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:
Jul. 06, 2004
Filed:
Jan. 17, 2001
William Cook, Northfield, OH (US);
Mark Flood, Mayfield Hts., OH (US);
Rockwell Automation Technologies, Inc., Mayfield Heights, OH (US);
Abstract
A method and apparatus are disclosed for performing timely execution of periodic tasks in a redundant control system. A secondary controller in the redundant system receives a wakeup time array having at least one wakeup time element corresponding to a periodic task as well as a current time value from a primary controller, and schedules a run time for the periodic task at switchover based on the wakeup time element and the current time value from the primary control module. The secondary controller may further receive a task instance corresponding to the periodic task from the primary control module, and schedule a run time for the periodic task at switchover based on the task instance. In addition, the secondary controller may schedule a run time for the periodic task at switchover based on a default period associated with the periodic task, if no task instance and no wakeup time element were received corresponding to the periodic task.