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:
Feb. 14, 1995
Filed:
Nov. 25, 1992
Yasuhiko Shioe, Tokyo, JP;
Chuji Akiyama, Tokyo, JP;
Toshiaki Shirai, Tokyo, JP;
Hideyuki Sakamoto, Tokyo, JP;
Hitoshi Yasui, Tokyo, JP;
Makio Ishikawa, Tokyo, JP;
Hideo Matsukawa, Tokyo, JP;
Yokogawa Electric Corporation, Tokyo, JP;
Abstract
A distributed control system comprising a control station and a remote input/output device interconnected by a bus, wherein the system is provided with a continuation transmission service which first transmits an urgent output only and then performs cyclic scan transmission; an initialization start transmission service which first performs cyclic scan transmission for input only; an interruption duration measuring feature which measures the period of transmission interruption; and a control feature which activates the continuation transmission service when the result of the measurement is shorter than a predetermined period of time, and which activates the initialization start transmission service when the result of the measurement is longer than the predetermined period of time. Thus, for example, after a power supply failure, the system can rapidly recover and shift to normal process controlling operation without the delays normally experienced by prior control systems.