GB/T 20438.7-2017 English PDF (GBT20438.7-2017)

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GB/T 20438.7-2017: Functional safety of electrical/electronic/programmable electronic safety-related systems -- Part 7: Overview of techniques and measures
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.