Modbus Register & IEEE 754 Converter

Decode 32-bit Float & Int values, swap endianness (ABCD, CDAB, BADC, DCBA), PDU offsets, and CRC-16.

IEEE 754 32-Bit Float & Register Reordering

·····

Dec: 17142 | Signed: 17142

Dec: 59769 | Signed: -5767

Dec: 0 | Signed: 0

Byte & Word Swapping Order

32-Bit Decoded Numerical Values

IEEE 754 Float32

123.456001

Single Precision (IEEE 754)

Signed Int32

1,123,477,881

Int16×2: 17142 / -5767

Unsigned UInt32

1,123,477,881

UInt16×2: 17142 / 59769

Raw 32-Bit Hex

0x42F6E979

4 Bytes / 32 Bits

32-Bit Binary Representation:

01000010 11110110 11101001 01111001

ASCII interpretation of bytes

B··y

IEEE 754 bit-field breakdown

Sign (1 bit): 0 (+)

Exponent (8 bit): 133 (biased 6)

Mantissa (23 bit): 0x76E979

Per-register details

Reg1: 0x42F6 = 17142 / 17142 · 01000010 11110110

Reg2: 0xE979 = 59769 / -5767 · 11101001 01111001

Reg3: 0x0000 = 0 / 0 · 00000000 00000000

Reg4: 0x0000 = 0 / 0 · 00000000 00000000

64-bit decoded values

Reg1–Reg4 · ABCD

IEEE 754 Float64

403072211746816

Double precision (IEEE 754)

Signed Int64

4,825,300,756,674,379,776

−2⁶³ … 2⁶³−1

Unsigned UInt64

4,825,300,756,674,379,776

0 … 2⁶⁴−1

Combined 64-bit Hex

0x42F6E97900000000

8 Bytes / 64 Bits

64-bit binary representation:

01000010 11110110 11101001 01111001 00000000 00000000 00000000 00000000

Encode value into registers

Value

Encode type

Engineering value (raw × k + b)

Factor k

Offset b

Int32 × k + b

1123477881

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About this calculator

Decode Modbus registers: IEEE 754 floats, 16/32/64-bit integers with ABCD/CDAB/BADC/DCBA byte orders, PLC address translation, RTU frame builder with CRC-16 and a full frame parser.

Frequently asked questions

What is Modbus RTU?

A serial protocol where a master reads and writes registers on slave devices; each request carries slave ID, function code, data and CRC-16.

Why is my float value wrong?

Almost always byte or word order: try CDAB (word swap, common on Schneider/Modicon) or DCBA/BADC before doubting the data.

What is a PDU offset?

The 0-based protocol address; vendors display it as 40001-style PLC addresses, and this tool converts both ways.