标准摘要
[中文适用范围]： 1.1 本部分提供以下信息： －－风险的基础概念和风险与安全完整性之间的关系（见附录A）; －－提供能去顶E/E/PE安全相关系统、其他技术安全相关系统和外部风险降低设施的安全完整性等级的一系列方法（见附录B、附录C、附录D和附录E）。 1.2 方法的选择应依赖应用领域和特定环境。附录B、附录C、附录D和附录E列出了定性和定量的方法并为说明基础的原理已进行简化。这些附录已包括在说明一系列方法的通用原理中但不提供明确的计算。 如使用附录中提到的方法需查询有关原始材料。 注：如想获得更多附录B、附录D和附录E中说明的方法的有关信息，参见参考文献中的【4】、【2】和【3】。对于附加的方法的描述参见参考文献中的【5】. 1.3 图1 表示了GB/T 20438的整体框架， 同时明确了在达到E/E/PE安全相关系统功能安全过程中本部分的作用。 [外文原描述]： Provides information on the underlying concepts of risk and the relationship of risk to safety integrity (see annex A); a number of methods that will enable the safety integrity levels for the E/E/PE safety-related systems, other technology safety-related systems and external risk reduction facilities to be determined (see annexes, B, C, D and E) Intended for use by technical committees in the preparation of standards in accordance with the principles contained in IEC Guide 104 and ISO/IEC Guide 51. IEC 61508 is also intended as a stand-alone standard. The contents of the corrigendum of April 1999 have been included in this copy.
英文名称Functional safety of electrical/electronic/programmable electronic safety related systems - Part 5: Examples of methods for the determination of safety integrity levels (see www.iec.ch/61508)