IEC 61508. Functional safety of electrical/electronic/programmable electronic safety-related systems

2000 ◽  
Vol 11 (1) ◽  
pp. 3-5 ◽  
Keyword(s):  
Functional Safety ◽  
Iec 61508

Mathematical Approaches in Functional Safety Assessment for E/E/PE Safety-Related Software

2021 ◽  
pp. 2150043
Author(s):  
Shinji Inoue ◽  
Takaji Fujiwara ◽  
Shigeru Yamada
Keyword(s):  
Software Reliability ◽  
Safety Assessment ◽  
Assessment Method ◽  
Functional Safety ◽  
Reliability Modeling ◽  
Software Failure ◽  
Safety Integrity Level ◽  
Iec 61508 ◽  
Systematic Failure ◽  
Quantitative Safety Assessment

Safety integrity level (SIL)-based functional safety assessment is widely required in designing safety functions and checking their validity of electrical/electronic/programmable electronic (E/E/PE) safety-related systems after being issued IEC 61508 in 2010. For the hardware of E/E/PE safety-related systems, quantitative functional safety assessment based on target failure measures is needed for deciding or allocating the level of SIL. On the other hand, IEC 61508 does not provide any quantitative safety assessment method for allocating SIL for the software of E/E/PE safety-related systems because the software failure is treated as a systematic failure in IEC 61508. We discuss the needfulness of quantitative safety assessment for software of E/E/PE safety-related systems and propose mathematical fundamentals for conducting quantitative SIL-based safety assessment for the software of E/E/PE safety-related systems by applying the notion of software reliability modeling and assessment technologies. We show numerical examples for explaining how to use our approaches.

IEC 61508 — Understanding Functional Safety Assessment

1999 ◽  
Vol 32 (7) ◽  
pp. 201-204 ◽  
Author(s):  
Simon Dean
Keyword(s):  
Safety Assessment ◽  
Functional Safety ◽  
Iec 61508

scholarly journals Security Aspects in Verification of the Safety Integrity Level of Distributed Control and Protection Systems

2008 ◽  
Vol 6 (3) ◽  
pp. 25-40
Author(s):  
Barnert Tomasz ◽  
Kosmowski Kazimierz ◽  
Śliwiński Marcin
Keyword(s):  
Information Security ◽  
Distributed Control ◽  
Quantitative Method ◽  
Safety Analysis ◽  
Functional Safety ◽  
Entire System ◽  
Criterion Function ◽  
Safety Integrity Level ◽  
Iec 61508 ◽  
Protection Systems

Security Aspects in Verification of the Safety Integrity Level of Distributed Control and Protection SystemsThe article addresses some important issues of the functional safety analysis, namely the safety integrity level (SIL) verification of distributed control and protection systems with regard to security aspects. A quantitative method for SIL (IEC 61508) verification, based on so called differential factors, is presented. Taking into account SIL and the evaluation assurance level (EAL), which concerns the level of information security within entire system, two parametrical criterion function is defined for the SIL verification.

Research of CPU Functional Safety Based on IEC 61508

2020 ◽  
Author(s):  
Xige Zhang ◽  
Jun Liu ◽  
Dongyan Zhao ◽  
Ting Chong ◽  
Haifeng Zhang
Keyword(s):  
Functional Safety ◽  
Iec 61508

scholarly journals Errors, faults and failures

Dependability ◽  
2021 ◽  
Vol 21 (2) ◽  
pp. 24-27
Author(s):  
I. В. Shubinsky ◽  
Hendrik Schäbe
Keyword(s):  
International Standards ◽  
Functional Safety ◽  
Loss Of Function ◽  
Full Extent ◽  
International Standard ◽  
Software Errors ◽  
Iec 61508 ◽  
The Subject ◽  
Number Of Authors

Aim. To harmonize the definitions of errors, faults, failures in the Russian and English languages. The Object of the paper is one of the most important subject matters of the dependability theory and functional safety. The Subject of the paper is the concepts and definitions of failures, errors, faults.Results of the research: analysis of the definitions of the concepts describing the dependability and functional safety of items in the Russian and international standards, such as GOST 27.002-2015, GOST R/IEC 61508-2012, IEC 60050, DIN 40041, as well as in publications by a number of authors. The analysis shows that failure is always associated with the loss of function, i.e., the ability to perform as required by all standards. It should be noted that wrong user expectation does qualify as failure. A failure should be distinguished from unintended functions. A fault is defined as a system’s inability to perform the required operation to the full extent that, under certain conditions, may escalate into a failure. An error as a discrepancy between a calculated, observed or measured value or condition and a true, specified or theoretically correct value or condition is a deviation that is present and, under certain conditions, would probably turn into a failure. A typical example is non-critical software errors. The so-called systematic failures are actually errors that can turn into critical errors (failures). Let us note that the definitions in the IEC 60050 international electrotechnical vocabulary can be used, as they show general agreement, which is not surprising for an international standard.

scholarly journals Effect Of Selected Factors On The Safety Integrity Level (SIL)

2015 ◽  
Vol 35 (1) ◽  
pp. 85-98
Author(s):  
Młynarski Stanisław ◽  
Pilch Robert ◽  
Kaczor Grzegorz ◽  
Smolnik Maksymilian ◽  
Szkoda Maciej ◽  
...  
Keyword(s):  
Failure Rate ◽  
Safety Assessment ◽  
Repair Time ◽  
Functional Safety ◽  
Safety Level ◽  
Reliability Indicators ◽  
Safety Integrity Level ◽  
Iec 61508 ◽  
Technical Systems ◽  
The Impact

Abstract The presented paper concerns the functional safety problems of technical systems. The characteristics of safety assessment, described in IEC 61508 standard are an introduction to the problems associated with the methodology of the calculation of Safety Integrity Levels (SIL). The parameters obtained from reliability indicators, were calculated for the purpose of assessing the impact of repair time for the elements of a given system on the SIL. The calculated values of failure rate and the probability of dangerous failure show the sensitivity of the system at different time to repair values for various reliability-wise configurations. The indicators characterizing the safety level, calculated of the system with no repair time are the basis for demonstrating the influence of repair on the safety integrity level.

Sign in / Sign up

Export Citation Format

Share Document