1.1 This part of GB/T 20438 contains the definitions and explanation of terms that are used in parts 1 to 7 of this standard.
1.2 The definitions are grouped under general headings so that related terms can be understood within the context of each other. But it should be noted that these headings are not intended to add meaning to the definitions and in this sense the headings should be disregarded.
1.3 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 3.4.4). 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. One of the responsibilities of a technical committee is wherever applicable to make use of basic safety publications in the preparation of its own publications. GB/T 20438 is also intended for use as a stand-alone standard.
1.4 Figure 1 shows the overall framework for 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 normative documents contain provisions which through reference in this text constitute provisions of this part of GB/T 20438. For dated references subsequent amendments to 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 normative documents indicated below. For undated references the latest edition of the normative document referred to applies. Members of IEC and 180 maintain registers of currently valid International 8tandards.
GB/T 20438.1-2006 FUNCTIONAL SAFETY OF ELECTRICAL/ELECTRONIC/PROGRAMMABLE ELECTRONIC SAFETY-RELATED SYSTEMS- Part 1: General Requirements (IEC 61508-1: 1998, IDT)
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: 2000, IDT)
GB/T 20438.3-2006 FUNCTIONAL SAFETY OF ELECTRICAL/ELECTRONIC/PROGRAMMABLE ELECTRONIC SAFETY-RELATED SYSTEMS - Part 3: Software Requirements (IEC 61508-3: 1998, IDT)
GB/T 20438.5-2006 FUNCTIONAL SAFETY OF ELECTRICAL/ELECTRONIC/PROGRAMMABLE ELECTRONIC SAFETY-RELATED SYSTEMS- Part 5: Examples of Methods for the Determination of Safety Integrity Levels (IEC 61508-5:1998, IDT)
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 61508-6:2000, IDT)
GB/T 20438.7-2006 FUNCTIONAL SAFETY OF ELECTRICAL/ELECTRONIC/PROGRAMMABLE ELECTRONIC SAFETY-RELATED SYSTEMS - Part 7: Overview of Techniques and Measures (IEC 61508-7: 2000, IDT)
ISO/IEC 2382-14:1998 Data processing - Vocabulary - Part 14: Reliability, Maintainability and Availability
ISO/IEC Guide 51:1990 Safety Aspects - Guidelines for their Inclusion in Standards
ISO/8402:1994 Quality Management and Quality Assurance - Vocabulary
IEC Guide 104:1997 The Preparation of Safety Publications and the Use of Basic Safety Publications and Group Safety Publications
IEC 60050(191):1990 International Electro-technical Vocabulary (IEV) - Chapter 191: Dependability and Quality of Service
IEC 60050(351):1975 International Electro-technical Vocabulary (IEV) - Chapter 351: Automatic Control
GB/T 20438.4-2006 The following standards are cited：
