GB/T 20438.2-2017 PDF English
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Functional safety of electrical/electronic/programmable electronic safety-related systems -- Part 2: Requirements for electrical/electronic/programmable electronic safety-related systems
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GB/T 20438.2-2017: Functional safety of electrical/electronic/programmable electronic safety-related systems -- Part 2: Requirements for electrical/electronic/programmable electronic safety-related systems
---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GBT20438.2-2017
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 25.040
N 10
GB/T 20438.2-2017 / IEC 61508-2.2010
Replacing GB/T 20438.2-2006
Functional safety of electrical / electronic /
programmable electronic safety-related systems - Part
2.Requirements for electrical / electronic /
programmable electronic safety-related systems
(IEC 61508-2.2010, 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... 10
3 Definitions and abbreviations... 12
4 Conformance to GB/T 20438... 12
5 Documentation... 12
6 Management of functional safety... 12
7 E/E/PE system safety lifecycle requirements... 12
7.1 General... 12
7.2 E/E/PE system design requirements specification... 17
7.3 E/E/PE system safety validation planning... 20
7.4 E/E/PE system design and development... 21
7.5 E/E/PE system integration... 52
7.6 E/E/PE system operation and maintenance procedures... 54
7.7 E/E/PE system safety validation... 56
7.8 E/E/PE system modification... 58
7.9 E/E/PE system verification... 59
8 Functional safety assessment... 61
Annex A (Normative) Techniques and measures for E/E/PE safety-related
systems - control of failures during operation... 62
Annex B (Normative) Techniques and measures for E/E/PE safety-related
systems - avoidance of systematic failures during the different phases of the
lifecycle... 78
Annex C (Normative) Diagnostic coverage and safe failure fraction... 87
Annex D (Normative) Safety manual for compliant items... 92
Annex E (Normative) Special architecture requirements for integrated circuits
(ICs) with on-chip redundancy... 95
Annex F (Informative) Techniques and measures for ASICs - avoidance of
systematic failures... 103
Bibliography... 112
Foreword
GB/T 20438 "Functional safety of electrical/electronic/programmable electronic
safety-related systems” is divided into 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 2 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 20438.2-2006 "Functional safety of
electrical/electronic/programmable electronic safety-related systems - Part 2.
Requirements for electrical/electronic/programmable electronic safety-related
systems". Compared with GB/T 20438.2-2006, the major technical changes are
as follows.
-- Add ASIC development lifecycle (see Figure 3);
-- Add safety manual for compliant items (see Annex D).
This Part uses the translation method to equivalently adopt IEC 61508-2.2010
"Functional safety of electrical/electronic/programmable electronic safety-
related systems - Part 2.Requirements for electrical/electronic/programmable
electronic safety-related systems".
This Part was proposed by China Machinery Industry Federation.
This Standard shall be under the jurisdiction of National Technical Committee
124 on Industrial Process Measurement and Control of Standardization
Administration of China (SAC/TC 124).
The drafting organizations of this Part. Instrumentation Technology and
Economy Institute, Beijing SP Zhishen Control Technology Co., Ltd., Pilz
Industrial Automation Trading (Shanghai) Co., Ltd., Shanghai Institute of
Process Automation & Instrumentation, Beijing Hollysys System Engineering
Co., Ltd., Omron Industrial Automation (China) Co., Ltd., Siemens Ltd. China,
ZONHO Electronic Technology Research and Design Institute of Shanghai.
The drafters of this Part. Shi Xueling, Tian Yucong, Feng Xiaosheng, Huang
Zhijiong, Zhang Aisen, Zheng Wei, Zhou Youzheng, Hua Rong, Luo An, Xiong
Wenze, Yang Liu, Li Jia, Mei Hao, Zhou Chunjie, Xu Aidong, Qian Datao, Meng
Zouqing, Liu Yao, Wang Deji.
The previous versions of the standards which are replaced by this Part are.
-- GB/T 20438.2-2006.
1 Scope
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.
2 Normative references
The following referenced documents are indispensable for the application of
this document. For dated references, only the edition cited applies. For undated
references, the latest edition of the referenced document (including any
amendments) applies.
GB/T 20438.1-2017, Functional safety of electrical/electronic/programmable
electronic safety-related systems - Part 1.General requirements (IEC 61508-
1.2010, IDT)
3 Definitions and abbreviations
For the purposes of this document, the definitions and abbreviations given in
GB/T 20438.4-2017 apply.
4 Conformance to GB/T 20438
The requirements for conformance to this part are as detailed in Clause 4 of
GB/T 20438.1-2017.
5 Documentation
The requirements for documentation are as detailed in Clause 5 of GB/T
20438.1-2017.
6 Management of functional safety
The requirements for management of functional safety are as detailed in Clause
6 of GB/T 20438.1-2017.
7 E/E/PE system safety lifecycle requirements
When quantifying the effect of random hardware failures of a subsystem,
having a hardware fault tolerance of 0, and which is implementing a safety
function, or part of a safety function, operating in high demand mode or
continuous mode of operation, credit shall only be taken for the diagnostics if.
8 Functional safety assessment
The requirements for functional safety assessment are as detailed in Clause 8
of GB/T 20438.1-2017.
Annex A
(Normative)
Techniques and measures for E/E/PE safety-related systems -
control of failures during operation
This annex shall be used in conjunction with 7.4.
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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