| 摘要 |
FIELD: automatics and computer engineering, possible use during construction of highly reliable devices and systems, for example, redundant systems for processing unit-counting codes in automatic locomotive signaling unit. ^ SUBSTANCE: device has three identical functional redundancy elements, connected in parallel and performing processing of incoming input signal, three logical elements AND of the same name, connected to outputs of aforementioned redundancy elements, with one channel at output, and executive element, where each logical element AND is connected to output of functional redundancy element of the same name and is made on basis of two-contact relay with galvanically isolated contacts, which simultaneously close on excitation of relay under effect from signal at outputs of functional redundancy elements of the same name and connected in accordance to majority selection circuit "two out of three", in which power to executive element is fed through three parallel electrical circuits, formed by serially connected contacts of logical elements AND in such a way, that in first circuit connected serially are first contact of first relay and first contact of second relay, in second circuit - second contact of first relay and first contact of third relay, and connected serially in third circuit are second contact of second relay and second contact of third relay. Logical elements AND may be made in form of two-transistor optoelectronic couples or other devices of similar type. Therefore, in case of failure of any single functional element, and also one of three logical AND elements, for example, a relay or its contacts, device will continue functioning normally, sending signal to executive element, resulting in increased fault tolerance of device. New feature of device, described above, is achieved due to introduction of AND elements to majority selection circuit. ^ EFFECT: increased fault tolerance of system. ^ 2 cl, 2 dwg |
