Operator Interfaces HMIs, GUIs
Human-Machine-Interfaces, or HMI's can greatly improve the efficiency of the controls by reducing the number of physical controls on the control panels. From basic text-based screens, to more elaborate colour touch-screens (which are generally referred to as Graphic-User-Interfaces, or GUI's), it is possible to obtain a lot more control and information about the running plant or process. They also provide a facility for adding security when accessing certain menus / plant information. Where GUI's are implemented, they can have a massive impact on the level of control over the plant.