primary operator interface is an Allen-Bradley 1000E Keypad Operator Interface
(O/I) mounted in the front door of the Main Control Panel. Operator
actions are accomplished by pressing keys on the O/I. The O/I presents
information on screens organized according to process function.
The O/I operator prompts appear at the bottom of every screen just above the lower function key titles. They command or suggest to the operator the next logical step for operating the filter press.