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
WORD
1 – bit 0 (STOP)
40301 bit 0
0301
FB
CMD
WORD
1 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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