Chapter 3_PLC Architecture

Chapter Objective:
This chapter provides an overview of the architecture of Programmable Logic Controllers (PLCs), highlighting their role in industrial automation. It introduces the main types of PLCs, their core components (such as signal, analog, communication, and interface modules), and their internal structure. The chapter also explains the operating principles, memory organization, and execution cycle, with a focus on Siemens Simatic S7 systems. By the end, students will understand how PLCs function and how their components work together to manage automated processes.