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
X-ray imaging
Geographically self-labeling access points
Encryption using alternate authentication key
Pixel structure of organic light emitting device
Question and answer system wherein experts are associated with models and have response rates that are associated with time intervals
Chemically bonded carbon nanotube-polymer hybrid and nanocomposite thereof
Control of an electric machine
  Randomly Featured Patents
Translation display apparatus and method having designated windows on the display
Electro-optical device
Method and system of parsing frame headers for routing data frames within a computer network
Sheet treating apparatus, method of mounting sheet treating apparatus, and image forming apparatus
Skin incision device with compression spring assembly
Textile garment having replaceable elements of individual material
Apparatus and method for connecting an offshore platform riser to a pipeline
Photoresponsive imaging members with high molecular weight polysilylene hole transporting compositions
Staple cartridge in stapler