PLC Program Monitoring for Manufacturing Systems Using PLC Signal Time Difference

PLC 신호의 시간차이를 이용한 자동화 공정의 PLC프로그램 모니터링

  • 성길영 (아주대학교 산업공학과) ;
  • 한관희 (경상대학교 산업시스템공학부) ;
  • 변재정 (국방과학연구소) ;
  • 왕지남 (아주대학교 산업정보시스템공학부) ;
  • 박상철 (아주대학교 산업정보시스템공학부)
  • Published : 2009.06.30

Abstract

Modern manufacturing systems consist of highly automated manufacturing devices, and they are controlled by complicated PLC programs. To make sure the achievement of the control objectives of a manufacturing system, it is very important to monitor the dynamic system behaviors of the manufacturing system. In this paper, we propose a monitoring methodology of a PLC program based on the Software In the Loop Simulation(SILS), which makes use of the time gap information between PLC signals. The errors relevant with PLC signals can be found using the proposed methodology, comparing a normal PLC signal trajectory with a target PLC signal trajectory. The proposed methodology has been implemented and tested with simple examples.

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