NDLI: Synchronisation in safety-critical distributed control systems

Content Provider	IEEE Xplore Digital Library
Author	Lonn, H. Snedsbol, R.
Copyright Year	1995
Description	Author affiliation: Dept. of Comput. Eng., Chalmers Univ. of Technol., Goteborg, Sweden (Lonn, H.; Snedsbol, R.)
Abstract	Distributed computer systems for real-time control require a global timebase with high precision. A small time skew between local clocks in the system is required to obtain good control performance through well synchronised task execution, but also provides a base for efficient communication. In distributed safety critical applications, clocks have traditionally been synchronised with fault tolerant clock synchronisation algorithms. With these methods, a limited number of erroneous clock readings are allowed in each adjustment. On the other hand, readings from all clocks in the system are required before an adjustment can be made. In this paper an alternative approach, the Daisy Chain method, is proposed and compared with present solutions. Daisy Chain synchronisation does not allow erroneous clock readings, but methods of avoiding them are described. Due to its simplicity, the method can be implemented with little hardware. Low precision frequency sources are sufficient and recovery after arbitrary failures is fast because no special start up phase is required. The paper also discusses effects of quantisation uncertainty and transmission delay, and outline the implementation of a global time base in an embedded distributed real-time architecture.<>
Starting Page	891
Ending Page	899
File Size	741402
Page Count	9
File Format	PDF
ISBN	0780320182
DOI	10.1109/ICAPP.1995.472284
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1995-04-19
Publisher Place	Australia
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Distributed control Clocks Frequency synchronization Communication system control Control systems Distributed computing Real time systems Safety Application software Fault tolerance
Content Type	Text
Resource Type	Article

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1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
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3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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