Enforcing the timing behavior of real-time stations in legacy bus-based industrial Ethernet networks

Authors:
Ricardo Moraes;Francisco Borges Carreiro;Paulo Bartolomeu;Valter Silva;José Alberto Fonseca;Francisco Vasques
Affiliations:
IT-Instituto de Telecomunicaçíes, University of Aveiro, Portugal;IFMA-Instituto Federal de Educação, Ciência e Tecnologia do Maranhão;IT-Instituto de Telecomunicaçíes, University of Aveiro, Portugal;Departamento de Electrónica e Telecomunicaçíes, University of Aveiro, Portugal;IT-Instituto de Telecomunicaçíes, University of Aveiro, Portugal;Faculdade de Engenharia, University of Porto, Portugal
Venue:
Computer Standards & Interfaces
Year:
2011

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Abstract

This paper proposes a virtual token-passing mechanism, which allows the coexistence of legacy industrial Ethernet devices with enhanced (real-time) devices in the same bus network. The VTPE mechanism allows the implementation of real-time (RT) applications upon legacy bus-based industrial networks, enforcing the adequate timing behavior of the supported applications. It enables the traffic separation between legacy Ethernet stations and enhanced (RT) stations. A set of experiments has been performed, which allowed to measure the message access delay and the token rotation time. The achieved results clearly demonstrate that the VTPE architecture enables the support of RT communication upon legacy bus-based industrial Ethernet networks, even when the communication medium is shared with uncontrolled traffic sources.