projects. Note the
change function of TRUNC.
If CODESYS cannot represent the input value by a DINT or INT, then the result of this function is undefined. The behavior of such input values
is platform-dependent.
NOTICE
If the operand value for a type conversion operator is outside of the value range
of the target data type, then the result output depends on the processor type and
is therefore undefined. This is the case, for example, when a negative operand value
is converted from LREAL to the target data type UINT.
Information can be lost when converting from larger data types to smaller data types.
Examples
Result in iVAR: 1
ST:
iVar := TRUNC_INT(1.9); (* Result: 1 *) iVar := TRUNC_INT(-1.4); (* Result: -1 *)
See also