IM02601006E www.eaton.com B-2
IQ 150S/250S B: Modbus Map
FLOAT:
32-bit IEEE floating point number spanning 2
registers. The lower-addressed register is the
high order half (i.e., contains the exponent).
B.4: Floating Point Values
Floating Point Values are represented in the following format:
The formula to interpret a Floating Point Value is:
-1
sign
x 2
exponent-127
x 1.mantissa = 0x0C4E11DB9
-1
sign
x 2
137-127
x 1· 1000010001110110111001
-1 x 2
10
x 1.75871956
-1800.929
Formula Explanation:
C4E11DB9 (hex)
11000100 11100001 00011101 10111001
(binary)
The sign of the mantissa (and therefore the number) is 1, which represents a negative value.
The Exponent is 10001001 (binary) or 137 decimal.
Register
0
1
Byte
0
1
0
1
Bit
7
6
5
4
3
2
1
0
7
6
5
4
3
2
1
0
7
6
5
4
3
2
1
0
7
6
5
4
3
2
1
0
Meaning
s
e
e
e
e
e
e
e
e
m
m
m
m
m
m
m
m
m
m
m
m
m
m
m
m
m
m
m
m
m
m
m
sign
exponent
mantissa
Register
0x0C4E1
0x01DB9
Byte
0x0C4
0x0E1
0x01D
0x0B9v
Bit
7
6
5
4
3
2
1
0
7
6
5
4
3
2
1
0
7
6
5
4
3
2
1
0
7
6
5
4
3
2
1
0
1
1
0
0
0
1
0
0
1
1
1
0
0
0
0
1
0
0
0
1
1
1
0
1
1
0
1
1
1
0
0
1
Meaning
s
e
e
e
e
e
e
e
e
m
m
m
m
m
m
m
m
m
m
m
m
m
m
m
m
m
m
m
m
m
m
m
sign
exponent
mantissa
1
0x089 + 137
0b011000010001110110111001
Summary of Contents for IQ 150S
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