Resources Contact Us Home
Industrial controller with coordinated timing

Image Number 3 for United States Patent #5519726.

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.

  Recently Added Patents
Method and system for prioritizing points of interest for display in a map using category score
Digital broadcast receiver and method for processing caption thereof
Toy vehicle housing
Statistical information collection from one or more device(s) in storage communication with a computing platform
Pulsed plasma with low wafer temperature for ultra thin layer etches
Electric washing machine
Integrated bug tracking and testing
  Randomly Featured Patents
Thermal graphic pen and method of use
Device and method for signal quality determination
Spray gun body
Liquid-cooled heat sink with thermal jacket
Ergonomic microscope and microscope carrier
Skirt for ice cream cones
Method of producing a spring wire and wire thus produced
Method and apparatus for preparing serial planar cross sections
Apparatus for regulating the lapping pressure during lapping of two bevel gears in a lapping machine
Method for altering permeability of a hydrocarbon-containing formation