A control system is a device, or set of devices, that
manages, commands, directs or regulates the behavior of other devices or
systems. Industrial control systems are used in industrial production for
controlling equipment or machines. There are two common classes of control
systems, open loop control systems and closed loop control systems. In open
loop control systems output is generated based on inputs. In closed loop
control systems current output is taken into consideration and corrections are
made based on feedback. A closed loop system is also called a feedback control
system. The human body is a classic example of feedback control system. Fuzzy
logic is also used in control systems.
