Modbus Registers - Eaton Power Xpert 1000 Series User Manual

Chapter 6
EATON Power Xpert
® Gateway Series 1000 Card User's Guide

Modbus Registers

This chapter describes how to address a specific Power Distribution Unit
(PDU), Remote Power Panel (RPP) or Power Rack Module (RPM), a
specific panel in a PDU, RPP, or RPM, and a specific breaker in a panel
using Modbus TCP/IP.
NOTE To obtain the panel or circuit breaker data, the PDU/RPP/RPM must have the Energy
Management System (EMS) Level 3 option installed.
A PDU/RPP/RPM distributes power through one or more circuit breaker
panels. Each panel consists of several circuit breakers. Each circuit
breaker contains more than 30 parameters, such as voltage, current,
power, and alarms. The value of each parameter is stored in a
corresponding Modbus data register.
Because there are many panels in a PDU/RPP/RPM, it is necessary to
identify a specific breaker and specify the panel containing that breaker.
It is likely that Breaker #5 in Panel #1 has different data than Breaker #5
in Panel #7.
The tables in this chapter list sample names of the PDU/RPP/RPM
parameters and their corresponding Modbus registers for:
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PDU/RPP/RPM summary data
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Panel summary data
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Breaker data
The values of the parameters can be read over an Ethernet network by
using Modbus TCP/IP building monitoring programs or Modbus TCP/IP
analyzer programs.
NOTE Some Modbus programs provide an option for zero- or one-based addressing. Select
the option for zero-based addressing. The Modbus numbering scheme for the PDU/RPP/RPM
starts at 0, so physical coil number 1 corresponds to Modbus register number 0, coil number 2
corresponds to Modbus register number 1, and so on.
NOTE If your Modbus program requires one-based addressing, add a one to the register
addresses listed in Table 3 on page 66. For example, one-based addressing for the vendor
name would be 1033 (1032 + 1).
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