Sophisticated Calculation of the 1oo4-architecture for Safety-related Systems Conforming to IEC61508

Abstract

Abstract.With the publication and enforcement of the standard IEC 61508 of safety related systems, recent system architectures have been presented and evaluated. Among a number of techniques and measures to the evaluation of safety integrity level (SIL) for safety-related systems, several measures such as reliability block diagrams and Markov models are used to analyze the probability of failure on demand (PFD) and mean time to failure (MTTF) which conform to IEC 61508. The current paper deals with the quantitative analysis of the novel 1oo4-architecture (one out of four) presented in recent work. Therefore sophisticated calculations for the required parameters are introduced. The provided 1oo4-architecture represents an advanced safety architecture based on on-chip redundancy, which is 3-failure safe. This means that at least one of the four channels have to work correctly in order to trigger the safety function.

Research on Safe Communication Architecture for Real-Time Ethernet Distributed Control System

“…Based on IEC61508 [21], [22], ISO26262 [23], [24] and IEC62443 [25], [26] standards, SESAMO method could be used to design the safe architecture of network embedded system for functional security and information security. And, the formal modeling method could be used for modeling, simulation and verification of architecture.…”

Sophisticated Calculation of the 1oo4-architecture for Safety-related Systems Conforming to IEC61508

“…A dangerous breakdown of the system is generated if three of the four channels have dangerous failures themselves. From the fault-tree-analysis [6], we can determine when the system can go to the dangerous non safety state:…”