Industrial Automation generally refers to the science and technology of process control and includes the control of chemical and petrochemical plants, Oil refineries, iron and steel plant, Power plants, cement mills, Paper pulp and paper mills water and waste water treatment plants and many other sectors. The basic objective of automation is identifying the information flow and manipulates the material and energy flow as given process in a desired way. PLC, SCADA, VFD and HMI plays an important role in automating industrial system.