Discrete event control system design using automation Petri nets and their ladder diagram implementation |
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Authors: | Dr M. Uzam A. H. Jones |
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Affiliation: | (1) Mühendislik-Mimarlik Fakültesi, Elektrik-Elektronik Mühendisligi Bölümü, Nigde Üniversitesi, 51100 Nigde, Turkey;(2) Intelligent Machinery Division, Telford Research Institute, Research and Graduate College, University of Salford, Salford, UK |
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Abstract: | As automated manufacturing systems become more complex, the need for an effective design tool to produce both high-level discrete event control systems (DECS) and low-level implementations becomes more important. Petri nets represent the most effective method for both the design and implementation of DECSs. In this paper, automation Petri nets (APN) are introduced to provide a new method for the design and implementation of DECSs. The APN is particularly well suited to multiproduct systems and provides a more effective solution than Grafcet in this context. Since ordinary Petri nets do not deal with sensors and actuators of DECSs, the Petri net concepts are extended, by including actions and sensor readings as formal structures within the APN. Moreover, enabling and inhibitor arcs, which can enable or disable transitions through the use of leading-edge, falling-edge and level of markings, are also introduced. In this paper, the methodology is explained by considering a fundamental APN structure. The conversion of APNs into the IEC1131-3 ladder diagrams (LD) for implementation on a PLC is also explained by using the token passing logic (TPL) concept. Finally, an illustrative example of how APNs can be applied to a discrete manufacturing problem is described in detail. |
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Keywords: | Automated manufacturing systems Discrete event control systems IEC1131-3 standard Petri nets Programmable logic controllers Real-time implementation |
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