COMPUTERS REPLACING SAFETY RELAYS IN RAILWAY SIGNALLING

For 40 years safety relays have been the predominant technology for railway signaling systems with fail-safe demands. During the last years computers have been introduced for vital functions. To fulfill fail-safe requirements different methods have been used to overcome the non-asymmetric fail-function of electronic components and systems. This paper covers and evaluates some of these methods. As a result, an approach to achieve a fail-safe computer system is suggested. In a computer system for vital functions the information is processed twice by two independently designed and executed program versions in the same computer resulting in a safe and economic solution.

Media Info

  • Features: References;
  • Pagination: p. 321-328

Subject/Index Terms

Filing Info

  • Accession Number: 00182798
  • Record Type: Publication
  • Source Agency: Engineering Index
  • Report/Paper Numbers: Proceeding
  • Files: TRIS
  • Created Date: Oct 31 1978 12:00AM