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Is it possible to use 3 different control channels 1) Comm. 2) HMI (Graphic Keypad) 3) Terminal for controlling the Altivar 71

The 3 different control channels 1) Communication 2) HMI (Graphic Keypad)  and 3) Terminal for controlling the Altivar 71 Drive can be achieved by way of drive parameter programming. 
Example Programming:

FR1 = Modbus
RFC = LIx (to switch from FR1 to FR2).
FR2 = Term (Terminal)
Fx key assignment = T/K (to switch between the actual channel to the HMI)

Only one channel can control the drive at any given point. Control can be switched between one control channel to other.
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