Fieldbus transmitters are commonly used in modern industrial productions, particularly in Safety Instrumented Systems (SIS). Safety and security are critical considerations in the design and operation of these transmitters. Previous research has tended to address safety issues and security issues separately, but with the increasing complexity of network technology, it is important to analyze them simultaneously. In this paper, a systematic framework for comprehensively analyzing random failures and cyber-attack failures is proposed. The framework adopts the FMEA-IMEA method, which combines Failure Modes and Effects Analysis (FMEA) and Intrusion Modes and Effects Analysis (IMEA), to analyze failure modes and effects of fieldbus transmitters. In addition, by extending Reliability Block Diagrams (RBD), the impact of random failures and cyber-attack failures on fieldbus transmitters is quantitatively determined. At the same time, calculation approach of the residual error rate (RER), Component counting method, and Monte Carlo are used to determine random failure rate and cyber-attack failure rate. Using fieldbus pressure transmitter and fieldbus temperature transmitter as examples, the results demonstrate that security issues can significantly impact the safety integrity level. In fact, the safety integrity level is reduced from SIL3 to SIL1 when cyber-attacks are considered. Compared to existing FMEA, the proposed approach offers a more comprehensive analysis of random failures and cyber-attack failures in fieldbus transmitters.

中文翻译：

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现场总线变送器安全保障综合故障分析方法研究

现场总线发射器常用于现代工业生产，特别是安全仪表系统 (SIS)。安全和安保是这些发射机设计和操作中的关键考虑因素。以往的研究倾向于分别解决安全问题和安保问题，但随着网络技术的日益复杂，同时分析它们变得很重要。本文提出了一个综合分析随机故障和网络攻击故障的系统框架。该框架采用FMEA-IMEA方法，结合故障模式和影响分析（FMEA）和入侵模式和影响分析（IMEA）来分析现场总线变送器的故障模式和影响。此外，通过扩展可靠性框图（RBD），可以定量确定随机故障和网络攻击故障对现场总线发射器的影响。同时，采用残差错误率（RER）计算方法、分量计数法和蒙特卡罗来确定随机故障率和网络攻击故障率。以现场总线压力变送器和现场总线温度变送器为例，结果表明安全问题会显着影响安全完整性水平。事实上，当考虑网络攻击时，安全完整性级别从 SIL3 降低到 SIL1。与现有的 FMEA 相比，所提出的方法可以对现场总线发射器中的随机故障和网络攻击故障进行更全面的分析。