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GB/T 20438.2-2017 English PDF (GBT20438.2-2017)

GB/T 20438.2-2017 English PDF (GBT20438.2-2017)

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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

GB/T 20438.2-2017
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 Functional safety of electrical / electronic /
programmable electronic safety-related systems - Part
2 : Requirements for electrical / electronic /
programmable electronic safety-related systems
1 Scope
1.1 This part of the GB/T 20438 series
a) is intended to be used only after a thorough understanding of GB/T
20438.1, which provides the overall framework for the achievement of
functional safety;
b) applies to any safety-related system, as defined by GB/T 20438.1, that contains at least one electrical, electronic or programmable electronic element;
c) applies to all elements within an E/E/PE safety-related system (including sensors, actuators and the operator interface);
d) specifies how to refine the E/E/PE system safety requirements
specification, developed in accordance with GB/T 20438.1 (comprising
the E/E/PE system safety functions requirements specification and the
E/E/PE system safety integrity requirements specification), into the
E/E/PE system design requirements specification;
e) specifies the requirements for activities that are to be applied during the design and manufacture of the E/E/PE safety-related systems (i.e.
establishes the E/E/PE system safety lifecycle model) except software,
which is dealt with in GB/T 20438.3 (see Figures 2 to 4). These
requirements include the application of techniques and measures that are graded against the safety integrity level, for the avoidance of, and control of, faults and failures;
f) specifies the information necessary for carrying out the installation, commissioning and final safety validation of the E/E/PE safety-related
systems;
g) does not apply to the operation and maintenance phase of the E/E/PE
safety-related systems - this is dealt with in GB/T 20438.1 - however, this part does provide requirements for the preparation of information and

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