Chapter Two automatic Control 23. Open Loop Control Open loop control is a very simple control mode, in which there is no any feedback function between controller and controlled objective, ie, control is not affected by output. As it is shown in the figure input control output controller objective Open Loop Control System2.3. Open Loop Control Open loop control is a very simple control mode, in which there is no any feedback function between controller and controlled objective, ie, control is not affected by output. As it is shown in the Figure. input control output controller objective Open Loop Control System Chapter Two Automatic Control