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
Field emission cathode structure
Solid-state image capture device and image capture apparatus
Simulating non power of two texture behavior
LED light
Methods and devices for multiple-mode radio frequency synthesizers
Methods and systems for presenting an inhalation experience
Substituted bicyclic HCV inhibitors
  Randomly Featured Patents
Cloth pressing device of sewing machine
Method for using a tissue stabilization device during surgery
Multiple nozzle on a flexible strap for a garden sprayer
Multi-digit luminescent display tube
Method and apparatus to manufacture a towel or tissue stack
Conveyor segment and assembly for use in high wall mining, and coupling and releasing methods
Tire and rim assembly with the tire having 15 degree taper bead parts
Synthetic lubricating oil
Hemoglobin crosslinkers
Moving object tracking method using occlusion detection of the tracked object, and image processing apparatus