How to do it:
Multiply the number by 100
Copy it to a DINT (32 bit integer) (This will strip the decimal)
Copy it to a FLOAT or REAL (sorry don't know Siemens) (So you can have the decimal back)
Divided by 100
Sorry long way around the barn but it would work. You could make the equivalent of and AOI then you just have the number in and the number out.