GB/T 20438.1-2017 PDF English

GB/T20438.1-2017 (GBT20438.1-2017): PDF in English

GB/T 20438.1-2017 GB NATIONAL STANDARD OF THE PEOPLE’S REPUBLIC OF CHINA ICS 25.040 N 10 GB/T 20438.1-2017 / IEC 61508-1:2010 Replacing GB/T 20438.1-2006 Functional safety of electrical / electronic / programmable electronic safety-related systems - Part 1: General requirements (IEC 61508-1:2010, IDT) ISSUED ON: DECEMBER 29, 2017 IMPLEMENTED ON: JULY 01, 2018 Issued by: General Administration of Quality Supervision, Inspection and Quarantine; Standardization Administration of the People’s Republic of China. Table of Contents FOREWORD ... 4  INTRODUCTION ... 6  1 Scope ... 9  2 Normative references ... 12  3 Definitions and abbreviations ... 13  4 Conformance to GB/T 20438 ... 13  5 Documentation ... 14  5.1 Objectives ... 14  5.2 Requirements ... 14  6 Management of functional safety ... 16  6.1 Objectives ... 16  6.2 Requirements ... 16  7 Overall safety lifecycle requirements ... 21  7.1 General ... 21  7.2 Concept ... 31  7.3 Overall scope definition ... 31  7.4 Hazard and risk analysis ... 32  7.5 Overall safety requirements ... 35  7.6 Overall safety requirements allocation ... 38  7.7 Overall operation and maintenance planning ... 46  7.8 Overall safety validation planning ... 49  7.9 Overall installation and commissioning planning ... 50  7.10 E/E/PE system safety requirements specification ... 52  7.11 E/E/PE safety-related systems - realisation ... 55  7.12 Other risk reduction measures - specification and realisation ... 56  7.13 Overall installation and commissioning ... 56  7.14 Overall safety validation ... 57  7.15 Overall operation, maintenance and repair ... 58  7.16 Overall modification and retrofit ... 62  7.17 Decommissioning or disposal ... 65  7.18 Verification ... 67  8 Functional safety assessment ... 68  8.1 Objective ... 68  8.2 Requirements ... 68  Annex A (Informative) Example of a documentation structure ... 74  Bibliography ... 80  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 Part is Part 1 of GB/T 20438. This Part was drafted in accordance with the rules given in GB/T 1.1-2009. This Part replaces GB/T 20438.1-2006 "Functional safety of electrical/electronic/programmable electronic safety-related systems - Part 1: General requirements". Compared with GB/T 20438.1-2006, the major technical changes are as follows: -- Add the requirements for the competence of persons in management of functional safety (see Clause 6); -- Add the E/E/PE system safety requirements specification phase in the overall safety lifecycle (see 7.10); -- Modify the evaluation method for evaluating independence (see Clause 8). This Part uses the translation method to equivalently adopt IEC 61508-1:2010 "Functional safety of electrical/electronic/programmable electronic safety- related systems - Part 1: General requirements". This Part was proposed by China Mechinery Industry Federation. This Standard shall be under the jurisdiction of National Technical Committee 124 on Industrial Process Measurement and Control of Standardization Administration of China (SAC/TC 124). Functional safety of electrical/electronic/programmable electronic safety- related systems - Part 1: General requirements 1 Scope 1.1 GB/T 20438 covers those aspects to be considered when electrical/electronic/programmable electronic (E/E/PE) systems are used to carry out safety functions. A major objective of GB/T 20438 is to facilitate the development of product and application sector national standards by the technical committees responsible for the product or application sector. This will allow all the relevant factors, associated with the product or application, to be fully taken into account and thereby meet the specific needs of users of the product and the application sector. A second objective of GB/T 20438 is to enable the development of E/E/PE safety-related systems where product or application sector national standards do not exist. 1.2 In particular, GB/T 20438 a) applies to safety-related systems when one or more of such systems incorporates electrical/electronic/programmable electronic elements; NOTE 1: In the context of low complexity E/E/PE safety-related systems, certain requirements specified in GB/T 20438 may be unnecessary, and exemption from compliance with such requirements is possible (see 4.2, and the definition of a low complexity E/E/PE safety-related system in 3.4.3 of GB/T 20438.4-2017). NOTE 2: Although a person can form part of a safety-related system (see 3.4.1 of GB/T 20438.4-2017), human factor requirements related to the design of E/E/PE safety-related systems are not considered in detail in GB/T 20438. b) is generically-based and applicable to all E/E/PE safety-related systems irrespective of the application; c) covers the achievement of a tolerable risk through the application of E/E/PE safety-related systems, but does not cover hazards arising from the E/E/PE equipment itself (for example electric shock); d) applies to all types of E/E/PE safety-related systems, including protection systems and control systems; .......
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