Hailed as the most comprehensive introduction to PLCs on the market today, this newly updated 5th Edition covers theory, hardware, instructions, programming, installation, startup, and troubleshooting in a way that is easy to understand and apply. New material has been added to explain communication networks, basic control signals, linear scaling of analog process signals, and Proportional Integral Derivative (PID) instructions used by many PLC applications. Supplementary programming examples utilizing the PLC instructions in the book impart a better understanding of the various instructions and how they can be combined to create simple yet effective control logic solutions for today"s world.