Since its first publication in 1992, "Programmable Logic Controllers: Principles and Applications" by John W. Webb and Ronald A. Reis has earned its place as a standard text in engineering technology education. It is a that has helped launch the careers of countless automation professionals. For anyone seeking a deep and practical understanding of PLCs, this book remains a powerful resource.
: The book covers everything from the internal architecture and hardware of a PLC to the intricacies of ladder logic diagrams and functional block programming. Step-by-Step Programming Since its first publication in 1992, "Programmable Logic
Ultimately, the book is designed to help readers understand main design characteristics, internal architecture, and operating principles, as well as identify safety issues and methods for fault diagnosis. It is a that has helped launch the
A PLC is useless if it can't "talk" to the world. Webb provides detailed insights into how sensors (inputs) and actuators (outputs) interface with the PLC’s internal circuitry. Step-by-Step Programming Ultimately, the book is designed to
A fundamental concept emphasized in the book is the sequential operation of the PLC, known as the scan cycle. This continuous process happens in milliseconds and follows three distinct steps:
Outputs include motor starters, solenoid valves, indicator lights, and variable frequency drives (VFDs).
The book excels at explaining the evolution from hard-wired relay logic to programmable logic. By drawing direct parallels between physical relay cabinets and the "virtual" relays inside a PLC, Webb demystifies the Ladder Diagram (LD) language. If you can understand an electrical schematic, this book ensures you can understand a PLC program.