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ATV21 / ATV212 ; How is the drive control switched between Local and Remote modes?

Issue:
ATV21 / ATV212 drives can run in Remote or Local modes.  How is control switched between the two modes?

Product line:
Altivar ATV21 and ATV212

Environment:
All models, all serial numbers

Cause:
None 

Resolution:
Pressing the LOC/REM button on the integral keypad will switch between Local and Remote modes.
In Local mode, RUN/STOP and speed is controlled by the keypad buttons.
In Remote mode, control is determined by the settings for FMOD (Frequency Mode Select) and CMOD (Command Mode Select).
When the green LED on the LOC/REM button is ON, the drive is in Local mode.
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