Yokogawa 212 Heat Calculator - Manual (Page 45)

Notes:
FP This variable is represented in IEEE-754 Floating Point 4 byte
format and requires two 2 byte data registers used as Modicon's
floats:
IEEE-754 Modicon Registers
1st byte low byte (register X)
2nd byte high byte (register X)
3rd byte low byte (register X+1)
4th byte high byte (register X+1)
This means that two data registers must be read/written to
obtain/preset one data value.
LI This variable is represented as a long integer in 4 byte format and
requires two 2 byte data registers:
Long Integer Modicon Registers
1st byte (MSB) high byte (register X)
2nd byte low byte (register X)
3rd byte high byte (register X+1)
4th byte (LSB) low byte (register X+1)
This means that two data registers must be read/written to
obtain/preset one data value.
Communications 43