Rockwell Automation 7763 Medium Voltage OneGear SMC Flex Motor Controller (10-15 kV) - Manual (Page 94)

94 Rockwell Automation Publication 7760-UM001D-EN-P - October 2014
Chapter 7 Communications
Scale Factors for PLC
Communication The parameter values stored and produced by the SMC Flex through
communication are unscaled numbers. When reading or writing values from a
PLC image table, it is important to apply the proper scaling factor, which is based
on the number of decimal places.
Read Example
Parameter 11; Power Factor — The stored value is 85. Since this value has two
decimal places, the value should be divided by 100. The correctly read value is
0.85.
Write Example
Parameter 46; Motor FLC — The value which is to be written to the SMC is 75
A. Since this value has one decimal place, the value should be multiplied by 10.
The correctly written value is 750.
Display Text Unit Equivalents Some parameters have text descriptions when viewed from a HIM or through a
communication software program such as RSNetworx™. When receiving or
sending information from a PLC each text description has a numerical
equivalent.
Table 34 has an example of Parameter 44, Overload Class, and the
appropriate relationship between the text descriptor and the equivalent value.
This relationship is identical for other similar parameters located in Appendix B.
Table 34 - Display Text Unit Equivalents
Text Descriptor Numerical Equivalent
Disabled 0
Class 10 1
Class 15 2
Class 20 3
Class 30 4