Rockwell Automation Publication 750-RM003A-EN-P - April 2018 81
Communication Configuration Chapter 3
Scaling of Reference and Feedback
The PowerFlex 700AFE bus supply parameters for DC bus voltage ‘Reference’
and ‘Feedback’ tag data are in scaled engineering units x 10. A Logix tag value
of 6000 written to the 16-bit predefined output Datalink will produce an
internal value of 6000 and parameter P061 [DC Volt Ref] value displayed as
600.0V.
The PowerFlex 755TM bus supply DC bus voltage ‘Reference’ and ‘Feedback’
tag data are in engineering units. A Logix tag value of 600.0 written to a 32-bit
predefined output Datalink will produce a parameter 13: P48 [DC BusRef
Preset] value of 600.0V.
PowerFlex 700AFE DPI Communications
The PowerFlex 700AFE bus supply supports 16-bit [INT] and 32-bit [DINT]
Datalinks, which can be selected on the Logix module definition screen (for
details, see the communication adapter documentation). The PowerFlex
700AFE with 20-COMM-X communication option module supports 8 input
and 8 output 16-bit Datalinks. If a 32-bit parameter is assigned to a Datalink, it
consumes two contiguous 16-bit Datalinks. When using Logix V16 and later,
PowerFlex 700AFE internal parameter values and Logix Datalink tags
automatically have the same data type and scaling factor.
Figure 22
shows the Module Definition dialog box for a PowerFlex 700AFE
bus supply with 20-COMM-E EtherNet/IP adapter using a 32-bit parameter
(A1/A2) along with two 16-bit parameters (B1 and B2) on the Input and two
16-bit parameters (A1 and A2) on the Output.
Figure 22 - Module Definition
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