Automatic allocation of safety integrity levels

ABSTRACT

In this paper, we describe a concept for the automatic allocation of general Safety Integrity Levels (SILs) to subsystems and components of complex hierarchical networked architectures that deliver sets of safety critical functions. The concept is generic and can be adapted to facilitate the safety engineering approach defined in several standards that employ the concept of integrity or assurance levels including ISO 26262, the emerging automotive safety standard. SIL allocation is facilitated by HiP-HOPS, an automated safety analysis tool, and can be performed in the context of development using EAST-ADL2, an automotive architecture description language. The process rationalizes complex risk allocation and leads to optimal/economic allocation of SILs.

References

1. Int'l Organization for Standardization: ISO/DIS 26262 2009.
2. Papadopoulos, Y., McDermid, J. A., Sasse R., and Heiner, G. 2001. Analysis and Synthesis of the Behaviour of Complex Systems in Conditions of Failure. Reliability Engineering and System Safety, 71(3):229--247, Elsevier.
3. Misumi, Y., Sato, Y. 1999. Estimation of average hazardous-event-frequency for allocation of safety-integrity levels. Reliability Engineering & System Safety, 66:135--144.
4. Chen D., Johansson R., Lönn H., Papadopoulos Y., Sandberg A., Törner F., Törngren M. 2008. Modelling Support for Design of Safety-Critical Automotive Embedded Systems, SAFECOMP 2008, LN CS 5219:72--85, Springer.
5. Y. Laarouchi, Y. Deswarte, D. Powell, J. Arlat and E. De Nadaï, Connecting Commercial Computers to Avionics Systems", 28th IEEE/AIAA Digital Avionics Systems Conference (DASC), Orlando, pp. 6.D.1-1--6.D.1-9, 2009.

Index Terms

• Computer systems organization

  • Dependable and fault-tolerant systems and networks

• General and reference

  • Cross-computing tools and techniques

    • Performance

• Networks

  • Network performance evaluation