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The Guide to PLC Hardware Components

This ebook provides a detailed investigation into the types, functions, and connections of each of the four primary components of a programmable logic controller (PLC).

Ebooks July 03, 2025 by Control.com

A programmable logic controller, or PLC, is an industrial computer specifically designed for factory automation and process control. PLCs receive signals from buttons and sensors, process these signals, and then provide the proper outputs.  This ebook examines the four key components of a PLC:

  1. The central processing unit (CPU).
  2. The power supply unit (PSU).
  3. Input/output (I/O) modules.
  4. Communication and networking ports.

Although each PLC has its own unique characteristics, this ebook will provide practical insights into the common elements that you are likely to find across all makes and models.

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