This section covers how PLCs handle data at the bit level, including digital logic applications, sequencer functions (often used in automated manufacturing), and specialized matrix functions for data comparison.
Beyond basic contacts, Webb and Reis emphasize advanced capabilities:
I/O modules utilize optoisolators to protect the delicate internal circuitry of the CPU from high-voltage electrical spikes in the field. 3. The Power Supply This section covers how PLCs handle data at
[Sensors / Inputs] ---> [ PLC (CPU & Memory) ] ---> [Actuators / Outputs] ^ | [HMI / SCADA Monitoring] Manufacturing and Assembly
| Week | Topics Covered | |------|----------------| | 1-2 | PLC overview, hardware architecture, I/O systems | | 3-4 | Basic programming, ladder logic fundamentals | | 5-6 | Timers, counters, internal relays | | 7-8 | Intermediate functions, data handling | | 9-10 | Advanced functions, PID control | | 11-12 | HMI, communication networks (Modbus, Profibus) | | 13-14 | System design, selection, installation | | 15 | Troubleshooting and maintenance | The Power Supply [Sensors / Inputs] ---> [
On Amazon.com, the 4th edition holds a solid rating with several detailed testimonials. One recurring theme is the book's appropriateness for readers with no prior PLC experience. A verified purchaser who used the book in their course wrote: "This practical and clearly written introduction provides both fundamental and cutting-edge coverage... It combines comprehensive, accessible coverage with a wealth of industry examples that make intangible concepts come to life".
The CPU is the brain of the controller. It executes the control program stored in its memory, performs arithmetic logic, and manages communication between components. 2. The Input/Output (I/O) System It combines comprehensive, accessible coverage with a wealth
"Programmable Logic Controllers: Principles and Applications" by John W. Webb and Ronald A. Reis (5th Edition) is a comprehensive textbook covering PLC hardware, Ladder Logic programming, and industrial applications. The text serves as a foundation for students and technicians, incorporating updated illustrations and a lab manual to support modern industrial automation concepts. Explore a preview of the text on Scribd .
Changing a production process required physically rewiring hundreds or thousands of relays.