Updated to reflect recent industry developments, this edition features practical information on rockwell automation?s slc 500 family of plcs and includes a no-nonsense introduction to rslogix software and the new controllogix plc. To assist readers in understanding key concepts, the art program has been modernized to include improved illustrations, current manufacturer-specific photos, and actual rslogix software screens to visibly illustrate essential principles of plc operation. New material has been added on controlnet and devicenet, and a new chapter on program flow instructions includes updated references to the slc 500, micrologix, and the plc 5.