An engineering professor at Grand Valley State University has made available his book on programmable logic controllers (PLC's), which are widely used to control all kinds of electrical devices. The 800+ page book is presented free of charge and can be downloaded in one large file or in individual chapters. Readers can learn everything from high-level concepts, like Boolean logic and operational design planning, to physical details such as PLC specifications and connectivity. The author explains different methods of programming PLC's and offers suggestions for selecting the right PLC for a particular application. The book is a work in progress, so a few "to do" notes are scattered throughout the text.
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