Robust formal specification of control logic is vital for efficient developmentof discrete-event control software for real-time manufacturing systems.This paper classifies real-time control specification methodologies into three types based on their levels of abstraction. Representative methodologies in each class are briefly introduced, including a new methodology called discrete-event control networks (DECN). An example of a manufacturing discrete-event control system is presented and the logic is developed under each of the methodologies for comparison. The desirable characteristics and functions of real-time manufacturing systems specifications are identified. The paper then discusses the relative abilities of the representative methodologies to address these characteristics.
Application of graphical specification methodologies to manufacturing control logic development: A classification and comparison
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