V&V Considerations In Implementing IEC61508-3
•
0 likes•553 views
This document discusses verification and validation considerations for implementing IEC 61508-3. It begins with an overview of Oak Systems, a specialist in software verification and validation services. It then provides an overview of IEC 61508-3 and verification and validation (V&V). The rest of the document discusses the IEC 61508 safety lifecycle, key terms and definitions, safety integrity levels, development activities and tools to support V&V, software verification techniques, functional safety assessment, and tables relating technique rigor to safety integrity levels. It concludes that IEC 61508 alone may not be sufficient for all applications and other standards like UL1998 may also need to be considered.
More Related Content
What's hot
What's hot (20)
Viewers also liked
Viewers also liked (20)
Similar to V&V Considerations In Implementing IEC61508-3
Similar to V&V Considerations In Implementing IEC61508-3 (20)
More from Oak Systems
More from Oak Systems (16)
Recently uploaded
Recently uploaded (20)
V&V Considerations In Implementing IEC61508-3
- 1. V&V Considerations In Implementing IEC61508-3 Hanumath Managoli Oak Systems Pvt Ltd. 1 / oaksys / Oak-systems / oaksystesting / oaksys
- 2. Agenda Overview of Oak Systems Overview of IEC61508-3, VnV Q&A 2
- 3. Overview of Oak Systems Specialist Software V&V Services company Established in 1998 ISO 9001 certified since 2003 Over 100 Software specialists Multiple domain expertise Headquartered in Bengaluru; Projects across several countries 3
- 4. Our Portfolio 4 Domains Aerospace & Defence Automotive Embedded Healthcare Rail & Space Services Software Verification & Validation Test Rig Development Software Testing & Test Automation Full lifecycle Documentation Support Standards DO-178B/C ISO 26262 IEEE 12207 IEC 61508..
- 5. IEC-61508 5
- 6. IEC-61508 – Safety Cycle 6
- 7. IEC-61508 – Safety Cycle - Realization 7
- 8. 8 Some terms & definitions Safety This is freedom from unacceptable risk of physical injury or of damage to the health of people, either directly, or indirectly Functional safety is part of the overall safety that depends on a system or equipment operating correctly in response to its inputs Safety function requirements what the function does (from hazard analysis) Safety integrity requirements The likelihood of a safety function being performed satisfactorily (from risk assessment)
- 9. 9 Safety Integrity Levels SIL: Proportional to rigors of requirement Derived at System level and assigned to Software/Hardware Result of HAZOP, Risk Analysis
- 10. 10 While Developing… • Requirements phase: Structured representation Formal methods, including mathematical representation Semi-formal: Methods include truth-tables, decision tables, information flow sequence charts, data flow diagrams, states and modes transition diagrams listing the possible states and the trigger events Computer-aided documentation tools that include model oriented representation •
- 11. 11 While Developing… • Design and development: Structured design Re-use of ‘proven-in-use’ components Computer-aided design tool, including model-based methods and simulation techniques FMEA, Fault-tree analysis and corresponding Fault Detection, Isolation and Recovery (FDIR) Strongly typed programming language, proven tools like compilers Auto-code generators Defensive programming Design, coding standards, guidelines and best practices •
- 12. 12 Tools • In-house, COTS, vendor, other (open-source) • Classification: on-the-fly Off-line • Qualification
- 13. 13 Software Verification • Are there test cases to present events to system in random order and random frequency and also at definite points of time and in different and wrong sequences? • Are there tests to check concurrency issues? (invoking different interrupts at the same instance, invoking interrupts consecutively with different order - different chains of interrupts, invoking different tasks with different amount of resource availability)
- 14. 14 Software Verification • Plan it out – in parallel with development • Tools, Techniques and Strategies • For each phase - Good to go for the next phase • Results, deviations documented • Verification of life-cycle artifacts; and testing • Data verification
- 15. 15 Functional Safety Assessment • Competent Personnel allocation • Access to project-associate members and relevant resources • Assessment applies to all phases and relevant artifacts • Includes suppliers and their claims of compliance • Covers FA audit reports • Recommendations and resolutions from previous FA • Report • Level of independence
- 17. 17 T & M • A: Normative: Selection of Techniques and Measures • B: Informative – detailing (adding to A) • C: Software Systematic Capability (adding to A, B)
- 18. 18 Software Aspects of System Safety
- 21. 21 Verification – TableC: Rigour & SIL
- 22. 22 Before Concluding • Assessment • Certification • 61508 alone may not be enough – white goods, energy equip UL1998 (in the US)
- 24. Thank you! Oak Systems Pvt. Ltd. #27, NGEF Lane, Off 100 Feet Road, Indira Nagar, Bangalore – 560 038, INDIA Tel : +91-80-41 26 76 81 Email: contact@oaksys.net URL: www.oaksys.net 24