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
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 contains information and guidelines on GB/T 20438.2 and GB/T 20438.3.
- Appendix 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.
- Appendix B gives an example technique for calculating the probabilities of hardware failure and should be read in conjunction with 7.4.3 and Appendix C of GB/T 20438.2-2006 and Appendix D of this part.
- Appendix C gives a worked example of calculating diagnostic coverage and should be read in conjunction with Appendix C of GB/T 20438.2-2006.
- Appendix D gives a methodology for quantifying the effect of hardware-related common cause failures on the probability of failure.
- Appendix E gives worked examples of the application of the software safety integrity tables specified in Appendix A of GB/T 20438.3-2006 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 standards, although this status does not apply in the context of low complexity E/E/PE safety-related systems (see 3.4.4 of GB/T 20438.4-2006). As basic safety standards, 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 is also intended for use as a stand-alone standard.
1.3 One of the responsibilities of a technical committee is, wherever applicable, to make use of basic safety standards in the preparation of its standards. In this context, the requirements, test methods or test conditions of this basic safety standard do not apply unless specifically referred to or included in the standards prepared by those technical committees.
1.4 Figure 1 shows the overall framework of GB/T 20438 and indicates the role that this part plays in the achievement of functional safety for E/E/PE safety-related systems.
2 Normative References
The following documents contain provisions which, through reference in this text, constitute provisions of this part of GB/T 20438. For dated reference, subsequent amendments to (excluding any corrigendum), or revisions of, any of these publications do not apply. However, parties to agreements based on this part are encouraged to investigate the possibility of applying the most recent editions of the standards indicated below. For any undated references, the latest edition of the document referred to applies.
GB/T 20438 (All Parts) Functional Safety of Electrical/Electronic/Programmable Electronic Safety-related Systems (GB/T 20438-2006, IEC 61508, IDT)
IEC Guide 104:1997 The Preparation of Safety Publications and the Use of Basic Safety Publications and Group Safety Publications
IEC/ISO Guide 51:1990 Guidelines for the Inclusion of Safety Aspects in Standards
3 Definitions and Abbreviations
See GB/T 20438.4.
GB/T 20438.6-2006 The following standards are cited：
GB/T 20438.6-2006 Cited by the following standards：
