Lenze PLC Designer PLC Designer (R2-x) - Manual (Page 492)

L-force | PLC Designer
IEC Operators and additional norm extending functions
490 DMS 3.2 EN 02/2011 TD29

9.9.5 REAL_TO-/ LREAL_TO Conversions
Converting from the variable type REAL or LREAL to a different type:
The value will be rounded up or down to the nearest whole number and converted
into the new variable type. Exceptions to this are the variable types STRING, BOOL,
REAL and LREAL.
Please regard at a conversion to type STRING that the total number of digits is limited
to 16. If the (L)REAL-number has more digits, then the sixteenth will be rounded. If the
length of the STRING is defined to short, it will be cut beginning from the right end.
When you perform a type conversion from a larger to a smaller type, you risk losing
some information.
Example in ST:
i := REAL_TO_INT(1.5); (* Result is 2 *)
j := REAL_TO_INT(1.4); (* Result is 1 *)
i := REAL_TO_INT(-1.5); (* Result is -2 *)
j := REAL_TO_INT(-1.4); (* Result is -1 *)
Example in IL:
LD 2.7
REAL_TO_INT
GE %MW8
Example in FBD: