Abstract
The concept of Safety Integrity Level (SIL) has been developed within different systems of standards (IEC 61508, EN50129 and DEF-STAN 00-56). These standards are applied in different areas: control technology (IEC 61508), railway technology (EN50128 and EN 50129), and defense technology (DEF-STAN-00-56). Nowadays, a lot of the mass transit turnkey projects around the world demand the contractors to follow CENELEC standards and SIL concept for the safety function implementation. Although the concept of SIL is mentioned in these standards, the interpretation of the concept of SIL in these standards is not consistent and unequivocal. This paper is written to elaborate the anomalies of SIL interpretation among these various standards in order for safety engineers to obtain a more detailed view on the concept of SIL over these standards.
Highlights
The CENELEC standard EN50126 have attracted increasingly more widespread attention as international railways applied safety standards since the 1990s
Summary IEC61508 and CENELEC standards EN50126, EN50128 and EN50129 all emphasize the engineering processes to defend against systematic failure
The product safety life cycle process requirements are intended to ensure a sufficient level of the safety integrity against systematic faults
Summary
The CENELEC standard EN50126 have attracted increasingly more widespread attention as international railways applied safety standards since the 1990s. Except for some software integrity levels in IEEE standards, SIL have not been used in the US rail and mass transit industry. The software could be developed to achieve one of four levels of safety integrity by using techniques from the correspondingly ranked group at each stage of the software life cycle.
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