This newly revised edition of Programmable Controllers discusses all phases of programmable controller applications from systems design and programming to installation, maintenance, and start-up. Used as a resource by thousands of technicians and engineers, this applications-based book provides a clear and concise presentation of the fundamental principles of programmable controllers for process and machine control. Increased coverage of all five standard PLC programming languages - Ladder Diagram, Function Block Diagram, Sequential Function Chart, Instruction List, and Structured Text a and the addition of numerous programming applications and examples clearly explain each programming language.