| 安全控制系统的设计思想 |
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| 引用本文： | 张钊谦,吴重光.安全控制系统的设计思想[J].安全与环境学报,2002,2(6):23-25. |
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| 作者姓名： | 张钊谦 吴重光 |
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| 作者单位： | 北京化工大学信息科学与技术学院,北京,100029 |
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| 摘 要： | 介绍了安全控制领域的国际标准IEC61508.给出了安全整体性要求的4个等级(SIL)相应的技术指标.从硬件故障的控制、系统故障的避免及安全系统软件的设计3个方面阐述了安全控制系统的设计思想.对硬件故障控制中的1oo2D和2oo3系统进行了比较,给出了相应的SIL计算方法.针对避免系统故障,提出了系统设计的6条原则和方法.介绍了 3种面向过程控制和对实时性要求较高的安全系统软件的设计方法.
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| 关 键 词： | 安全工程 安全控制系统 安全系统设计 系统故障 软件设计 |
| 文章编号： | 1009-6094(2002)06-0023-03 |
| 修稿时间： | 2002年5月27日 |
DESIGN CONSIDERATIONS ON SAFETY-RELATED SYSTEM |
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| ZHANG Zhao-qian,WU Chong-guang.DESIGN CONSIDERATIONS ON SAFETY-RELATED SYSTEM[J].Journal of Safety and Environment,2002,2(6):23-25. |
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| Authors: | ZHANG Zhao-qian WU Chong-guang |
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| Abstract: | IEC61508 is the newest international standard in the field of safety control. The present paper introduces the IEC61508. The newest concept of Safety Integrity Level (SIL) mentioned in IEC61508 is discussed in detail. The Safety Integrity Level consists of four discrete probabilistic levels and the corresponding index. Based on IEC61508, the main technologies about designing safety-related system are given. They are control of random hardware failures, avoidance of systematic failures and software design. For control of random hardware failures, the two typical system architectures, 1oo2D and 2oo3, are compared with each other and the calculation method of SIL is also given. For avoidance of systematic failures, six principles popularly applied in system design are put forward. Finally, three process-oriented and highly real-timed software design methods are introduced and all these three are applicable for high-safety system design. |
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| Keywords: | safety engineering safety control system safety system design systematic failures software design |
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