ACS550-02/U2 User’s Manual 227
Embedded fieldbus
Feedback from the drive – EFB
Pre-defined feedback
Inputs to the controller (drive outputs) have pre-defined meanings established by the
protocol. This feedback does not require drive configuration. The following table lists
a sample of feedback data. For a complete listing, see input word/point/object
listings in the technical data for the appropriate protocol starting on page 231.
Note: With Modbus, any parameter can be accessed using the format: “4” followed
by the parameter number.
Actual value scaling
The scaling of actual values can be protocol dependent. In general, for Actual
Values, scale the feedback integer using the parameter’s resolution. (See section
Complete parameter list on page 115 for parameter resolutions.) For example:
Where parameters are in percent, the Complete parameter descriptions section
specifies what parameter corresponds to 100%. In such cases, to convert from
percent to engineering units, multiply by the value of the parameter that defines
100% and divide by 100%.
Drive parameter
Modbus protocol reference
ABB DRV DCU PROFILE
0102 SPEED 40102
0103
OUTPUT FREQ 40103
0104
CURRENT 40104
0105
TORQUE 40105
0106
POWER 40106
0107
DC BUS VOLTAGE 40107
0109
OUTPUT VOLTAGE 40109
0301
FB CMD WORD1 – bit 0 (STOP) 40301 bit 0
0301
FB CMD WORD1 1 – bit 2 (REV) 40301 bit 2
0118
DI 1-3 STATUS – bit 0 (DI3) 40118
Feedback
integer
Parameter
resolution
(Feedback integer) · (Parameter resolution) = Scaled value
1 0.1 mA 1 · 0.1 mA = 0.1 mA
10 0.1% 10 · 0.1% = 1%
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