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GB/T 20438.7-2017 PDF English


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GB/T 20438.7-2017: PDF in English (GBT 20438.7-2017)

GB/T 20438.7-2017 GB NATIONAL STANDARD OF THE PEOPLE’S REPUBLIC OF CHINA ICS 25.040 N 10 GB/T 20438.7-2017 / IEC 61508-7:2010 Replacing GB/T 20438.7-2006 Functional safety of electrical / electronic / programmable electronic safety-related systems - Part 7: Overview of techniques and measures (IEC 61508-7:2010, IDT) ISSUED ON: DECEMBER 29, 2017 IMPLEMENTED ON: JULY 01, 2018 Issued by: General Administration of Quality Supervision, Inspection and Quarantine; Standardization Administration of the People's Republic of China. Table of Contents Foreword ... 3  Introduction ... 5  1 Scope ... 8  2 Normative references ... 9  3 Definitions and abbreviations ... 10  Annex A (informative) Overview of techniques and measures for E/E/PE safety- related systems: control of random hardware failures (see GB/T 20438.2) ... 11  Annex B (informative) Overview of techniques and measures for E/E/PE safety related systems: avoidance of systematic failures (see GB/T 20438.2 and GB/T 20438.3) ... 33  Annex C (informative) Overview of techniques and measures for achieving software safety integrity (see GB/T 20438.3) ... 69  Annex D (informative) A probabilistic approach to determining software safety integrity for pre-developed software ... 138  Annex E (informative) Overview of techniques and measures for design of ASICs ... 144  Annex F (informative) Definitions of properties of software lifecycle phases 163  Annex G (informative) Guidance for the development of safety-related object- oriented software ... 169  Bibliography ... 171  Index ... 174  Foreword GB/T 20438 "Functional safety of electrical/electronic/programmable electronic safety-related systems" consists of the following seven parts: - Part 1: General requirements; - Part 2: Requirements for electrical/electronic/programmable electronic safety-related systems; - Part 3: Software requirements; - Part 4: Definitions and abbreviations; - Part 5: Examples of methods for the determination of safety integrity levels; - Part 6: Guidelines on the application of GB/T 20438.2 and GB/T 20438.3; - Part 7: Overview of techniques and measures. This Part is Part 7 of GB/T 20438. This Part was drafted in accordance with the rules given in GB/T 1.1-2009. This Part replaces GB/T 20438.7-2006 "Functional safety of electrical/electronic/programmable electronic safety-related systems - Part 7: Overview of techniques and measures". Compared with GB/T 20438.7-2006, the main technical changes in this Part are as follows: - add Overview of techniques and measures for design of ASICs (see Annex E); - add Definitions of properties of software lifecycle phases (see Annex F); - add Guidance for the development of safety-related object-oriented software (see Annex G). This Part uses translation method to identically adopt IEC 61508-7:2010 "Functional safety of electrical/electronic/programmable electronic safety- related systems - Part 7: Overview of techniques and measures". This Part was proposed by China Machinery Industry Federation. This Part shall be under the jurisdiction of National Technical Committee on National Industrial Process Measurement Control and Automation of Standardization Administration of China (SAC/TC 124). Functional safety of electrical / electronic / programmable electronic safety-related systems - Part 7: Overview of techniques and measures 1 Scope 1.1 This Part of GB/T 20438 contains an overview of various safety techniques and measures relevant to GB/T 20438.2 and GB/T 20438.3. The references should be considered as basic references to methods and tools or as examples, and may not represent the state of the art. 1.2 GB/T 20438.1, GB/T 20438.2, GB/T 20438.3 and GB/T 20438.4 are basic safety publications, although this status does not apply in the context of low complexity E/E/PE safety-related systems (see 3.4.3 of GB/T 20438.4-2017). As basic safety publications, they are 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. GB/T 20438.1, GB/T 20438.2, GB/T 20438.3 and GB/T 20438.4 are also intended for use as stand-alone publications. The horizontal safety function of GB/T 20438 does not apply to medical equipment in compliance with the IEC 60601 series. 1.3 One of the responsibilities of a technical committee is, wherever applicable, to make use of basic safety publications in the preparation of its publications. In this context, the requirements, test methods or test conditions of this basic safety publication will not apply unless specifically referred to or included in the publications prepared by those technical committees. 1.4 Figure 1 shows the overall framework for GB/T 20438 and indicates the role that this Part plays in the achievement of functional safety for E/E/PE safety- related systems. ......
 
Source: Above contents are excerpted from the PDF -- translated/reviewed by: www.chinesestandard.net / Wayne Zheng et al.