How to calculate the binary floating point number of Mitsubishi PLC and how to deal with the high and low bits?

Floating-point number addition operation, because the data is saved in integer form by default in plc, it is necessary to first convert the integer into floating-point number form, that is, flt instruction, and then use class E instruction to operate, and if necessary, convert floating-point number into integer.

Then an int instruction is needed for conversion at this time.