G - Physics – 06 – F
Patent
G - Physics
06
F
354/225.2
G06F 11/18 (2006.01)
Patent
CA 1199119
Abstract of the Disclosure 2-out-of-3 Selecting Facility in a 3-Computer System 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, ex- change 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 out- put channels (AK1, AK2) via separate transfer switches (U1, U2). Depending on the result of the comparisons per- formed in the computers, the output ports of faulty com- puters are disconnected and the tansfer switches are con- trolled 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 com- puter (R2) is connected to this channel instead. Depen- ding on which computer is to be replaced, the third com- puter (R2) delivers its information in univerted or in- verted form. The operation of the transfer switches can be monitored by a serial nonequivalence check on the in- formation transfered over the data output channels (AK1, AK2). (Figure)
423226
International Standard Electric Corporation
Smart & Biggar
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