The paper presents safety and fault-tolerance technology of railway signalling. First, the type of faults to be handled and the required level of safety and reliability are given. Next, two types of microcomputer architectures with hardware redundancy are shown. Fault-tolerant system structures with triple-modular-redundancy and duplex, which have been applied to signalling systems in Japan Railways are also described. Further, software approach to fail-safety and fault-tolerance is discussed. Field data on 4 kinds of microcomputer-controlled signalling systems are shown. Since 1985 about 650 sets of fail-safe microcomputers have been operating in Japan Railways. An endangering failure has never occurred and the safe-side failure rate up to now including an initial error period has been in the order of 10(exp-5)/h to 10(exp-6)/h.
Safety and Fault-Tolerance in Computer-Controlled Signalling Systems
1990
10 pages
Report
Keine Angabe
Englisch
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