FMEDA在功能安全温度变送器验证中的应用

Application of FMEDA in Verification of Functional Safety Temperature Transmitter

失效模式、影响及其诊断分析(FMEDA)法在功能安全工作中起到很重要的作用,它对功能安全产品的失效风险、是否可诊断进行定性分析,同时也为平均失效概率和安全完整性等级的计算提供了有效的数据支撑。首先对FMEDA分析法进行了系统性归纳,确定了分析的依据,提出了完整的分析步骤。然后以功能安全温度变送器为例,从简单元器件和复杂元器件两个方面出发,阐述了FMEDA分析法的实际运用情况。最后根据相关的验证结果证明了功能安全温度变送器的硬件设计符合功能安全完整性等级的要求。

Failure modes effects and diagnostic analysis （ FMEDA ） plays a very important role in functional safety, it can qualitatively analyze if the failure risk of the functional safety products can be diagnosed or not, and it provides effective support to the calculation of average failure rate and safety integrity level. Firstly, the FMEDA is summarized systematically, the basis of analysis is determined, and the complete analysis step is proposed. Then, with the functional safety temperature transmitter as example, the practical use situation of FMEDA is described from two of the aspects, i. e. , simple components and complex components. Finally, based on relevant verifying results, it is proved that the hardware design of functional safety temperature transmitter meets the requirements of safety integrity level.