Probabilistic safety assessment of control laws based on IEC standards

Author:	Suyama Koichi, Tokyo University of Marine Science and Technology, Japan
Topic:	6.4 Safeprocess
Session:	Fault Tolerant Control
Keywords:	safety, standards, control laws, Markov models, fault-tolerant systems

Abstract

This paper presents a probabilistic safety assessment framework based on the international safety standard, IEC 61508, for control laws designed especially by reliable control theory. The framework uses Markov techniques summarized in IEC 61165 to take restoration of control devices into consideration. It clarifies a concrete contribution of reliable control to risk reduction required in IEC 61508.