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
Surface emitting laser device, surface emitting laser array, optical scanning device, and image forming apparatus
Unsupervised document clustering using latent semantic density analysis
Information processing apparatus and storage medium for storing information processing program
Electrical converter with variable capacitor
Electric rotating machine for vehicle
Methods and compositions for inhibition of neutrophil exocytosis
Ejection station
  Randomly Featured Patents
Data synchronization method and related apparatus for a display device
Constrained keyboard organization
Variable length codes for high quality image encoding
Method for manufacturing gallium nitride compound semiconductor
Treatment of semiconductor substrates using long-chain organothiols or long-chain acetates
Fluorinated diphenols and method for their preparation
Method and apparatus for quantitatively determining whether at least one of two or more ferromagnetic components is missing from an assembly
Ladder leveling device
Redundant assembly for a liquid and air cooled module
Arrangement for cooling pistons and cylinder sleeves