Real-time Ethernet networks for motion control

Authors:
S. Vitturi;L. Peretti;L. Seno;M. Zigliotto;C. Zunino
Affiliations:
Italian National Council of Research, IEIIT-CNR Padova and Department of Information Engineering, University of Padova, Italy;Department of Technique and Management of Industrial Systems, University of Padova, Vicenza, Italy;Italian National Council of Research, IEIIT-CNR Padova and Department of Information Engineering, University of Padova, Italy;Department of Technique and Management of Industrial Systems, University of Padova, Vicenza, Italy;Italian National Council of Research, IEIIT-CNR Torino, Italy
Venue:
Computer Standards & Interfaces
Year:
2011

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Abstract

Communication networks have been traditionally employed in motion control applications, especially within factory automation systems. While in the past they were merely used to exchange non time critical data (e.g. parameters and configuration data) nowadays they allow for much more powerful performance. In particular, the recently introduced Real-time Ethernet (RTE) networks, have been explicitly designed in order to cope with very tight timing constraints in terms of both determinism and real-time. In this paper we focus on two popular RTE networks, namely Ethernet POWERLINK and EtherCAT, and provide an example of their employment for a coordinated motion control application. In particular, we consider the tracking of a circular trajectory by the coordinated motion of two independent axes where the velocity set-points are transmitted to the electrical drives implementing the axis control by means of the RTE networks. After providing some essential features of the two networks, we describe the configurations adopted for the coordinated motion control application. Then we check the effectiveness of the solution proposed by means of numerical simulations which take into consideration possible error scenarios deriving from the adoption of the communication networks such as transmission errors, communication delays and cable breaks.