Book excerpt: Gives a real world explanation of how to analyze and troubleshoot a process control system in a batch process plant • Explains how to analyze the requirements for controlling a batch process, develop the control logic to meet these requirements, and troubleshoot the process controls in batch processes • Presents three categories of batch processes (cyclical batch, multigrade facilities, and flexible batch) and examines the differences in the control requirements in each • Examines various concepts of a product recipe and what its nature must be in a flexible batch facility • Approaches the subject from the process perspective, with emphasis on the advantages of using structured logic in the automation of all but the simplest batch processes. • Discusses the flow of information starting at the plant floor and continuing through various levels of the control logic up to the corporate IT level