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Modbus Integrator's Guide for the Cordex® CXC HP Controller | 3 - Using Modbus

3.3. Modbus data

There are two types of data available over Modbus: limited data set and a full system data set for the DC

system and each AMPS HP2 modular inverter system.

3.3.1. Limited data set

The Limited Data Set has a small number of DC system related parameters. This data set uses only the

input registers table (04). The default Limited Data Set Device ID is 247. For a list of available data refer

to the Limited data set data points section.

3.3.2. Full system data set

A full system data set is available for the DC system and each AMPS HP2 modular inverter system. This

data set has all parameters related to the system as well as other data such as custom, data, timers,

counters, and ADIO readings. Three Modbus registers are used: coils status (01), input status (02), input

The structure of a full system data set is much different than for the Limited Data Set. When working with

the controller, it is possible to create and remove inventory to match a physical system, or to create and

remove things like user alarms, custom data, timers, and counters. Because of this dynamic nature there

are limits to the number of item that can be assigned Modbus addresses.

The data available for each device ID always includes controller data. The following tables show the types

of data contained in the Modbus table, the starting address for each type of data, and the limitation to the

number of data supported. Note that system data always starts at address 5001.

Table 3-2 Modbus address allocation for common controller data

Source Maximum num-

ber of source

items

Start of coil sta-

tus register (01)

Start of input

status register

(02)

Start of values

Controller 1 1 10001 30001

Custom Data 128 203 10203 30203

Timers 128 717 10717 30717

Counters 128 1231 11231 31231

User alarms 64 1745 11745 31745

reserved 1 2003 12003 32003

ADIO 24 3541 13541 33541

0350114-J0 Rev N Page 11

EnerSys Alpha Cordex CXC HP Integrator Guide

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