The LHMI is used for setting, monitoring and controlling.
5.5.1.1  Keypad
AMU0600428 v17
The LHMI keypad contains push-buttons which are used to navigate in different
views or menus. The push-buttons are also used to acknowledge alarms, reset
indications, provide help and switch between local and remote control mode.
The keypad also contains programmable push-buttons that can be configured either
as menu shortcut or control buttons.
1MRK 505 394-UEN A Section 5
Local Human-Machine-Interface LHMI
Line differential protection RED650 2.2 IEC 67
Technical manual