关于本计算器
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.
Modbus 寄存器与 IEEE 754 转换器
32位单精度浮点数解码、大小端字序交换 (ABCD, CDAB, BADC, DCBA)、PLC寻址与 CRC-16 校验。
IEEE 754 32位单精度浮点数与寄存器排序
·····
0x
Dec: 17142 | Signed: 17142
0x
Dec: 59769 | Signed: -5767
0x
Dec: 0 | Signed: 0
0x
Dec: 0 | Signed: 0
32位解码数值
IEEE 754 Float32
123.456001
单精度浮点数 (IEEE 754)
Signed Int32
1,123,477,881
Int16×2: 17142 / -5767
Unsigned UInt32
1,123,477,881
UInt16×2: 17142 / 59769
合并 32位十六进制
0x42F6E979
4 Bytes / 32 Bits
32位二进制格式：
01000010 11110110 11101001 01111001
字节的 ASCII 解读
B··y
IEEE 754 位域解析
符号位 (1 bit): 0 (+)
指数 (8 bit): 133 (含偏置 6)
尾数 (23 bit): 0x76E979
各寄存器明细
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 位解码值
Reg1–Reg4 · ABCDIEEE 754 Float64
403072211746816
双精度 (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
组合 64 位 Hex
0x42F6E97900000000
8 Bytes / 64 Bits
64 位二进制表示：
01000010 11110110 11101001 01111001 00000000 00000000 00000000 00000000
将数值编码写入寄存器
工程值 (raw × k + b)
Int32 × k + b
1123477881
常见问题
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.