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  Ethernet-based real-time control data bus

Laqua, H., Niedermeyer, H., & Willmann, I. (2002). Ethernet-based real-time control data bus. IEEE Transactions on Nuclear Science, 49(2), 478-482.

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 Creators:
Laqua, H.1, 2, 3, Author           
Niedermeyer, H.1, Author           
Willmann, I.4, Author           
Affiliations:
1W7-X: Construction, Max Planck Institute for Plasma Physics, Max Planck Society, ou_1856314              
2W7-AS, Max Planck Institute for Plasma Physics, Max Planck Society, ou_1856310              
3Experimental Plasma Physics 3 (E3), Max Planck Institute for Plasma Physics, Max Planck Society, ou_1856291              
4Max Planck Institute for Plasma Physics, Max Planck Society, ou_1856284              

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 Abstract: Wendelstein 7-X is designed as a steady-state experiment to demonstrate the fusion reactor relevance of the advanced stellarator concept. The experiment's control and data acquisition will be performed by a distributed system of computers and programmable logic controllers (PLCs). Data of several systems have to be combined flexibly to control the machine, requiring a data exchange on a millisecond time scale between several connected units. A discharge can last up to half an hour, thus, the connections may vary during a discharge. Hence, it is desired to provide control relevant data, e.g., measurands, set points, interlock signals, cyclically via a bus system. The paper will analyze the special quality of control data streams and deduce the basic requirements for a real-time data bus. Ethernet is a candidate for the data bus since it is a widely used broad-band bus with a foreseeable potential for development. Because of its nondeterministic arbitration algorithm Ethernet is generally considered not to be suited for hard real-time applications. It is possible to circumvent this disadvantage of Ethernet either by using switching techniques or a software token to obtain a reliable base for hard real-time data transport.

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Language(s): eng - English
 Dates: 2002-04
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: eDoc: 20884
ISI: 000175820900028
 Degree: -

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Title: IEEE Transactions on Nuclear Science
  Alternative Title : IEEE Trans. Nucl. Sci.
Source Genre: Journal
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Pages: - Volume / Issue: 49 (2) Sequence Number: - Start / End Page: 478 - 482 Identifier: ISSN: 0018-9499