Instruct: Classify an Amazon review as either positive or negative.
Query: Programmable Controllers Using the Allen-Bradley SlC-500 Family (2nd Edition) (Paperback)

IMHO one of the best books on the market if you want to learn and understand Allen-Bradley PLC controllers.A lot of other books are similar to the reference books that you can download for Allen-Bradley site for free.This one actually teaches you programming and also gives you deeper insight in wiring and cabinet layout, and many other related features.Recommended to co-workers (engineers). They find it very useful too.Would definitely recomment - worth the hefty price sticker.