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:
Apr. 22, 1986
Filed:
Aug. 31, 1983
John L Carey, Jr, Warrington, PA (US);
Jack Elias, Lansdale, PA (US);
Honeywell Inc., Minneapolis, MN (US);
Abstract
A process controller with power outage analysis capability uses a real time clock generator powered by an uninterruptible power source for providing a real time reference which is used to measure the actual duration of a process controller disabling power outage. A non-volatile memory is also powered by the uninterruptible power source and is used to store the maximum allowable outage time limit for a particular process being controlled. The clock generator is initialized at the start of the power outage by a power outage detector which provides an early warning of an imminent power outage. After the power is restored to the controller, a digital computer used in the process controller compares the actual power outage time as represented by the accumulated clock time with allowable power outage time limit stored in the memory and is arranged to provide a first process control sequence if the actual power outage time is less than the maximum allowable time and a second process control sequence if the actual power outage time is greater than the maximum allowable time.