Byte order: little endian
Can be used as extension of the data registers.
For 32-bit data: DFL2 occupies FL2 (low) and FL3 (high)
For 64-bit data: LFL2 occupies FL2 (lowest) and FL3, FL4, FL5 (highest).
FP address: FL4329, DFL2, LFL2
IEC address: %MW9.4329, %MD9.2, %ML9.2