Objectives of Data Acquisition System: It must monitor the complete plant operation to maintain online optimum and safe operations. It must provide an effective human communication system and be able to identify problem areas, thereby minimizing unit availability and maximizing unit through point at minimum cost. It must be able to collect, summarize and store data for diagnosis of operation and record purpose It must be able to compute unit performance indices using online,real time data. It must be reliable, and not have a down time greater than 0.1%.