Industrial controller with coordinated timing

Details Industrial controller with coordinated timing Industrial controller with coordinated timing

1994-05-31

1996-05-21

Chin, Stephen

Pulse or digital communications

Testing

375358, 370 15, H04B 346, H04B 1700, H04Q 120

Patent

active

055197264

ABSTRACT:
A method for 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 value to various dependent modules through communication modules. The particular time-master is determined by an arbitration process among potential masters which examines a time quality value, indicating the precision of the time-master's clock, and incorporated in the transmitted synchronization signal. Upon the loss of a master or the introduction of a new master, mastership is reallocated so that the master time value is provided from that module having the best time quality. Offset caused by "ripple through" of the time value through communication modules is minimized by summing to that time value as it traverses a communication module with a time quantity measuring the processing time of the communication module.

REFERENCES:
patent: 4677614 (1987-06-01), Circo
patent: 4736393 (1988-04-01), Grimes et al.
patent: 5068877 (1991-11-01), Near et al.

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