Abstract
This chapter provides an introduction to the fundamental principles and terminology used in the field of supervisory control and data acquisition (SCADA) systems. SCADA encompasses the collecting of the information, transferring it back to the central site, carrying out any necessary analysis, and controlling and displaying that information on a number of operator screens or displays. The required control actions are then conveyed back to the process. A SCADA system consists of a number of remote terminal units (RTUs) collecting field data and sending that data back to a master station using a communication system. The master station displays the acquired data and allows the operator to perform remote control tasks. The accurate and timely data allows for optimization of the plant operation and process. The benefits include more efficient, reliable, and most importantly, safer operations and results in a lower cost of operation compared to earlier non-automated systems. It is suggested that when first planning and designing a SCADA system, consideration should be given to integrating new SCADA systems into existing communication networks, in order to avoid the substantial cost of setting up new infrastructure and communications facilities.
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