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. 07, 1986
Filed:
Feb. 28, 1983
Helmut Uebel, Leonberg, DE;
International Standard Electric Corporation, New York, NY (US);
Abstract
A fail-safe 2-out-of-3 selecting facility for a 3-computer system is disclosed which is especially suitable for use together with microprocessors having a large number of outputs. The computers (R1 . . . R3) of the 3-computer system handle the same information in parallel but asynchronously, exchange their results, and compare them. The output buses (A1, A3) of two computers (R1, R3) transfer the results in nonequivalent form, and are connected to two data output channels (AK1, AK2) via separate transfer switches (U1, U2). Depending on the result of the comparisons performed in the computers, the output ports of faulty computers are disconnected and the transfer switches are controlled in such a way that the output port of a faulty computer is disconnected from the associated data output channel, and that the output port (A2) of the third computer (R2) is connected to this channel instead. Depending on which computer is to be replaced, the third computer (R2) delivers its information in uninverted or inverted form. The operation of the transfer switches can be monitored by a serial nonequivalence check on the information transfered over the data output channels (AK1, AK2).