48 Bit Integer Data to Real Coversion

DearAll,
I have a problem in coverting 48bit integer to Real.Kindly see the details as below
System:-
compactlogix L43 With MVI69-MCM communication with E&H energy meter RMS621 through MODBUS

Here i am able to communicate with the meter as shown in attached picture(MCM.DATA.Readdata[0]to MCM.DATA.Readdata[20]) .I have to read 7 parameters from the meter & each parameter consist of three 16 bit registers.

Kindly suggest, how i can convert this three 16bit register to a Real Value.

Regards
Joseph

conversion depends on how the words are setup.
the simplest one i would think of is Multiply the word with 65536 and do this in real. (the result is not precise but it does work.
for the third word multiply it 2 times with 65536.