Fehlertolerierende Rechensysteme / Fault-tolerant Computing by Rolf Isermann (auth.), Winfried Görke, Holger Sörensen

By Rolf Isermann (auth.), Winfried Görke, Holger Sörensen (eds.)

Dieses Buch enthält die Beiträge der four. GI/ITG/GMA-Fachtagung über Fehlertolerierende Rechensysteme, die im September 1989 in einer Reihe von Tagungen in München 1982, Bonn 1984 sowie Bremerhaven 1987 veranstaltet wurde. Die 31 Beiträge, darunter four eingeladene, sind teils in deutscher, überwiegend aber in englischer Sprache verfaßt. Insgesamt wird durch diese Beiträge die Entwicklung der Konzeption und Implementierung fehlertoleranter Systeme in den letzten zwei Jahren vor allem in Europa dokumentiert. Sämtliche Beiträge berichten über neue Forschungs- oder Entwicklungsergebnisse.

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Ausgegangen und Dabei wird die Fehlerstelle lokali- 39 siert und ein feh1erfreier Ubertragungsweg gesucht, so daB die MeBdaten der Feh1ers, "ansprechbaren Schnittste11eneinheiten" bis zur Behebung des wie in Bi1d 5 dargeste11t, ubertragen werden konnen. Eine Feh1erkennung mit Feh1erortangabe wird ausgegeben. Die Schnittste11eneinheiten sind auf einer einfachen Europa-Karte aufgebaut: der Strombedarf betragt 45 mA bei 12 V Versorgungsspannung. 2 Fe1dbussystem zur Aus10sung von Scha1tvorgangen Die genere11e Struktur des Fe1dbussystems zur Aus10sung von Scha1tvorgangen ist in Bi1d 6 dargeste11t.

B. ~ Ttlv-Klasse 2, einheitlich fUr die wichtigsten Anwendungen, auch die mit geringeren SicherheitsAuf1agen. Entwick1ungszie1 war, eine sicherheitsgerichtete SPS in die aktuelle SPS-Pamilie zu integrieren und diese SPS aus bereits existierenden Hardware-Komponenten zusammenzusetzen. Dadurch kann man manchen Kunden Schulung, Inbetriebnahme und Wartung erleichtern, weil diese ihm von anderen Anwendungen her vertraut sind. chliche Sicherheits-Merkmal. Somit gibt es zwei identische CPUs mit ebenfalls identischer Sicherheits-E/APeripherie.

The maximum element out of "n" computed localization functions gives an indication of the failed sensor measurement axis (where only single-axis failures are considered). A failure status word is set accordingly. Since two-axis gyros are considered here, there is a certain likelihood of simultaneous two-axis failures in one channel. 6. 5. 6. DECISION FUNCTION The outputs of the HMS failure detection stages mentioned before are fed to the decision function where a decision about invalid sensors is made and valid sensors are selected for further data processing.

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