1.1 This part of GB/T 20438 includes the terms and explanations used in Parts 1 to 7 of GB/T 20438. 1.2 These definitions are grouped by headings in order to understand these related terms from their context, but such grouping does not mean adding meaning to the definitions, so the headings of these groups can be ignored. 1.3 GB/T20438.1, GB/T20438.2, GB/T20438.3 and GB/T20438.4 are basic safety standards, although they are not applicable to simple E/E/PE safety-related systems (see 3.4.4) , as the basis for safety standards, in accordance with the principles contained in IEC Guide 104 and ISO/IEC Guide 51, each technical committee should consider using these standards when drafting standards, because one of the responsibilities of technical committees is to apply when drafting their own standards. Basic safety standards should be implemented everywhere. GB/T20438 can also be used as an independent standard. 1.4 Figure 1 shows the overall framework of GB/T20438, and at the same time clarifies the role of this part in the process of achieving the functional safety of E/E/PE safety-related systems.
GB/T 20438.4-2006 Referenced Document
GB/T 20438.1-2006 Functional safety of electrical/ electronic/ programmable electronic safetyrelated systems. Part 1: General requirements
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
GB/T 20438.3-2006 Functional safety of electrical/ electronic/ programmable electronic safety-related systems. Part 3: Software requirements
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
GB/T 20438.6-2006 Functional safety of electrical/ electronic/ programmable electronic safetyrelated systems. Part 6: Guidelines on the application of GB/T 20438.2 and GB/T 20438.3
GB/T 20438.4-2006 history
2017GB/T 20438.4-2017 Functional safety of electrical/electronic/programmable electronic safety-related systems—Part 4: Definitions and abbreviations
2006GB/T 20438.4-2006 Functional safety of electrical/ electronic/ programmable electronic safety-related systems. Part 4: Definitions and abbreviations