Data Addressing; Pdu/Rpp/Rpm Unit Id Numbers - Eaton Power Xpert 1000 Series User Manual

MODBUS REGISTERS

PDU/RPP/RPM Unit ID Numbers

62 EATON Power Xpert

Data Addressing

The register addresses and sizes listed in Table 3 through Table 9,
starting on page 66, specify an address for each entry. If a data type
spans multiple registers (such as a FLOAT), lower addressed registers
map to higher-order parts of the value. Within each register, data is in
most significant bit (MSB) first format.
NOTE A Modbus register contains two bytes. Therefore, the number of registers
containing the information can be obtained by dividing the bytes by two. For example, the
vendor name in Table 3 on page 66 can be obtained by reading 32 Modbus registers starting
at register 1032.
NOTE If a register is not supported in a particular device, an exception response is
returned.
Because the PDU/RPP/RPM consists of several panels of circuit
breakers, set the Unit ID in the Modbus program to specify a specific
PDU/RPP/RPM, a specific panel, or a specific breaker (see Table 2).
The PDU/RPP/RPM has a Unit ID of 0, 1, or 255. The same information
can be obtained from any of these IDs. See "PDU/RPP/RPM Registers
and Alarms" on page 65 for more information.
The panel Unit IDs range from 2 to 17. These summary data panel
registers contain the total information for all the breakers in a specific
panel. For example, the registers show the sum total current for each
phase distributed by all the breakers. See "Panel Registers and Alarms"
on page 68 for more information.
The breaker Unit IDs range from 18 to 33. These registers provide
individual breaker data for the specified panel. See "Breaker Data and
Alarms" on page 71 for more information on identifying specific breaker
registers.
NOTE Selecting panel and breaker Unit IDs that are not available will return an error code.
Currently available PDU/RPP/RPM model configurations are limited to eight panels, so only
eight panel Unit IDs are used. Future models may be configured for up to 16 panels.
If there is an optional Powerware Environmental Monitoring Probe
(EMP) installed, use Unit ID 254 to obtain EMP data. See "EMP (FC 04)"
on page 74 for more information.
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