156 ACS550 User’s Manual
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 160.
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 "Complete
Parameter List for ACS550" section 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 FREQ OUTPUT 40103
0104 CURRENT 40104
0105 TORQUE 40105
0106 POWER 40106
0107 DC BUS VOLT 40107
0109 OUTPUT VOLTAGE 40109
0301 FB STATUS WORD – bit 0 (STOP) 40301 bit 0
0301 FB STATUS WORD – bit 2 (REV) 40301 bit 2
0118 DI1-3 STATUS – bit 1 (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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