LEYBOLD DeviceNet ITR 200 D - Appendix A: Conversion of a Floating Number According to IEEE 754

Conversion
30
17200138_002_C0 – (2016-10) –
 Leybold
Appendix A: Conversion of a Floating Number According to
IEEE 754
AA BB CC DD
h
(4-Byte, floating format)
DD
h
CC
h
BB
h
AA
h
SEEE EEEE
b
EMMM MMMM
b
MMMM MMMM
b
MMMM MMMM
b
S EEEE EEEE
b
MMM MMMM MMMM MMMM MMMM MMMM
b
 

1+
= 1+

Sign = Exponent = Mantissa =
-1
S
XYZ
d
RSTUV
d
Sign × 2
(Exponent-127)
× Mantissa
MMMMMMMMMMMMMMMMMMM MMMM
b
2
23








NNNNN
d
d
8388608






Converted Number
Number Received
General
1. Reverse the
Sequence of the HEX
W
ords
2. Separate Into Bytes
3. Calculate
Sign 8-Bit exponent 23-Bit mantissa