Safety integrity evaluation framework for fault-tolerant control logic according to IEC 61508
This paper presents a safety integrity evaluation framework for a control logic designed especially by a fault-tolerant control logic design technique according to the international safety standard, IEC 61508. The framework is based on demand frequency on safety-related systems from a control system. It clarifies a concrete contribution of fault-tolerant control logic to risk reduction.
KeywordsProbability Density Function Control Logic Reference Case Demand Rate Tolerable Risk
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