Lenze PLC Designer PLC Designer (R2-x) - Manual (Page 491)

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IEC Operators and additional norm extending functions

DMS 3.2 EN 02/2011 TD29 489
9.9.4 Conversion between Integral Number Types
Conversion from an integral number type to another number type:
When you perform a type conversion from a larger to a smaller type, you risk losing
some information. If the number you are converting exceeds the range limit, the first
bytes for the number will be ignored.
Example in ST:
si := INT_TO_SINT(4223); (* Result is 127 *)
If you save the integer 4223 (16#107f represented hexadecimally) as a SINT variable, it
will appear as 127 (16#7f represented hexadecimally).
Example in IL:
LD 2
INT_TO_REAL
MUL
Example in FBD: