• AS 61508.2-2001

    Superseded A superseded Standard is one, which is fully replaced by another Standard, which is a new edition of the same Standard.

    Functional safety of electrical/electronic/programmable electronic safety-related systems - Requirements for electrical/electronic/programmable electronic safety-related systems

    Available format(s):  Hardcopy, PDF 1 User, PDF 3 Users, PDF 5 Users, PDF 9 Users

    Superseded date:  25-06-2021

    Language(s):  English

    Published date:  01-01-2001

    Publisher:  Standards Australia

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    Table of Contents - (Show below) - (Hide below)

    4 - PREFACE
    5 - CONTENTS
    7 - 1 Scope
    10 - 2 Normative references
    11 - 3 Definitions and abbreviations
    11 - 4 Conformance to this standard
    11 - 5 Documentation
    11 - 6 Management of functional safety
    11 - 7 E/E/PES safety lifecycle requirements
    11 - 7.1 General
    11 - 7.1.1 Objectives and requirements: General
    12 - 7.1.2 Objectives
    12 - 7.1.3 Requirements
    15 - 7.2 E/E/PES safety requirements specification
    15 - 7.2.1 Objective
    15 - 7.2.2 General requirements
    15 - 7.2.3 E/E/PES safety requirements
    17 - 7.3 E/E/PES safety validation planning
    17 - 7.3.1 Objective
    17 - 7.3.2 Requirements
    17 - 7.4 E/E/PES design and development
    17 - 7.4.1 Objective
    17 - 7.4.2 General requirements
    20 - 7.4.3 Requirements for hardware safety integrity
    27 - 7.4.4 Requirements for the avoidance of failures
    27 - 7.4.5 Requirements for the control of systematic faults
    28 - 7.4.6 Requirements for system behaviour on detection of a fault
    29 - 7.4.7 Requirements for E/E/PES implementation
    31 - 7.4.8 Requirements for data communications
    32 - 7.5 E/ E/ PES integration
    32 - 7.5.1 Objective
    32 - 7.5.2 Requirements
    33 - 7.6 E/E/PES operation and maintenance procedures
    33 - 7.6.1 Objective
    33 - 7.6.2 Requirements
    34 - 7.7 E/E/PES safety validation
    34 - 7.7.1 Objective
    34 - 7.7.2 Requirements
    35 - 7.8 E/E/PES modification
    35 - 7.8.1 Objective
    35 - 7.8.2 Requirements
    35 - 7.9 E/E/PES verification
    35 - 7.9.1 Objective
    36 - 7.9.2 Requirements
    37 - 8 Functional safety assessment
    38 - Annex A - Techniques and measures for E/E/PE safety-related systems: control of failures during operation
    38 - A.1 General
    39 - A.2 Hardware safety integrity
    47 - A.3 Systematic safety integrity
    53 - Annex B - Techniques and measures for E/E/PE safety-related systems: avoidance of systematic failures during the different p
    62 - Annex C - Diagnostic coverage and safe failure fraction
    62 - C.1 Calculation of diagnostic coverage and safe failure fraction of a subsystem
    63 - C.2 Determination of diagnostic coverage factors
    65 - Bibliography

    Abstract - (Show below) - (Hide below)

    Specifies the safety lifecycle activities in systems comprised of electrical/electronic/programmable electronic devices with the requirements for techniques and measures that are graded against safety integrity levels, for the avoidance and control of faults and failures.

    Scope - (Show below) - (Hide below)

    1.1 This part of IEC 61508– is intended to be used only after a thorough understanding of IEC 61508-1, which provides the overall framework for the achievement of functional safety;– applies to any safety-related system, as defined by IEC 61508-1, which contains at least one electrical, electronic or programmable electronic based component;– applies to all subsystems and their components within an E/E/PE safety-related system (including sensors, actuators and the operator interface);– specifies how to refine the information developed in accordance with IEC 61508-1, concerning the overall safety requirements and their allocation to E/E/PE safety-related systems, and specifies how the overall safety requirements are refined into E/E/PES safety functions requirements and E/E/PES safety integrity requirements;– specifies requirements for activities that are to be applied during the design and manufacture of the E/E/PE safety-related systems (i.e. establishes the E/E/PES safety lifecycle model), except for software, which is dealt with by IEC 61508-3 (see figures 2 and 3)– these requirements include the application of techniques and measures, which are graded against the safety integrity level, for the avoidance of, and control of, faults and failures;– specifies the information necessary for carrying out the installation, commissioning and final safety validation of the E/E/PE safety-related systems;– does not apply to the operation and maintenance phase of the E/E/PE safety-related systems – this is dealt with in IEC 61508-1 – however, IEC 61508-2 does provide requirements for the preparation of information and procedures needed by the user for the operation and maintenance of the E/E/PE safety-related systems;– specifies requirements to be met by the organisation carrying out any modification of the E/E/PE safety-related systems.NOTE 1 This part of IEC 61508 is mainly directed at suppliers and/or in-company engineering departments, hence the inclusion of requirements for modification.NOTE 2 The relationship between IEC 61508-2 and IEC 61508-3 is illustrated in figure 3.1.2 IEC 61508-1, IEC 61508-2, IEC 61508-3 and IEC 61508-4 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 of IEC 61508-4). 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. IEC 61508 is also intended for use as a stand-alone standard.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.NOTE 1 The functional safety of an E/E/PE safety-related system can only be achieved when all related requirements are met. Therefore, it is important that all related requirements are carefully considered and adequately referenced.NOTE 2 In the USA and Canada, until the proposed sector implementation of IEC 61508 (i.e. IEC 61511) is published as an international standard in the USA and Canada, existing national process safety standards based on IEC 61508 (i.e. ANSI/ISA-S84.01) can be applied to the process sector instead of IEC 61508.1.3 Figure 1 shows the overall framework for parts 1 to 7 of IEC 61508 and indicates the role that IEC 61508-2 plays in the achievement of functional safety for E/E/PE safety-related systems. Annex A of IEC 61508-6 describes the application of IEC 61508-2 and IEC 61508-3.

    General Product Information - (Show below) - (Hide below)

    Committee IT-006
    Document Type Standard
    Publisher Standards Australia
    Status Superseded
    Superseded By
    Under Revision

    History - (Show below) - (Hide below)

    First published as AS 61508.2-2001.

    Standards Referenced By This Book - (Show below) - (Hide below)

    AS 61508.1-1999 Functional safety of electrical/electronic/programmable electronic safety-related systems - General requirements
    AS/NZS 61000.1.1:2000 Electromagnetic compatibility (EMC) General - Application and interpretation of fundamental definitions and terms (Reconfirmed 2016)
    AS 61508.3-1999 Functional safety of electrical/electronic/programmable electronic safety-related systems - Software requirements
    AS 61508.5-1999 Functional safety of electrical/electronic/programmable electronic safety-related systems - Examples of methods for the determination of safety integrity levels
    AS 61508.4-1999 Functional safety of electrical/electronic/programmable electronic safety-related systems - Definition and abbreviations
    AS/NZS 61000.2.5:1999 Electromagnetic compatibility (EMC) Environment - Classification of electromagnetic environments (Reconfirmed 2016)
    AS 1852.371-1988 International electrotechnical vocabulary - Telecontrol

    Standards Referencing This Book - (Show below) - (Hide below)

    AS 4024.1501-2006 Safety of machinery Design of safety related parts of control systems - General principles for design (Reconfirmed 2014)
    AS/NZS 4240.2:2009 Remote control systems for mining equipment Operation and maintenance for underground metalliferous mining (Reconfirmed 2021)
    AS 61508.0-2006 Functional safety of electrical/electronic/programmable electronic safety-related systems - Functional safety and AS 61508
    AS/NZS 4024.1:2006 Series Safety of machinery Safety of machinery series
    AS 3814-2005 Industrial and commercial gas-fired appliances
    AS 1210-2010 Pressure vessels (Reconfirmed 2021)
    AS 4024.1202-2006 Safety of machinery General principles - Technical principles
    AS 4722-2009 Passenger ropeways and passenger conveyors
    AS/NZS 2290.1:2005 Electrical equipment for coal mines - Introduction and maintenance - For hazardous areas
    AS/NZS 2081.1:2002 Electrical equipment for coal and shale mines - Electrical protection devices - General requirements
    AS 62061-2006 Safety of machinery - Functional safety of safety-related electrical, electronic and programmable electronic control systems
    AS 60204.11-2006 Safety of machinery - Electrical equipment of machines Requirements for HV equipment for voltages above 1000 V a.c. or 1500 V d.c and not exceeding 36 kV (IEC 60204-11, Ed. 1.0 (2000) MOD)
    AS 60204.11-2006 Safety of machinery - Electrical equipment of machines Requirements for HV equipment for voltages above 1000 V a.c. or 1500 V d.c and not exceeding 36 kV (IEC 60204-11, Ed. 1.0 (2000) MOD)
    AS 60204.1-2005 Safety of machinery - Electrical equipment of machines General requirements (IEC 60204-1, Ed. 5 (FDIS) MOD)
    AS 3533.1-2009 Amusement rides and devices Design and construction
    AS 2578-2009 Traffic signal controllers
    AS 4024.1502-2006 Safety of machinery Design of safety related parts of control systems - Validation (Reconfirmed 2014)
    AS/NZS 3788:2006 Pressure equipment - In-service inspection
    AS IEC 61131.8-2004 Programmable controllers - Guidelines for the application and implementation of programming languages
    AS/NZS 4871.6:2007 Electrical equipment for coal mines, for use underground Diesel powered machinery and ancillary equipment
    AS/NZS 1826:2008 Electrical equipment for explosive gas atmospheres - Special protection - Type of protection 's'
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