Method for time synchronization in distributed control system

Pulse or digital communications – Synchronizers

Reexamination Certificate

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C375S355000

Reexamination Certificate

active

07831000

ABSTRACT:
A method for time synchronization in a distributed control system includes the steps of: when a sync is received from a master-side, confirming both a reception time point of the corresponding sync and a compensation time point of a previous frequency, and determining if a result obtained by confirming the two time points corresponds to a preset Frequency Compensation Interval (FCI); performing only a time offset compensation operation when the result obtained by confirming the two time points does not correspond to the preset FCI; and performing both time offset and frequency compensation operations when the result obtained by confirming the two time points corresponds to the preset FCI.

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Puneet Sharma, “IEEE 1588 in Network Processors for Next-Generation Industrial Automation Solutions” Technology@Intel Magazine, Intel Corporation, 2005.
Sihai Wang, Jaehun Cho, Geoffrey M. Garner, “Improvements to Boundary Clock Based Time Synchronization through Cascaded Switches,” 2006 Conference on IEEE 1588 Standard or a Precision Clock Synchronization Protocol for Networked Measurement and Control Systems, National Institute of Standards and Technology,Gaithersburg, Maryland, USA, Oct. 2-4.
Sivaram Balasubramanian, Kendal R. Harris and Anatoly Moldovansky, “A Frequency Compensated Clock for Precision Synchronization using IEEE 1588 Protocol and its Application to Ethernet,” Rockwell Automation. Sep. 24, 2003. http://ieee1588.nist.gov/z—RA—1—FreqCompClk.pdf.
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The Institute of Electrical and Electronics Engineers, Inc. “IEEE Standard for a Precision Clock Synchronization Protocol for Networked Measurement and Control Systems.” Nov. 8, 2002. 144 pages.

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