GN-9289 User Manual
Page 29 of (70)
G-series GN-9289 Modbus TCP_UDP Rev. 1.01.docx
7.1.
MODBUS Interface Register/Bit Map
Register Map
Start Address
Read/Write
Description
Func. Code
0x0000 ~
Read
Process input image registers (Real Input Register)
3,4,23
0x0800 ~
Read/Write
Process output image registers (Real Output Register)
3,16,23
0x1000 *
Read
Adapter Identification special registers.
3,4,23
0x1020 *
Read/Write
Adapter Watchdog, other time special register.
3,4,6,16,23
0x1100 *
Read/Write
Adapter Information special registers.
3,4,6,16,23
0x2000 *
Read/Write
Expansion Slot Information special registers.
3,4,6,16,23
* The special register map must be accessed by read/write of every each address (one address).
Register Map
Start Address
Read/Write
Description
Func. Code
0x0000~
Read
Process input image bits
All input registers area are addressable by bit
address. Size of input image bit is size of input image
register * 16.
2
0x1000~
Read/Write
Process output image bits
All output registers area are addressable by bit address.
Size of output image bit is size of output image
register * 16.
1,5,15
