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:
Jan. 23, 2018
Filed:
Mar. 29, 2013
Hitachi, Ltd., Tokyo, JP;
Shoji Yunoki, Tokyo, JP;
Tsutomu Yamada, Tokyo, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
The present invention detects abnormality in a control network in which a normal pattern of communication changes in accordance with the state of a control system. A normal pattern of communication between devices is stored for each state, information indicating the system state is acquired to determine the system state, and information indicating the pattern of communication between devices is acquired to determine the pattern of communication. Then, by determining, on the basis of the determined pattern of communication and the pattern of communication stored as a normal pattern of communication in the determined system state, whether system abnormality has occurred, it is possible to enhance the availability and reliability of the control network.