GB/T 20438.6-2017 English PDF (GBT20438.6-2017)

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GB/T 20438.6-2017: Functional safety of electrical/electronic/programmable electronic safety-related systems -- Part 6: Guidelines on the application of GB/T 20438.2 and GB/T 20438.3
GB/T 20438.6-2017
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 25.040
N 10
GB/T 20438.6-2017 / IEC 61508-6:2010
Replacing GB/T 20438.6-2006
Functional Safety of Electrical / Electronic / Programmable
Electronic Safety-related Systems - Part 6: Guidelines on the
Application of GB/T 20438.2 and GB/T 20438.3
(IEC 61508-6:2010, Functional Safety of Electrical / Electronic /
Programmable Electronic Safety-related Systems - Part 6: Guidelines
on the Application of IEC 61508-2 and IEC 61508-3, IDT)
ISSUED ON: DECEMBER 29, 2017
IMPLEMENTED ON: JULY 1, 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 ... 10 
Annex A (informative) Application of GB/T 20438.2 and GB/T 20438.3 ... 11 
Annex B (informative) Example of Technique for Evaluating Probabilities of
Hardware Failure ... 22 
Annex C (informative) Calculation of Diagnostic Coverage and Safe Failure
Fraction - Worked Example ... 99 
Annex D (informative) A Methodology for Quantifying the Effect of Hardware-
related Common Cause Failures in E/E/PE Systems ... 103 
Annex E (informative) Example Applications of Software Safety Integrity Tables
of GB/T 20438.3 ... 124 
Bibliography ... 140 
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 is Part 6 of GB/T 20438.
This Part was drafted in accordance with the rules provided in GB/T 1.1-2009.
This Part serves as a replacement of GB/T 20438.6-2006 Functional Safety of
Electrical / Electronic / Programmable Electronic Safety-related Systems - Part 6:
Guidelines on the Application of GB/T 20438.2 and GB/T 20438.3. In comparison with
GB/T 20438.6-2006, the main technical changes are as follows:
---Methods of evaluating the probability of hardware failure, such as: fault tree,
Markov model and Petri net model are added (see Annex B);
---The method of the common cause failure factors of different structures is added
(see Annex D.7).
This Part uses the translation method in the equivalent adoption of IEC 61508-6:2010
Functional Safety of Electrical / Electronic / Programmable Electronic Safety-related
Systems - Part 6: Guidelines on the Application of IEC 61508-2 and IEC 61508-3.
This Part makes the following editorial modification:
---In order to be consistent with the current standard series, the title of the standard
is modified into: Functional Safety of Electrical / Electronic / Programmable
Electronic Safety-related Systems - Part 6: Guidelines on the Application of
GB/T 20438.2 and GB/T 20438.3.
This Part was proposed by China Machinery Industry Federation.
Functional Safety of Electrical / Electronic /
Programmable Electronic Safety-related Systems -
Part 6: Guidelines on the Application of GB/T 20438.2
and GB/T 20438.3
1 Scope
1.1 This part of GB/T 20438 contains information and guidelines on GB/T 20438.2 and
GB/T 20438.3.
---Annex A gives a brief overview of the requirements of GB/T 20438.2 and GB/T
20438.3 and sets out the functional steps in their application.
---Annex B gives an example technique for calculating the probabilities of
hardware failure and should be read in conjunction with 7.4.3 and Annex C of
GB/T 20438.2-2017 and Annex D.
---Annex C gives a worked example of calculating diagnostic coverage and should
be read in conjunction with Annex C of GB/T 20438.2-2017.
---Annex D gives a methodology for quantifying the effect of hardware-related
common cause failures on the probability of failure.
---Annex E gives worked examples of the application of the software safety
integrity tables specified in Annex A of GB/T 20438.3-2017 for safety integrity
levels 2 and 3.
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.