Safety Integrity Level

Safety Integrity Level

Safety Integrity Level (SIL) определяет соответствующий уровень уменьшения опасности от возникновения аварий и катастроф, обеспечиваемый функционалом средств и систем повышенной безопасности или указывает целевой уровень уменьшения риска возникновения опасной ситуации.

Four SIL levels are defined, with SIL4 being the most dependable and SIL1 being the least. A SIL is determined based on a number of quantitative factors in combination with qualitative factors such as development process and safety life cycle management. The requirements for a given SIL are not consistent among all of the functional safety standards.

IEC 61508 и IEC 61511

The international standard IEC 61508 defines SIL using requirements grouped into two broad categories: hardware safety integrity and systematic safety integrity. A device or system must meet the requirements for "both " categories to achieve a given SIL.

The SIL requirements for hardware safety integrity are based on a probabilistic analysis of the device. To achieve a given SIL, the device must have less than the specified probability of dangerous failure and have greater than the specified safe failure fraction. These failure probabilities are calculated by performing a Failure Modes and Effects Analysis (FMEA). The actual targets required vary depending on the likelihood of a demand, the complexity of the device(s), and types of redundancy used.

The SIL requirements for systematic safety integrity define a set of techniques and measures required to prevent systematic failures (bugs) from being designed into the device or system. These requirements can either be met by establishing a rigorous development process, or by establishing that the device has sufficient operating history to argue that it has been proven in use.

Electric and electronic devices can be certified for use in functional safety applications according to IEC 61508, providing application developers the evidence required to demonstrate that the application including the device is also compliant.
IEC 61511 это специфическая отраслевая адаптация стандарта IEC 61508 для непрерывных процессов. Этот стандарт, помимо прочего, используется в нефтеперерабатывающей, нефтехемической и химической промышленности.

SIL в других стандартах

Следующие стандарты также используют понятие SIL (определяемое отлично от указанного), как меру надёжности или уменьшения риска:
*EN 50128
*EN 50129
*Defence Standard 00-56 Issue 2


* [ Fersil : Operational Safety: SIL Standards]
* [ IEC Functional safety zone]
* [ Functional Safety and IEC 61508: A basic guide]
* [ Overview of IEC 61508]
* [ DynaTorque D-Stop Partial Stroke Test Device]
* [ Safety Users Group] - Functional Safety-Information Resources

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Смотреть что такое "Safety Integrity Level" в других словарях:

  • Safety Integrity Level — (SIL) is defined as a relative level of risk reduction provided by a safety function, or to specify a target level of risk reduction. In simple terms, SIL is a measurement of performance required for a Safety Instrumented Function (SIF).Four SIL… …   Wikipedia

  • Safety Integrity Level — Demande de traduction Safety Integrity Level → …   Wikipédia en Français

  • Safety Integrity Level — Die Artikel Sicherheitssystem und Sicherheitsanforderungsstufe überschneiden sich thematisch. Hilf mit, die Artikel besser voneinander abzugrenzen oder zu vereinigen. Beteilige dich dazu an der Diskussion über diese Überschneidungen. Bitte… …   Deutsch Wikipedia

  • Safety Evidence Assurance Level — is a category of required evidence needed to assure stakeholders (e.g., safety certifiers) that a given system is sufficiently safe (i.e., that it has achieved its required Safety Integrity Level). References* …   Wikipedia

  • Safety instrumented system — A Safety Instrumented System (SIS) is a form of process control usually implemented in industrial processes, such as those of a factory or an oil refinery. The SIS performs specified functions to achieve or maintain a safe state of the process… …   Wikipedia

  • Safety life cycle — The safety life cycle is the series of phases from initiation and specifications of safety requirements, covering design and development of safety features in a safety critical system, and ending in decommissioning of that system. The basic… …   Wikipedia

  • INTEGRITY-178B — Infobox OS name = INTEGRITY 178B caption = developer = Green Hills Software source model = kernel type = supported platforms = ui = family = Real time operating systems latest release version = latest release date = marketing target = programmed… …   Wikipedia

  • Safety valve — A safety valve is a valve mechanism for the automatic release of a gas from a boiler, pressure vessel, or other system when the pressure or temperature exceeds preset limits. It is part of a bigger set named pressure safety valves (PSV) or… …   Wikipedia

  • Integrity (operating system) — Infobox OS name = INTEGRITY caption = developer = Green Hills Software source model = Closed Source kernel type = Microkernel supported platforms = ARM, XScale, Blackfin, Freescale ColdFire, MIPS, PowerPC, x86 ui = family = Real time operating… …   Wikipedia

  • Security and safety features new to Windows Vista — There are a number of security and safety features new to Windows Vista, most of which are not available in any prior Microsoft Windows operating system release.Beginning in early 2002 with Microsoft s announcement of their Trustworthy Computing… …   Wikipedia


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