Programmable controllers控制工程网版权所有, 4th Edition teaches the fundamental principles of programmable controllers for process and machine control in a clear and concise manner. This applications-based book was written by Thomas A. Hughes and has been used as a textbook for programmable logic controller (PLC) coursesCONTROL ENGINEERING China版权所有, and as a self study guide and resource for thousands of technicians and engineers. The fourth edition includes increased coverage of all five standard PLC programming languages—Ladder Diagram, Function Block DiagramCONTROL ENGINEERING China版权所有, Sequential Function Chart, Instruction List, and Structured Text—and the addition of numerous programming applications and examples clearly explain each language.