MODELING. ANALYSIS, AND IMPLEMENTATION OF LOGIC CONTROLLERS FOR MACHINING SYSTEMS USING PETRI NETS AND SFC

The logic control for high-volume machining systems, such as the transfer lines commonly used in the automotive manufacturing industry, must achieve multiple functions in distinct control modes, and thus is quite complex. A methodology for constructing the logic controller using Petri nets is outlined. Each operation in the machining system is assigned either a reversible or irreversible operation module, and an algorithm for connecting these modules to form the control logic is presented. The resulting logic controller is guaranteed to be live, safe, and reversible. The logic controller can be implemented in SFC.