One of the most crucial decisions in the initial design phase of a process package or plant is the selection of the control system. First thing is to identify if there is any requirement for automating your process. If yes then the type of controls required to automate it. The challenges faced by today’s process industries have been multiplied by the volatile state of the global economy. In this type of environment the demands on the process control system are increased, going beyond simple regulatory functions. It becomes a tool to manage the plant, decrease energy consumption, reduce costs, cut emissions and provide quick and precise information from the field to support production and business decisions.