In industrial control a wide number of process variables such as temperature, flow, pressure, distance, and liquid levels can be sensed simultaneously. All these variables are acquired, processed and controlled by complex microprocessor systems or PC based data processing controllers.
Control systems are the essential parts of an automation system. The various types of closed loop control techniques ensure the process variables to follow the set points. In addition to this basic function, automation system employs different other functions such as computing set points for control systems, plant start up or shutdown, monitoring system performance, equipment scheduling, etc. The control systems along with monitoring adapted to the operating environment in an industry for flexible, efficient and reliable production system.