Delta 100 Series Installation Manual download pdf (Page 82)

IQ 100 Series (130/140/150) Meter

App B: Modbus Map

82 User and Installation Manual IM02601003E-September 2011 www.eaton.com

Floating Point Values

Floating Point Values are represented in the following format:

Regis-

ter

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

Mean-

ing

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

The formula to interpret a Floating Point Value is: -1

sign

x 2

exponent-127

x1.mantissa = 0x0C4E11DB9

-1

sign

x 2

137-127

x 1• 1000010001110110111001

-1 x 2

x 1.75871956

-1800.929

Regis-

ter

0x0C4E1 0x01DB9

Byte

0x0C4 0x0E1 0x01D 0x0B9

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

Mean-

ing

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 0 b0110 0 0 010 0011101101110 01

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.

The Exponent is a value in excess 127. So, the Exponent value is 10.

The Mantissa is 11000010001110110111001 binary.

With the implied leading 1, the Mantissa is (1).C23B72 (hex).

The Floating Point Representation is therefore -1.75871956 times 2 to the 10.

Decimal equivalent: -1800.929

NOTES:

• Exponent = the whole number before the decimal point.

• Mantissa = the positive fraction after the decimal point.

1 2 ... 77 78 79 80 81 82 83 84 85 86 87 ... 93 94

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