Synchronizable local clock for industrial controller system

Details Synchronizable local clock for industrial controller system Synchronizable local clock for industrial controller system

1994-07-18

1997-08-26

Roskoski, Bernard

Horology: time measuring systems or devices

Plural timepiece system or system device

368 10, G04B 4700, G04C 1100

Patent

active

056617003

ABSTRACT:
A method of providing a standard coordinated time throughout spatially separated functional modules of an industrial controller employs a module operating as a time master which transmits a coordinated time to various dependent modules through communication modules. The dependent modules have local clocks which are synchronized to the coordinated time value by adjusting their clock frequency according to the difference between local time provided by that clock and the coordinated time value. This gradual correction prevents lost count values and disruption to the control process. The most and least significant bits of the time value may be transmitted at separate rates to reduce link traffic.

REFERENCES:
patent: 4746920 (1988-05-01), Nellen et al.
patent: 4952367 (1990-08-01), Porter et al.
patent: 5040158 (1991-08-01), Lee et al.
patent: 5087829 (1992-02-01), Ishibashi et al.
patent: 5402394 (1995-03-01), Tursky

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