[.ca] Programming PLCs Using Rockwell Automation Controllers (ISBN 013094002X)

Good, not great:
Like others, I recommend this to be a part of the library in any maintenance and engineering department that is responsible for Rockwell-based automation systems. It's a good overview and should be helpful in a mixed environment. It is not a textbook and advanced programming techniques but should help you understand the use of data files, file instructions, indirect addressing, IO structure and data structures. There is probably never going to be a single book that covers the whole gambit, but this is about as close as you are likely to get with the AB platforms.

Good, but for beginners only.:
This book explains PLCs in terms of Allen Bradley PLCs. It is targeted at people that have never used a PLC before and does a good job of explaining the fundamentals of PLCs. If you are in this group, I would strongly recommend this book. However, it is not very helpful if you are already familiar with PLCs and are looking to learn about Allen Bradley products as much of the book concerns things such as what kind of devices are connected to PLCs, good installation practices, etc.