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This book provides a comprehensive introduction to programmable logic controllers and their applications. Summary Of The Book Programmable Logic Controllers (PLC) are special computers that are used to control machine operations. This book covers these devices and their usage, to provide a thorough understanding of the fundamentals. It also covers some advanced topics. Programmable Logic Controllers: Programming Methods and Applications explains how a PLC can be connected to other external systems in a control system. It focuses on relay ladder logic methods. The book begins by covering the Fundamentals of Ladder diagrams. It then devotes a chapter to providing an introduction to Programmable Logic Controllers including their history. This chapter also provides an overview of the basic PLC configuration. The third chapter covers the first steps in PLC programming and basic PLC programming techniques. The next chapter proceeds on to advanced PLC programming techniques. It covers flip-flops, sequencers, timers, and counters. The next two chapters cover mnemonic programming and wiring techniques. Then Programmable Logic Controllers: Programming Methods and Applications covers analog input/output, and discrete position sensors. The ninth chapter focuses on transducers, encoders, and advanced sensors. The tenth chapter covers closed loop control systems and also control systems using Proportional Integral Derivative (PID) systems. The next chapter covers motor controls. It focuses on AC and DC motor controls and variable speed AC motor drive. The twelfth chapter concentrates on system integrity and safety issues. This final chapter focuses on ensuring security measures. It covers system integrity, fail safe wiring and programming, safety interlocks, and equipment temperature considerations. The two appendix sections cover logic and industrial electric symbols. Programmable Logic Controllers: Programming Methods and Applications, in addition to providing a general coverage of PLC programming, also explains specific and advanced programming techniques. The book explains Logic Gates and Logic State Machines, along with illustrative examples. The coverage in the book also includes system integrity and safety measures. The book covers advanced machine control methods, and also explains PLC interfacing techniques. It uses many real world examples that demonstrate the power, capabilities and practical applications of PLCs. About John R. Hackworth John R. Hackworth is a professor and a writer. Other books by Hackworth - Fundamentals of Electrical Engineering and Technology (With CD), Supplement: Experiments for Principles of Electronic Devices - Principles of Electronic Devices, and Digital Signal Processing. He writes textbooks for engineering courses. John R. Hackworth earned his Electrical Engineering Bachelor's and Master's degrees from the Old Dominion University. He has close to two decades of industrial experience. After spending several years working in the industry, he joined the faculty of his alma mater. He is now Associate Professor at the Old Dominion University. He is also the Program Director for the Electrical Engineering technology courses at that institution.