Cascading Logic

Cascading Logic: A Machine Control Methodology for Programmable Logic Controllers explains how to develop a functional machine control program for industrial equipment that operates sequentially. The programming approach begins by breaking the machine into its fundamental components. These small, manageable parts help the programmer focus on major concerns before addressing details. The method then explains how to program each component and how to assemble the components into a complete machine control system. This book aims to give the reader the confidence to make decisions and proceed with certainty that the program works as intended, without odd logic combinations causing unintended actions. The sequential order of events also assists operators and maintenance staff in troubleshooting and maintaining the equipment after deployment. Ladder logic illustrations demonstrate each section of the text. Although the ladder logic examples use the instruction set for the Allen-Bradley SLC 500 PLC, the concepts and techniques are applicable to any brand of PLC.