Programmable Logic Controllers: An Emphasis on Design and Application author: Kelvin T. Erickson rating: asin: 0976625903 binding: Hardcover list price: $100.00 USD amazon price: $100.00 USD

Jeremy Pollard at Control Design Magazine gives this book a glowing review . That's good enough for me to add it to our recommended reading list.

Programmable Logic Controllers author: Frank D. Petruzella rating: asin: 0078298520 binding: Hardcover amazon price: $121.00 USD

I really like this book.  The text discusses PLCs in a general sense even though the examples and exercises use the Allen Bradley line of PLC-5, SLC-500 and ControlLogix PLCs extensively.  So if you are student seeking to gain a good working knowledge of one of the most popular PLCs on the market then this is your book.  It deals very thoroughly in a basic and intermediate level, touching on some advanced concepts as well.  Some nice extra material not found in other books is chapter 13 on PLC Installation Practices, Editing and Troubleshooting.    The b