70 Rockwell Automation Publication PFLEX-AP005B-EN-P - May 2019
Chapter 3 Network Communications
Velocity Reference/Feedback
The PowerFlex 700 Drive velocity reference and feedback data is represented as
scaled values, or a value of 32,767 equates to parameter 55 (Maximum Freq)
setting and a value of 0 equates to 0 Hz.
The PowerFlex 750-Series reference and feedback data are in engineering units
and are dependent on P300 (Speed Units). A reference of 30.0 equals 30 Hz or
30.0 rpm.
Using the I/O
The terms input and output are defined from the controller’s point of view.
Therefore, output I/O is data that is produced by the controller and consumed by
the adapter. Input I/O is status data that is produced by the adapter and
consumed as input by the controller. The I/O image will vary greatly dependent
of the communications adaptor and thus user should consult the ‘Using the I/O’
section of the respective I/O adaptor user manual.
16 Bit-based Processors (PLC-5)
The PowerFlex 750-Series drives are 32 bit-based whereas the PLC-5® is 16 bit.
Any application that may use a PLC5 with a PowerFlex 750-Series drives should
include a review to determine what data will be passed and if the PLC5 can
handle this data.
Refer to Rockwell Knowledgebase online document 65712
, Using 20-COMM
with PowerFlex 755 and 753 with a 16-bit controller, for further information.
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