What is the difference between Ref 1B switching and Ref 2 switching on the ATV61 and ATV71 drives?

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Issue:
Difference between Ref 1B switching and Ref 2 switching on the ATV61/71 drives.

Product Line:
Altivar ATV61 and ATV71 drives

Environment:
All

Cause:
Customer needs to know why do we have two reference switching on the ATV61 and ATV71 drives?

Resolution:
Ref 1 B switching will allow you to switch between Ref 1 channel in Menu 1.6 and Ref 1 B channel in Menu 1.7.
Ref 2 switching will allow you to switch between Ref 1 channel in menu 1.6 and Ref 2 channel in menu 1.6

See the attached programming manual for programming assistance on setting them up.