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Modbus RTU On-Board Communications
POWERXL SERIES VFD MN040010EN—June 2018 www.eaton.com
Modbus registers
The variables and fault codes as well as the parameters can
be read and written from Modbus. The parameter addresses
are determined in the application. Every parameter and
actual value have been given an ID number in the application.
The ID numbering of the parameter as well as the parameter
ranges and steps can be found in the application manual
in question. The parameter value shall be given without
decimals.
All values can be read with function codes 3 and 4 (all
registers are 3X and 4X reference). Modbus registers are
mapped to drive IDs as follows.
Table 20. Index table
ID Modbus register Group R/W
1–98 40001–40098
(30001–30098)
Actual Values 1/1
100 40099 (30099)
Fault Code 1/1
101–1999 40101–41999
(30101–31999)
Parameters 1/1
2004–2011 42004–42011
(32004–32011)
Process Data In 1/1
2104–2111 42104– 42111
(32104–32111)
Process Data Out 1/1
Process data
The process data fields are used to control the drive (e.g.,
Run, Stop, Reference, Fault Reset) and to quickly read actual
values (e.g., Output frequency, Output current, Fault code).
The fields are structured as follows.
Table 21. Process data slave
master (max. 22 bytes)
ID Modbus register Group Range/Type
2101 32101, 42101
FB Status Word Binary coded
2102 32102, 42102
FB General Status Word Binary coded
2103 32103, 42103
FB Actual Speed 0–100.00%
2104 32104, 42104
FB Process Data Out 1
2105 32105, 42105
FB Process Data Out 2
2106 32106, 42106
FB Process Data Out 3
2107 32107, 42107
FB Process Data Out 4
2108 32108, 42108
FB Process Data Out 5
2109 32109, 42109
FB Process Data Out 6
2110 32110, 42110
FB Process Data Out 7
2111 32111, 42111
FB Process Data Out 8
Table 22. Process data master slave (max. 22 bytes)
ID Modbus register Group Range/Type
2001 32001, 42001
FB Control Word Binary coded
2002 32002, 42002
FB General Control Word Binary coded
2003 32003, 42003
FB Speed Reference 0–100.00% Hz
2004 32004, 42004
FB Process Data In 1 Integer 16
2005 32005, 42005
FB Process Data In 2 Integer 16
2006 32006, 42006
FB Process Data In 3 Integer 16
2007 32007, 42007
FB Process Data In 4 Integer 16
2008 32008, 42008
FB Process Data In 5 Integer 16
2009 32009, 42009
FB Process Data In 6 Integer 16
2010 32010, 42010
FB Process Data In 7 Integer 16
2011 32011, 42011
FB Process Data In 8 Integer 16
The use of process data depends on the application. In a
typical situation, the device is started and stopped with the
Control Word (CW) written by the Master and the Rotating
speed is set with Reference (REF). With PD1–PD8 the
device can be given other reference values (e.g., Torque
reference). With the Status Word (SW) read by the Master,
the status of the device can be seen. Actual Value (ACT) and
PD1–PD8 show the other actual values.
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