Now in its second edition, Introduction to Programmable Logic Controllers contains an all-new chapter on micro PLCs as well as newly available, manufacturer-specific photos to illustrate principles of PLC operation. Updated to include recent industry innovations, and expanded as a result of reader feedback, this book begins with an orientation to the general principles underlying all PLC operations which features leading manufacturers such as General Electric, Omron, Mitsubishi, and Seimens. Subsequent chapters invite readers to delve into the Rockwell Automation/Allen-Bradley SLC 500 family of PLCs, exploring their operation and instruction set(s) in detail. A well-engineered, fully integrated supplement package is also available for educators and trainers seeking to use this book to deliver a professional-level, hands-on PLC learning experience with minimal advanced preparation