iv Reviewers The author and publisher wish to thank the following industry and teaching professionals for their valuable input into the development of Programmable Logic Controllers. Robert Schwien Moraine Valley Community College Palos Hills, Illinois Robert DeBrecht Electrical Engineer Asheville, North Carolina An drea Blaylock Triton College River Grove, Illinois Gholam H. Massiha University of Louisiana at Lafayette Lafayette, Louisiana Wes Gubitz Cape Fear Community College Wilmington, North Carolina David Hartle SUNY Canton Canton, New York Martin D. Keane, PE United States Gypsum Chicago, Illinois Jim Wilks Mohawk College Hamilton, Ontario, Canada Tom Lockett Vatterott College Quincy, Illinois Keith Casey Wilkes Community College Wilkesboro, North Carolina Acknowledgments The author and publisher would like to thank the following companies, organizations, and individuals for their contribution of resource material, images, or other support in the development of Programmable Logic Controllers. Rockwell Automation, Inc. Logic Design, Inc., developers of PLCLogix simulator software Siemens Energy Concepts, Inc. In addition, the author and publisher wish to thank Bill Simpson of The Learning Pit, developer of the LogixPro 500 PLC Simulator Software. Many illustrations and examples found throughout this textbook were created using this software. To learn more about this software, visit www.thelearningpit.com.