"PLC Applications in the Conventional Relay Control Systems and Simulation of a Complete Traction Cycle"

Abstract

In today's competitive world, a company must be efficient ,cost­ effective, and flexible if it wishes to survive. In the manufacturing and process industries, this has resulted in a greatly increased demand for industrial control system in order to streamline operations in terms of speed, reliability, versatility, and material throughput. All industrial processes need some form of control system to run safel y and economically. Established control media, including relay, logic, and computer system s, can provide effective control of industrial processes and plant. However, each of the above control media has limitation or disadvantages. In recent years a special control computer, called a programmable controller (PC) or programmable logic controller (PLC), has evolved, and revolutionized control engineering by combining computing power and immense flexibility at a reasonable cost. Th e present Thesis deals with a survey for the control systems in different forms especially in industry field shown in chapter one. Chapter two contains a review about the PLC including history, development, internal architecture, s1ze and types, choosing, commissioning of PLC, programming, system layout, input /output requirements and givi ng at last some application of using PLC