Control systems are tightly intertwined in our daily lives so much that we take them for granted. In the processing industry, controllers play a crucial role in keeping our plants running- virtually everything from simply filling up a storage tank to complex separation process and chemical reactors. Most of the applications of industrial process control used simple feedback loops which regulated flows, temperature, pressures, levels and the like. The use of advanced regulatory control has given benefits such as a simply closer control of the process.