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 |
|
|
|
|
Coils | Read/Write | 0**** | 0000 to 0511 |
|
|
| 0512 to 4095 |
|
|
| 4096 to 5112 |
|
|
| 7936 to 8447 |
Input | Read only | 1**** | 0000 to 0511 |
Status |
|
| 0512 to 4095 |
|
|
|
|
Input | Read only | 3**** | 0000 to 0063 |
Register |
|
|
|
|
|
|
|
Holding | Read/Write | 4**** | 0000 to 0063 |
Registers |
|
| 0768 to 0831 |
|
|
| 1280 to 1311 |
|
|
| 3328 to 3455 |
|
|
| 3840 to 3967 |
|
|
| 4352 to 5887 |
Reg/Device
Y
R
Z
X
XW
YW
RW
ZW
T
C
D
Address (T2)
Y000 to Y31F
Y320 to Y63F
R000 to R63F
Z000 to Z31F
X000 to X31F
X320 to X63F
XW00 to XW63
YW00 to YW63 RW00 to RW63 ZW00 to ZW31 T000 to T127 C000 to C095 D000 to D1405
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