The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 14, 2008
Filed:
Sep. 09, 2003
Joseph S. Blevins, Sr., Millersville, MD (US);
Joseph S. Blevins, Sr., Millersville, MD (US);
Union Switch & Signal, Inc., Pittsburgh, PA (US);
Abstract
An apparatus provides hot standby operation with normal and standby processors, each of which includes vital inputs electrically interconnected with the vital inputs of the other processor, vital outputs, and an application routine inputting the vital inputs and outputting the vital outputs. Communication ports communicate with communication ports of the other processor. A health routine provides a health status after communication is established with the other processor. A vital relay includes an input controlled by a vital output and an output to a vital input of the other processor. A synchronization routine provides a synchronization status through the communication ports. The application routine outputs the vital outputs when the synchronization status is set. The standby processor includes a reset routine, which resets the standby processor when the health status of that processor is not provided. A vital 'OR' circuit outputs from the vital outputs of the normal and standby processors.