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How to scale values from 16 bit integers to floats with the AN-X2-AB-DHRIO gateway running the RIO DRV firmware

Article Number: 516 | Rating: Unrated | Last Updated: Mon, Aug 4, 2014 at 9:42 PM

When migrating an old 1305 or 1336 drive to a new PowerFlex 753 or PowerFlex 755 drive it is necessary to scale some of the parameters. When scaling from an integer to a float the following formula is used to generate a multiplier which is then inserted into the RioDef template file.

Formula:
New Scale Maximum Value and divide it by the current maximum scaled value

Example:
Output Frequency as an input to the PLC or SLC
Maximum in the drive is 650.00
Maximum in the PLC or SLC is 32767

32767/650 = 50.41
I:1 <- Feedback *50.41

Example:
Commanded Speed Reference as an input to the Drive
Maximum value in the drive is 13920
Maximum in the PLC or SLC is 32767

13920/32767 = .4248
O:1 *.4248 -> Reference

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