Modbus Tcp Address Map - GE PACSystems RX7i Reference Manual

Chapter 3. CPU Configuration
Settings Parameters
Day Light RX3i CPE302/CPE305/CPE310/CPE330/CPE400 CPUs only. Activates Day Light Savings
Savings Time Time (DST) settings for the controller. Allows you to select appropriate local start and end
(DST) times for Day Light Savings Time.
Choices:
Disabled: Day Light Savings Time settings are not active.
Enabled: Day Light Savings Time settings are active and configurable.
Default: Disabled.

3.2.2 Modbus TCP Address Map

This read-only tab displays the standard mapping assignments between Modbus address space and the
CPU address space. Ethernet modules and daughterboards in the PACSystems controller use Modbus-
to-PLC address mapping based on this map.
Modbus The Modbus protocol uses five reference table designations:
Register
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.
PLC Memory Lists the memory type of the mapped region.
Length Displays the length of the mapped region.
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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.
PACSystems* RX7i, RX3i and RSTi-EP CPU Reference Manual GFK-2222AD