51401570-100 keyboard interface electronics replaced the 51400972-100, as the second low-power keyboard interface introduced by Honeywell. It can be used with either an 'ABCDE' (51400756-100) or 'QWERTY' (51401560-100) membrane section.

51401570-100 combined with 51400756-100 is the original 'ABCDE' membrane section of the keyboard used in Honeywell's Universal Station. The membrane portion of the keyboard is RFKB - Relegendable Function Key Panel - with alarmable function keys. The 51400756-100 module is a membrane key panel consisting of 79 user-relegendable membrane function keys, plus 1 membrane key which is used for an LED test function. Western Process Computers uses newly made membranes for this application.

The Operator Keyboard provides access to the TPS system functionality, controlled by the level of access allowed by the keyswitch setting: