Eaton Pow-R-Command 1000 BCB Manual

Effective October 2012
Supersedes August 2006
Instructional Leaet IL01412009E
Pow-R-Command™ 1000—
breaker control bus communication protocol
Introduction
Eaton’s Breaker Control Bus (BCB) communicates
using a sub-set of the Modbus®protocol.
This protocol is intended to provide a simple
mechanism for systems integrators and OEM
applications to communicate with Eaton
rail drivers. Consult the Modbus protocol
specification (http://www.modbus.org) for
more detailed information on the protocol.
The rail drivers communicate over a multi-drop
twisted pair RS-485 network using RTU formatted
messages at 9600 baud, no parity, 8 data bits,
and 1 stop bit. The maximum packet size including
addressing and CRC is 80 bytes.
Up to 16 Eaton BCBs can be connected to a single
network. Each BCB must have a unique address
from 1 to 16. The address is set with DIP switches
on the BCB itself. Table 1 shows the DIP switch
settings for each address.
Table 1. Device/Settings
Device Address DIP Switch Settings
1 00000001
2 00000010
3 00000011
4 00000100
5 00000101
6 00000110
7 00000111
8 00001000
9 00001001
10 00001010
11 00001011
12 00001100
13 00001101
14 00001110
15 00001111
16 00010000
Up to 21 EATON BABRSP or GHQRSP-series
remotely operated circuit breakers can be
connected to each BCB. Each breaker is
referenced through a Modbus output coil
register. The first breaker is located nearest
the controller as indicated on Figure 1.
Breaker control bus
Breaker 2 (Coil 1)
Breaker 1 (Coil 0)
Breaker 21 (Coil 20)
Figure 1. Modbus Output Coil Register
The following Modbus commands are processed
by the Eaton BCB.
Table 2. Modbus Commands
Command Definition Function
2 (0 x 02 hex) Read 1X Registers Read breaker feedback
status, presence, last
command, and alarm
5 (0 x 05 hex) Write Single Coil Force breaker on/off
17 (0 x 11 hex) Report Slave ID Read rail driver information
65 (0 x 41 hex) Device-Specific Eaton-specific commands
(e.g., Device Reset)
The Eaton BCB rails must be powered from
29 Vac control transformer rated at 96 VA. Consult
the BCB Installation Manual for more information.

Eaton Corporation
Electrical Sector
1111 Superior Avenue
Cleveland, OH 44114 USA
Eaton.com
© 2012 Eaton Corporation
All Rights Reserved
Printed in USA
Publication No. IL01412009E / Z12153
October 2012
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of Eaton Corporation.
All other trademarks are property
of their respective owners.
Instructional Leaet IL01412009E
Effective October 2012
Pow-R-Command™ 1000—
breaker control bus communication protocol
Function 02 (0 x 02) Read Discrete Inputs
(Feedback Status, Presence, Last Command,
and Alarm)
This function is used to read status of discrete inputs in a remote
device, also known as the 1X space. The request PDU specifies
the starting address and the number of inputs to read. In the PDU,
inputs are addressed starting at zero.
In the case of Eaton rail devices, the starting input number must be
a multiple of 8, and the byte count field must also be a multiple of 8.
Inputs 0 through 20 return the breaker feedback status. A value of 0
indicates that the breaker is off, and a value of 1 indicates that the
breaker is on.
Inputs 64 through 84 return the breaker commanded state last
written to using the write single coil function (0 x 05). A value of
0 indicates that the breaker is commanded off, and a value of 1
indicates that the breaker is commanded on.
Inputs 128 through 148 return the breaker presence status. A value
of 0 indicates that no breaker was detected at the given position, and
a value of 1 indicates that a breaker was detected at this position.
Inputs 192 though 212 return the breaker alarm status. A value of
0 indicates that breaker status is correct, and a value of 1 indicates
that a breaker status is in the alarm mode (feedback status is
different from commanded state).
Broadcast is not supported.
Table 3. Read Breaker Feedback Status, Presence,
Last Command, and Alarm
Request Command
FUNCTION ADDRESS HI ADDRESS LO COUNT HI COUNT LO
0 x 02 0 x 00 (Multiple of 8) 0 x 00 (Multiple of 8)
Response Command
FUNCTION BYTE COUNT INPUT STATUS 8-1 INPUT STATUS 16-9 Etc.
Function 05 (0 x 05) Write Single Coil
(Command Breaker ON/OFF)
This function is used to write a single breaker output to either on
or off in a remote rail. The request PDU specifies the address of
the breaker to be forced. Breakers are addressed starting at zero.
Therefore breaker number 1 is addressed as 0. The requested on/off
state is specified by a constant in the request data field. A value of
FF 00 hex requests the breaker to be on. A value of 00 00 requests
it to be off. All other values are illegal and will not affect the output.
Broadcast is not supported.
Table 4. Force Breaker ON/OFF
Request Command
FUNCTION ADDRESS HI ADDRESS LO VALUE HI VALUE LO
0 x 05 0 x 00 0 x 00 through
0 x 14
0 x 00 or 0 x FF 0 x 00
Response Command
FUNCTION ADDRESS HI ADDRESS LO VALUE HI VALUE LO
Function 17 (0 x 11) Report Slave ID
This function is used to read the description of the type, the current
status, and other information specific to a remote device. The data
contents are specific to each type of device.
Broadcast is not supported.
Table 5. Read Rail Driver Information
Request Command
FUNCTION
0 x 11
Response Command
FUNCTION BYTE COUNT SLAVE ID RUN STATUS EXTENDED DATA
The slave ID value returned is 0 x 01 for Eaton rail drivers.
The run status always returns a 0 x FF indicating that the device
is functional.
The extended data section has the following format.
Table 6. Extended Data Section
Bytes Format
Byte 1 Firmware Rev Major
Byte 2 Firmware Rev Minor
Byte 3 DIP Switch Settings 8 – 1
Bytes 4 to end Remaining Bytes are Reserved
Function 65 (0 x 41) Device-Specic
Commands (Restart)
This function is used to perform commands specific to the Eaton
rail driver. Sub-function 4 (0 x 04) is used to reset the rail device.
The data bytes must be exactly as specified below in order to
restart the device.
Broadcast is not supported.
Table 7. Eaton Specific Commands
FUNCTION SUB-FUNCTION DATA BYTES
0 x 41 0 x 04 0 x 00, 0 x 52, 0 x 41, 0 x 49, 0 x 4c, 0 x 52
ote:N There is no response to the Restart command.