Ambient conditions (temperature, pressure, humidity, weather etc) and
feed (rate, composition, temperature and pressures)
Mechanical equipment (pumps, valves, compressors etc) and
internal conditions in the process (temperature, pressures etc)
Operator actions (setpoint changes, auto-manual switching, opening and closing of manual valves etc)
Control structure design (control loops, overall process control design )
Control Logic and Parametrization (function blocks and library, PID tuning parameters, timers, etc.)