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
Binary-to-gray converting circuits and gray code counter including the same
Quinazoline compounds and their use in perfume compositions
System and method of creating and providing SMS http tagging
Device for transmitting data between a serial data bus and working modules such as actuator modules and/or I/O modules
LED package chip classification system
Method of fabricating crystal unit, crystal unit fabrication mask, and crystal unit package
Compact light shield for flash photography
  Randomly Featured Patents
Stack pack electrolytic cell
Snowmobile steering and suspension system
Cordless electric can opener
Method of stabilizing soil, beaches and roads
System and method for adjusting logic synthesis based on power supply circuit models
Light diffraction member and display and backlight module having the same
Method and programmable device for generating variable width pulse trains
Process for preparing triazoles fused with aromatic systems by reaction of o-arylenediamines with nitrites
Alumina coated cutting tool
Collapsible play yard