Registers – Systems controlled by data bearing records – Time analysis
Patent
1977-09-19
1979-04-10
Atkinson, Charles E.
Registers
Systems controlled by data bearing records
Time analysis
307219, 3401461BE, G06F 1108
Patent
active
041490690
ABSTRACT:
The invention relates to a safety circuit for a data processing system comprising two micro computers which operate in a redundant fashion receiving similar inputs and having similar output lines conveying coincident or corresponding signals during proper operation which are indirectly connected to a common push-pull amplifier. A transformer is connected in circuit with the push-pull amplifier and a conversion circuit constructed from the flip-flop trigger elements produces a pair of signals for operating the push-pull amplifier when the signal pair logic 1 exists. When the signal pair of logic 0 exists, the push-pull amplifier does not operate. The conversion circuit operates in connection with a clock pulse current supply for the two micro computers so that in the case of malfunction, no clock pulses are produced.
REFERENCES:
patent: 3509532 (1970-04-01), Vande Wege
patent: 3517174 (1970-06-01), Ossfeldt
patent: 3810119 (1974-05-01), Zieve et al.
patent: 3978327 (1976-08-01), Huber
patent: 4012717 (1977-03-01), Censier et al.
patent: 4030074 (1977-06-01), Giorcelli
Atkinson Charles E.
Siemens Aktiengesellschaft
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