GB/T 20438.3-2017Functional safety of electrical/electronic/programmable electronic safety-related systems -- Part 3: Software requirements (English PDF)

Foreword

GB/T 20438 Functional Safety of Electrical/Electronic/Programmable Electronic Safety-

Related Systems can be divided into the following 7 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 3 of GB/T 20438.

This Part was drafted as per the rules specified in GB/T 1.1-2009.

This Part replaced GB/T 20438.3-2006 Functional Safety of

Electrical/Electronic/Programmable Electronic Safety-Related Systems - Part 3.Software

Requirements. Compared with GB/T 20438.3-2006, the major technical changes of this

Standard are as follows.

--- Add the attributes of the software's systematic capabilities (see Annex C of this Edition);

--- Add additional requirements for compliance item safety manual - software components

(see Annex D of this Edition);

--- Add the relationship between GB/T 20438.2 and GB/T 20438.3 (see Annex E of this

Edition);

---Add a technology for non-interference between software components in a single

computer (see Annex F of this Edition);

--- Add life cycle tailoring guidelines for data-driven systems (see Annex G of this Edition).

This Part uses translation method to equivalently adopt IEC 61508-3.2010 Functional Safety

of Electrical/Electronic/Programmable Electronic Safety-Related Systems - Part 3.Software

Requirements.

This Part was proposed by China Machinery Industry Federation.

This Part shall be under the jurisdiction of National Technical Committee on Industrial

Process Measurement, Control and Automation of Standardization (SAC/TC 124).

Drafting organizations of this Part. Instrumentation Technology and Economy Institute of

China; Beijing SP Zhishen Control Technology Co., Ltd.; Shanghai Institute of Process

Automation & Instrumentation; Pilz Industrial Automation Trading (Shanghai) Co., Ltd.;

Beijing HollySys Co., Ltd.; Omron Industrial Automation (China) Co., Ltd.; Siemens (China)

Co., Ltd.; and Zonho Electronics Co., Ltd.

Chief drafting staffs of this Part. Feng Xiaosheng, Xia Ming, Xiong Wenze, Shi Xueling, Zhou

Youzheng, Yang Liu, Huang Zhijiong, Luo An, Zhuang Lingyun, Li Jia, Liu Xiaodong, Mei

Hao, Hua Rong, Zhang Long, Ye Jun, Chu Weizhong, Qiu Kun, Meng Zouqing, Xiao Jiaqi,

and Wang Deji.

The historical edition replaced by this Part is as follows.

--- GB/T 20438.3-2006.

1 Scope

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.

2 Normative References

The following documents are essential to the application of this document. For the dated

documents, only the versions with the dates indicated are applicable to this document; for

the undated documents, only the latest version (including all the amendments) is applicable

to this document.

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 this Standard

The requirements for conformance of this Part to GB/T 20438 are given in Clause 4 of GB/T

20438.1-2017.

5 Documentation

The objectives and requirements for documentation are given in Clause 5 of GB/T 20438.1-

2017.

6 Additional Requirements for Management of Safety- Related Software

The objectives are as detailed in 6.1 of GB/T 20438.1-2017.

The requirements are as detailed in 6.2 of GB/T 20438.1-2017, with the following

additional requirements.

7 Software Safety Lifecycle Requirements

The objective of the requirements of 7.6 is to provide information and procedures concerning

software necessary to ensure that the functional safety of the E/E/PE safety-related system

is maintained during operation and modification.

The objective of the requirements of 7.7 is to ensure that the integrated system complies

with the software safety requirements specification at the required safety integrity level.

8 Functional Safety Assessment

For the selection of appropriate techniques and measures (see Annexes A and B) to

implement the requirements of this clause, the following properties (see Annex C for guidance on

interpretation of properties, and Annex F of GB/T 20438.7-2017 for informal definitions) of the

functional safety assessment should be considered.

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