Building a Programmable Logic Controller with a PIC16F648A Microcontroller (Hardcover)

Programmable logic controllers (PLCs) are extensively used in industry to perform automation tasks, with manufacturers offering a variety of PLCs that differ in functions, program memories, and the number of inputs/outputs (I/O). Not surprisingly, the design and implementation of these PLCs have long been a secret of manufacturers. Unveiling the mysteries of PLC technology, Building a Programmable Logic Controller with PIC16F648A Microcontroller explains how to design and use a PIC16F648A-microcontroller-based PLC.

The author first described a microcontroller-based implementation of a PLC in a series of articles published in Electronics World magazine between 2008 and 2010. This book is based on an improved version of the project, including:

• Updates to the hardware configuration, with a smaller CPU board and two I/O extension boards that now support 16 inputs and 16 outputs instead of 8
• An increased clock frequency of 20 MHz
• Improvements to several macros
• Flowcharts to help you understand the macros (functions)

In this book, the author provides detailed explanations of hardware and software structures. He also describes PIC Assembly macros for all basic PLC functions, which are illustrated with numerous examples and flowcharts. An accompanying CD contains source files (.ASM) and object files (.HEX) for all of the examples in the book. It also supplies printed circuit board (PCB) (Gerber and .pdf) files so that you can have the CPU board and I/O extension boards produced by a PCB manufacturer or produce your own boards.

Making PLCs more easily accessible, this unique book is written for advanced students, practicing engineers, and hobbyists who want to learn how to build their own microcontroller-based PLC. It assumes some previous knowledge of digital logic design, microcontrollers, and PLCs, as well as familiarity with the PIC16F series of microcontrollers and writing programs using PIC Assembly language within an MPLAB integrated development environment.

可程式邏輯控制器（PLC）在工業中被廣泛用於執行自動化任務，製造商提供各種不同功能、程式記憶體和輸入/輸出（I/O）數量的PLC。毫不奇怪，這些PLC的設計和實施長期以來一直是製造商的秘密。《使用PIC16F648A微控制器建立可程式邏輯控制器》揭示了PLC技術的奧秘，並解釋了如何設計和使用基於PIC16F648A微控制器的PLC。

作者首先在2008年至2010年期間在《Electronics World》雜誌上發表的一系列文章中描述了基於微控制器的PLC的實現。本書基於該項目的改進版本，包括：

- 硬體配置的更新，使用更小的CPU板和兩個I/O擴展板，現在支持16個輸入和16個輸出，而不是8個
- 增加的時鐘頻率為20 MHz
- 對多個宏進行了改進
- 使用流程圖幫助理解宏（功能）

在本書中，作者詳細解釋了硬體和軟體結構。他還描述了所有基本PLC功能的PIC組合語言宏，並通過眾多示例和流程圖進行了說明。附帶的光碟包含了本書中所有示例的源文件（.ASM）和目標文件（.HEX）。它還提供了印刷電路板（PCB）（Gerber和.pdf）文件，以便您可以通過PCB製造商製作CPU板和I/O擴展板，或者自己製作板子。

這本獨特的書使PLC更容易接觸，適合高級學生、實踐工程師和愛好者，他們想要學習如何建立自己的基於微控制器的PLC。它假設讀者具有一些關於數位邏輯設計、微控制器和PLC的先備知識，並熟悉使用MPLAB集成開發環境內的PIC16F系列微控制器和撰寫PIC組合語言程序。