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Using the I/O
5-3
PowerFlex 750-Series Drive DeviceNet Option Module User Manual
Publication 750COM-UM002A-EN-P
Using Reference/Feedback
The Reference is a 32-bit REAL (floating point) piece of control data
produced by the controller and consumed by the Option Module. The
Feedback is a 32-bit REAL (floating point) piece of status data
produced by the Option Module and consumed by the controller.
The Reference and Feedback values represent engineering units. For
example, a 32-bit REAL Reference value of “30.0” equals a Reference
of 30.0 Hz. Note that the commanded maximum speed can never
exceed the value of drive Parameter 520 - [Max Fwd Speed].
shows example References and their results for a PowerFlex 750-Series
drive that has its Parameter 37 - [Maximum Freq] set to 130 Hz and
Parameter 520 - [Max Fwd Speed] set to 60 Hz.
When using a ControlLogix controller, the 32-bit REAL Reference
word is always DINT 1 in the output image and the 32-bit REAL
Feedback word is always DINT 1 in the input image. Because the I/O
image is integer-based and the Reference and Feedback are floating
point, a COP (Copy) instruction or UDDT is required to correctly write
values to the Reference and read values from the Feedback. See the
ladder logic program examples in
.
Table 5.B Example Speed Reference/Feedback Scaling for PowerFlex 750-Series
Drives
Network
Reference Value
Speed Command
Value
Output Speed
Network
Feedback Value
130.0
130 Hz
60 Hz
(2)
(2)
The drive runs at 60 Hz instead of 130 Hz or 65 Hz because drive Parameter 520 - [Max
Fwd Speed] sets 60 Hz as the maximum speed.
60.0
65.0
65 Hz
60.0
32.5
32.5 Hz
32.5 Hz
32.5
0.0
0 Hz
0 Hz
0.0
-32.5
(1)
(1)
The effects of values less than 0.0 depend on whether the PowerFlex 750-Series drive
uses a bipolar or unipolar direction mode. Refer to the drive User Manual for details.
32.5 Hz
32.5 Hz
32.5
Содержание PowerFlex 750-Series
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