What it is
The ABB 3ADT220071R0200 is a control panel keypad from the HMI Keyads & Keyboards line, listed under ASEA BROWN BOVERI and catalogued as a Human Machine Interface device for PLCs & HMIs panels. Its job is operator input at the panel face — pushbutton or key-switch actuation alongside an HMI station, not the display itself.
Class context
An HMI keypad in this ABB line sits next to the HMI display on the cabinet door or operator station, wired back to the controller for operator commands, mode selects, or acknowledgement functions typical of an HMI panel stack.