Switched Ethernet in Synchronized Distributed Control Systems Using RTnet

Luca Boncagni, Antonio Barbalace, Yahya Sadeghi, Marco Pompei, Luca Zaccarian, Filippo Sartori

Research output: Contribution to journalArticlepeer-review

Abstract

We adopt a model of a real-time distributed network where the synchronization is done by an external timing network that triggers the acquisitions. A Switched Ethernet is used to send the synchronously sampled data from nodes to nodes to perform the distributed control algorithm. In order to guarantee low latencies and jitter, the traffic on the Switched Ethernet must be carefully analyzed to be able to correctly model closed-loop systems and potentially identify events that might lead to large delays or even packet losses. In this paper we discuss the most relevant results from a testbed control network with synchronous data acquisition nodes. A switched Gigabit Ethernet is adopted and each node uses RTnet running in a RTAI/Linux Operating System. To resolve the problem of timing uncertainties at the data link layer, we propose a new custom solution based on a TDMA discipline.
Original languageEnglish
Pages (from-to)1793-1799
Number of pages7
JournalIEEE Transactions on Nuclear Science
Volume58
Issue number4
DOIs
Publication statusPublished - 20 Jun 2011

Keywords

  • data acquisition
  • fusion reactor instrumentation
  • local area networks
  • nuclear engineering computing
  • synchronized distributed control systems
  • real-time distributed network
  • external timing network
  • synchronously sampled data
  • distributed control algorithm
  • closed-loop systems
  • testbed control network
  • synchronous data acquisition nodes
  • switched Gigabit Ethernet
  • RTAI operating system
  • Linux operating system
  • plasma fusion
  • Switches
  • Ethernet networks
  • Delay
  • Hardware
  • Real time systems
  • Synchronization
  • Gigabit ethernet
  • linux
  • real-time
  • RTAI
  • RTnet
  • switched ethernet
  • synchronous ethernet
  • timing network

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