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. 12, 2021
Filed:
Apr. 13, 2018
Applicant:
Omron Corporation, Kyoto, JP;
Inventor:
Shinsuke Kawanoue, Kyoto, JP;
Assignee:
OMRON Corporation, Kyoto, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G06F 16/23 (2019.01); G06F 1/14 (2006.01); G06F 16/22 (2019.01); G06F 16/2458 (2019.01); G06F 17/40 (2006.01);
U.S. Cl.
CPC ...
G06F 16/2365 (2019.01); G06F 1/14 (2013.01); G06F 16/2282 (2019.01); G06F 16/2474 (2019.01); G06F 16/2477 (2019.01); G06F 17/40 (2013.01);
Abstract
Data is recorded to a time-series database embedded in a PLC. A local clock of the PLC is corrected by accessing a time server such as an NTP server on a regular basis. At that time, a time correction amount and an NTP-ID for identifying each iteration of correction processing are recorded to an NTP log in association with each other. When a query arrives, a time stamp of a record corresponding to a designated time range is modified by proportionally distributing the time correction amount of the corresponding NTP-ID.