Instructions

Basic Operation 26
Doc: HMSI-27-314, Rev. 3.10Anybus Communicator EtherNet/IP / Modbus-TCP User Manual
2.5.4 Modbus Addressing Mode
Supported Function Codes
The following function codes can be used in this mode:
Input Register Map
The input data area is mapped to input registers as follows:
Holding Register Map
The output data area is mapped to holding registers as follows:
Modbus Function Function Code Associated with Area No. of I/Os or Data Points per Command
Read Holding Registers 3 Output Data area
(0x200...0x3FF)
1 - 125 registers
Read Input Registers 4 Input Data area
(0x000....0x1FF)
1 - 125 registers
Write Single Register 6 Output Data area
(0x200...0x3FF)
1 register
Force Multiple Registers 16 1 - 800 registers
Mask Write Register 22 1 register
Read/Write Registers 23 125 registers read / 100 registers write
Register # Memory Location in the gateway Comments
1 0x000... 0x001 Each register corresponds to two bytes in the input
data area.
2 0x002... 0x003
3 0x004... 0x005
4 0x006... 0x007
5 0x008... 0x009
6 0x00A... 0x00B
... ...
255 0x1FC... 0x1FD
256 0x1FE... 0x1FF
Register # Memory Location in the gateway Comments
1 0x200... 0x201 Each register corresponds to two bytes in the out-
put data area.
2 0x202... 0x203
3 0x204... 0x205
4 0x206... 0x207
5 0x208... 0x209
6 0x20A... 0x20B
... ...
255 0x3FC... 0x3FD
256 0x3FE... 0x3FF