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5.2. Modbus Data Types and T2 Register Mapping
This table shows how the different Modbus data types are mapped into T2 registers. In other
words, a Modbus master would reference the following Modbus register ranges to access the
corresponding T2 PLC registers.
For example, Modbus Holding Register 4352 will map to T2 register D000, and Input Register
0000 will map to XW00.
Data Type
Attribute Modbus No. Offset Reg/Device Address (T2)
Coils
Read/Write 0**** 0000 to 0511
0512 to 4095
4096 to 5112
7936 to 8447
Y
R
Z
Y000 to Y31F
Y320 to Y63F
R000 to R63F
Z000 to Z31F
Input
Status
Read only 1**** 0000 to 0511
0512 to 4095
X X000 to X31F
X320 to X63F
Input
Register
Read only 3**** 0000 to 0063 XW XW00 to XW63
Holding
Registers
Read/Write 4**** 0000 to 0063
0768 to 0831
1280 to 1311
3328 to 3455
3840 to 3967
4352 to 5887
YW
RW
ZW
T
C
D
YW00 to YW63
RW00 to RW63
ZW00 to ZW31
T000 to T127
C000 to C095
D000 to D1405