GB/T 20438.1-2017Functional safety of electrical/electronic/programmable electronic safety-related systems -- Part 1: General requirements (English PDF)

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 1 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 20438.1-2006 "Functional safety of

electrical/electronic/programmable electronic safety-related systems - Part 1.

General requirements". Compared with GB/T 20438.1-2006, the major

technical changes are as follows.

-- Add the requirements for the competence of persons in management of

functional safety (see Clause 6);

-- Add the E/E/PE system safety requirements specification phase in the

overall safety lifecycle (see 7.10);

-- Modify the evaluation method for evaluating independence (see Clause 8).

This Part uses the translation method to equivalently adopt IEC 61508-1.2010

"Functional safety of electrical/electronic/programmable electronic safety-

related systems - Part 1.General requirements".

This Part was proposed by China Mechinery 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., China

Academy of Safety Science and Technology, Shanghai Institute of Process

Automation & Instrumentation, Hangzhou Hollysys Automation 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. Feng Xiaosheng, Xiong Wenze, Pan Gang, Shi Xueling,

Wu Zongzhi, Luo An, Zhou Youzheng, Yang Liu, Fang Laihua, Li Jiajia, Li Jia,

Zheng Wei, Zhang Long, Wang Haiqing, Meng Zouqing, Mei Hao.

The previous versions of the standards which are replaced by this Part.

-- GB/T 20438.1-2006.

1 Scope

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.

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 20438.2-2017, 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)

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 following equipment and materials shall be used.

GB/T 20438 specifies the requirements for E/E/PE safety-related systems

and has been developed to meet the full range of complexity associated with

such systems.

5 Documentation

The information to be documented shall be as stated in the various

clauses of this standard unless justified or shall be as specified in the product

or application sector standard relevant to the application

6 Management of functional safety

Suppliers providing products or services to an organization having

overall responsibility for one or more phases of the overall, E/E/PE system or

software safety lifecycles (see 6.2.1), shall deliver products or services as

specified by that organization and shall have an appropriate quality

management system.

7 Overall safety lifecycle requirements

Where failures of the EUC control system place a demand on one or

more E/E/PE safety-related systems and/or other risk reduction measures, and

where the intention is not to designate the EUC control system as a safety-

related system, the following requirements shall apply.

8 Functional safety assessment

The objective of the requirements of this clause is to specify the activities

necessary to investigate and arrive at a judgement on the adequacy of the

functional safety achieved by the E/E/PE safety-related system(s) or compliant

items (e.g., elements/subsystems) based on compliance with the relevant

clauses of GB/T 20438.

Annex A

(Informative)

Example of a documentation structure

This annex provides an example documentation structure and method for

specifying the documents for structuring the information in order to meet the

requirements in Clause 5.

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