Journal of Institute of Control, Robotics and Systems (제어로봇시스템학회논문지)

Institute of Control, Robotics and Systems (제어로봇시스템학회)
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Synthesis of Deadlock-Free Ladder Diagrams for PLCs Based on Deadlock Detection and.Recovery (DDR) Algorithm

DDR 알고리즘에 기반한 교착상태배제 래더 다이어그램 설계

  • Cha, Jong-Ho (Dept.of Electric Electronics Information System Engineering, University of Ulsan) ;
  • Cho, Kwang-Hyun (Dept.of Electric Electronics Information System Engineering, University of Ulsan)
  • 차종호 (울산대학교 전기전자정보시스템 공학부) ;
  • 조광현 (울산대학교 전기전자정보시스템 공학부)
  • Published : 2002.08.01
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Abstract

In general, a deadlock in flexible manufacturing systems (FMSs) is caused by a resource limitation and the diversity of routings. However, the deadlock of industrial controllers such as programmable logic controllers (PLCs) can occur from different causes compared with those in general FMSs. The deadlock of PLCs is usually caused by an error signal between PLCs and manufacturing systems. In this paper, we propose a deadlock detection and recovery (DDR) algorithm to resolve the deadlock problem of PLCs at design stage. This paper employs the MAPN (modified automation Petri net), MTPL (modified token passing logic), and ECC (efficient code conversion) algorithm to model manufacturing systems and to convert a Petri net model into a desired LD (ladder diagram). Finally, an example of manufacturing systems is provided to illustrate the proposed DDR algorithm.

Keywords

References

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