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Computer architectures and safety integrity level apportionment

机译:计算机体系结构和安全完整性级别分配

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摘要

Currently, technical systems are becoming more and more complex. A main contribution comes from electronic control systems that allow for a larger number of functions. The concept of Safety Integrity Levels (SILS) has been developed within different systems of standards (IEC 61508, EN 50129 / EN 50128 and DEF-STAN 00-56). These standards are applied in different areas: control technology (IEC 61508), railway technology (EN 50129 and EN 50128) and defence technology (DEF-STAN 00-56). SILs are a tool for assigning safety targets to systems. The concept of a safety SIL within different standards is explained. The problem of assigning SILS to functional units within a system is discussed, especially how a SIL is realised by a certain safety architecture of a system. Some standards give rules for system architecture and how to achieve a higher SIL for a system designed from constituents that have a lower SIL. Examples for system architectures and SIL assignment are given. For all systems, a choice of SILs for hardware and software is discussed and the problems arising are described.
机译:当前,技术系统变得越来越复杂。主要的贡献来自允许更多功能的电子控制系统。安全完整性级别(SILS)的概念是在不同的标准系统(IEC 61508,EN 50129 / EN 50128和DEF-STAN 00-56)中开发的。这些标准适用于不同领域:控制技术(IEC 61508),铁路技术(EN 50129和EN 50128)和国防技术(DEF-STAN 00-56)。 SIL是为系统分配安全目标的工具。说明了不同标准内的安全SIL的概念。讨论了将SILS分配给系统中的功能单元的问题,尤其是如何通过系统的某个安全体系结构实现SIL。一些标准给出了系统架构的规则,以及如何针对由具有较低SIL的组件设计的系统实现更高的SIL。给出了系统架构和SIL分配的示例。对于所有系统,都讨论了用于硬件和软件的SIL选择,并描述了出现的问题。

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