Modbus Tcp Address Map - Emerson PACSystems RX3i User Manual

PACSystems™ RX3i and RSTi-EP CPU Reference Manual
GFK-2222AK
Settings Parameters
Enable UTC RX3i CPE302/CPE305/CPE310/CPE330/CPE400/CPL410 CPUs only.
Offset Activates Coordinated Universal Time (UTC) settings for the controller. Allows you to
select an appropriate local time zone with respect to UTC.
Choices:
Disabled: UTC settings are not active.
Enabled: UTC settings are active and configurable.
Default: Disabled.
Day Light RX3i CPE302/CPE305/CPE310/CPE330/CPE400/CPL410 CPUs only.
Savings Time Activates Day Light Savings Time (DST) settings for the controller. Allows you to select
(DST) appropriate local start and end 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.
CPU Configuration
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.
Section 3
October 2019
50