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. 06, 2007
Filed:
Feb. 26, 2001
Kazuhiko Miura, Hitachi, JP;
Shoei Takahashi, Hitachi, JP;
Kazuyasu Asakura, Hitachi, JP;
Yoshio Maruyama, Mito, JP;
Katsuhito Shimizu, Hitachi, JP;
Yukiko Mori, Hitachi, JP;
Tohru Akatsu, Hitachi, JP;
Kazuhiko Miura, Hitachi, JP;
Shoei Takahashi, Hitachi, JP;
Kazuyasu Asakura, Hitachi, JP;
Yoshio Maruyama, Mito, JP;
Katsuhito Shimizu, Hitachi, JP;
Yukiko Mori, Hitachi, JP;
Tohru Akatsu, Hitachi, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
A multiplexing control system has a common process input/output unit for distributing process signals from sensors for measuring the same state variable of a process to digital controllers. One process input/output unit for inputting/outputting a process signal between the multiplexing control system and plant is provided for each process signal. The process input/output unit for the process signal of high importance is triplexed. A process controller having an operating function is provided to each of the triplexed process input/output units. A process input/output unit for the process signal of intermediate importance is diplexed. A process input/output unit for the process signal of low importance is monoplexed. The process signals of the diplexed process input/output units and the monoplexed process input/output unit are controlled by a controller having a master right among the process controllers.