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GB/T 20438.4-2017 PDF English

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GB/T 20438.4-2017: Functional safety of electrical/electronic/programmable electronic safety-related systems -- Part 4: Definitions and abbreviations
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GB/T 20438.4: Evolution and historical versions

Standard IDContents [version]USDSTEP2[PDF] deliveryName of Chinese StandardStatus
GB/T 20438.4-2017English415 Add to Cart 0-9 seconds. Auto-delivery Functional safety of electrical/electronic/programmable electronic safety-related systems -- Part 4: Definitions and abbreviations Valid
GB/T 20438.4-2006English959 Add to Cart 4 days Functional safety of electrical/electronic/programmable electronic safety-related systems -- Part 4: Definitions and abbreviations Obsolete

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GB/T 20438.4-2017: Functional safety of electrical/electronic/programmable electronic safety-related systems -- Part 4: Definitions and abbreviations


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GB NATIONAL STANDARD OF THE PEOPLE’S REPUBLIC OF CHINA ICS 25.040 N 10 GB/T 20438.4-2017 / IEC 61508-4:2010 Replacing GB/T 20438.4-2006 Functional safety of electrical / electronic / programmable electronic safety-related systems - Part 4: Definitions and abbreviations (IEC 61508-4:2010, IDT) Foreword ... 4 Introduction ... 6 1 Scope ... 9 2 Normative references ... 10 3 Definitions and abbreviations ... 11 3.1 Safety terms ... 12 3.2 Equipment and devices ... 14 3.3 Systems - general aspects ... 19 3.4 Systems - safety-related aspects ... 22 3.5 Safety functions and safety integrity ... 24 3.6 Fault, failure and error (see Figure 4) ... 28 3.7 Lifecycle activities... 36 3.8 Confirmation of safety measures ... 37 Bibliography ... 42 Index ... 44 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 ... 4 Introduction ... 6 1 Scope ... 9 2 Normative references ... 10 3 Definitions and abbreviations ... 11 3.1 Safety terms ... 12 3.2 Equipment and devices ... 14 3.3 Systems - general aspects ... 19 3.4 Systems - safety-related aspects ... 22 3.5 Safety functions and safety integrity ... 24 3.6 Fault, failure and error (see Figure 4) ... 28 3.7 Lifecycle activities... 36 3.8 Confirmation of safety measures ... 37 Bibliography ... 42 Index ... 44

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 4 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 20438.4-2006 "Functional safety of electrical/electronic/programmable electronic safety-related systems - Part 4: Definitions and abbreviations". Compared with GB/T 20438.4-2006, the main technical changes in this Part are as follows: - add the term and definition of "software on-line support tool" (see 3.2.10 and 3.2.11); - add the term and definition of "application specific integrated circuit" (see 3.2.15); - add the terms and definitions of "systematic safety integrity" and "systematic capability" (see 3.5.6 and 3.5.9); - add the terms and definitions of "no part failure" and "no effect failure" (see 3.6.13 and 3.6.14); - add the terms and definitions of "mean time to restoration" and "mean repair time" (see 3.6.21 and 3.6.22). This Part uses translation method to identically adopt IEC 61508-4:2010 "Functional safety of electrical/electronic/programmable electronic safety- related systems - Part 4: Definitions and abbreviations". Functional safety of electrical / electronic / programmable electronic safety-related systems - Part 4: Definitions and abbreviations

1 Scope

1.1 This Part of GB/T 20438 contains the definitions and explanation of terms that are used in GB/T 20438.1~GB/T 20438.7. 1.2 The definitions are grouped under general headings so that related terms can be understood within the context of each other. However, it should be noted that these headings are not intended to add meaning to the definitions. 1.3 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. 1.4 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. 1.5 Figure 1 shows the overall framework of the GB/T 20438 series 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 full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.


      

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