To control an ATV71 from the Keypad, we have to set Ref.1 Channel [Fr1] in the command menu [CtL] to HMI [LCC].

It is also possible to assign F1.. F4 Keypad Key to [T/K] terminal/keypad.
Once assigned, pressing this key will make the command from keypad.

Refer to attached file for the Fr1 and F1..F4 key assignment parameter.