Default Configuration
The default mapping is shown in the following table:
Modbus areas | Modbus address | ADS area | |
|---|---|---|---|
Digital inputs | 0x8000 - 0x80FF | Name of the variables in the PLC program | Data type |
GVL.mb_Input_Coils | ARRAY [0..255] OF BOOL | ||
Digital outputs (coils) | 0x8000 - 0x80FF | Name of the variables in the PLC program | Data type |
GVL.mb_Output_Coils | ARRAY [0..255] OF BOOL | ||
Input registers | 0x8000 - 0x80FF | Name of the variables in the PLC program | Data type |
GVL.mb_Input_Registers | ARRAY [0..255] OF WORD | ||
Output registers | 0x3000 - 0x5FFF
| 0x4020 - PLC memory area | 0x0 |
0x6000 - 0x7FFF | 0x4040 - PLC data area | 0x0 | |
0x8000 - 0x80FF | Name of the variables in the PLC program | Data type | |
GVL.mb_Output_Registers | ARRAY [0..255] OF WORD | ||
The server maps the individuals ADS areas and enables the access to the physical process image and maps the PLC data area.
The mapping can be adjusted by the TwinCAT Modbus TCP Configurator.