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:
Nov. 03, 2009
Filed:
Dec. 04, 2006
Jun Takehara, Tokyo, JP;
Akira Sawada, Tokyo, JP;
Makoto Toko, Saitama, JP;
Hiroyuki Kusakabe, Tokyo, JP;
Shinya Kono, Tokyo, JP;
Yuuji Umeda, Tokyo, JP;
Jun Takehara, Tokyo, JP;
Akira Sawada, Tokyo, JP;
Makoto Toko, Saitama, JP;
Hiroyuki Kusakabe, Tokyo, JP;
Shinya Kono, Tokyo, JP;
Yuuji Umeda, Tokyo, JP;
Kabushiki Kaisha Toshiba, Tokyo, JP;
Abstract
An object is to provide a redundant supervisory control system and a redundancy switching method thereof. In the redundant supervisory control system, remote I/O apparatuses are less likely to be inaccessible, even in a case where failures occur in plural locations. Thus, the reliability of the system is enhanced. The redundant supervisory control system including a plurality of first loop interface units in each of a pair of controllers, second loop interface units, and communication cables each connecting the plurality of first and second loop interface units with one another in a circular loop. The redundant supervisory control system is configured by connecting the controllers and the remote I/O units to one another in a plurality of loop networks. In a case where abnormality in the loop networks is detected by use of received data in the networks, the first and second loop interface units that can perform normal reception are automatically selected.