Modbus Tcp Address Map - GE PACSystems RXi User Manual

4.1.6

Modbus TCP Address Map

This read-only tab displays the standard mapping assignments between Modbus address
space and the CPU address space. Ethernet interfaces in the PACSystems controller use
Modbus-to-Controller address mapping based on this map.
Modbus Register
Start Address
End Address
Controller Memory
Address
Length
GFK-2816F
The Modbus protocol uses five reference table designations:
0xxxx Coil Table. Mapped to the %Q table in the CPU.
1xxxx Input Discrete Table. Mapped to the %I table in the CPU.
3xxxx Input Register Table. Mapped to the %AI register table in the CPU.
4xxxx Holding Register Table. Mapped to the %R table in the CPU.
6xxxx File Access Table. Mapped to the %W table in the CPU.
Lists the beginning address of the mapped region.
Lists the ending address of the mapped region. For word memory types (%AI, %R and %W)
the highest address available is configured on the Memory tab.
Lists the memory type of the mapped region.
Displays the length of the mapped region.
August 2015
Chapter 4. Configuration
45