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Automation is the use of various control systems for operating equipment such as machinery, processes in factories,boilers and heat treating ovens, switching on telephone networks,steering and stabilization of ships,aircraft and other applications with minimal or reduced human intervention. Some processes have been completely automated.With automation throughput or productivity can be increased, Improved quality or increased predictability of quality,increased consistency of output can be obtained. Automation can be achieved with some controllers one is programmable logic controller (PLC). The PLC is an industrial computer. The PLC controls the industrial machines and processes. PLC shave more advantages compared to microcontrollers and personal computers. In different areas of the industry PLC are being applied,e.g.:materials handling,packaging,palletizing, milling,boring,grinding,filling,sorting,weighing.Hence nowadays all industries are preferring PLCs over other controlling equipment.