GE PACSystems RXi User Manual

Chapter 4. ConfigurationGFK-2816F August 2015 454.1.6 Modbus TCP Address MapThis read-only tab displays the standard mapping assignments between Modbus addressspace and the CPU address space. Ethernet interfaces in the PACSystems controller useModbus-to-Controller address mapping based on this map.Modbus Register 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.Start Address Lists the beginning address of the mapped region.End Address 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.Controller MemoryAddressLists the memory type of the mapped region.Length Displays the length of the mapped region.