AS/NZS 62061:2019
Safety of machinery - Functional safety of safety-related electrical, electronic and programmable electronic control systems (IEC 62061:2005 CSV (ED 1.2) MOD)
Objective of this Standard is to specify requirements and make recommendations for the design, integration and validation of safety-related electrical, electronic and programmable electronic control systems (SRECS) for machines. This Standard is applicable to control systems used, either singly or in combination, to carry out safety-related control functions on machines that are not portable by hand while working, including a group of machines working together in a coordinated manner.
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AS/NZS 62061:2019 Functional safety of safety-related electrical, electronic and programmable electronic control systems (IEC 62061:2005+AMD1:2012+AMD2:2015 CSV (ED.1.2)/COR1:2015 MOD)
CONTENTS
FOREWORD
INTRODUCTION
1 Scope
2 Normative references
3 Terms, definitions and abbreviations
3.1 Alphabetical list of definitions
3.2 Terms and definitions
3.3 Abbreviations
4 Management of functional safety
4.1 Objective
4.2 Requirements
5 Requirements for the specification of Safety-Related Control Functions (SRCFs)
5.1 Objective
5.2 Specification of requirements for SRCFs
6 Design and integration of the safety-related electrical control system (SRECS)
6.1 Objective
6.2 General requirements
6.3 Requirements for behaviour (of the SRECS) on detection of a fault in the SRECS
6.4 Requirements for systematic safety integrity of the SRECS
6.5 Selection of safety-related electrical control system
6.6 Safety-related electrical control system (SRECS) design and development
6.7 Realisation of subsystems
6.8 Realisation of diagnostic functions
6.9 Hardware implementation of the SRECS
6.10 Software safety requirements specification
6.11 Software design and development
6.12 Safety-related electrical control system integration and testing
6.13 SRECS installation
7 Information for use of the SRECS
7.1 Objective
7.2 Documentation for installation, use and maintenance
8 Validation of the safety-related electrical control system
8.1 Objective
8.2 General requirements
8.3 Validation of SRECS systematic safety integrity
9 Modification
9.1 Objective
9.2 Modification procedure
9.3 Configuration management procedures
10 Documentation
Annex A (informative) SIL assignment
Annex B (informative) Example of safety-related electrical control system (SRECS) design using concepts and requirements of Clauses 5 and 6
Annex C (informative) Guide to embedded software design and development
Annex F (informative) Methodology for the estimation of susceptibility to common cause failures (CCF)
Figures
Figure 1 – Relationship of IEC 62061 to other relevant standards
Figure 2 – Workflow of the SRECS design and development process
Figure 3 – Allocation of safety requirements of the function blocks to subsystems (see 6.6.2.1.1)
Figure 4 – Workflow for subsystem design and development (see box 6B of Figure 2)
Figure 5 – Decomposition of a function block into redundant function block elements and their associated subsystem elements
Figure 6 – Subsystem A logical representation
Figure 7 – Subsystem B logical representation
Figure 8 – Subsystem C logical representation
Figure 9 – Subsystem D logical representation
Figure A.1 – Workflow of SIL assignment process
Figure A.2 – Parameters used in risk estimation
Figure A.3 – Example proforma for SIL assignment process
Figure B.1 – Terminology used in functional decomposition
Figure B.2 – Example machine
Figure B.3 – Specification of requirements for an SRCF
Figure B.4 – Decomposition to a structure of function blocks
Figure B.5 – Initial concept of an architecture for a SRECS
Figure B.6 – SRECS architecture with diagnostic functions embedded within each subsystem (SS1 to SS4)
Figure B.7 – SRECS architecture with diagnostic functions embedded within subsystem SS3
Figure B.8 – Estimation of PFHD for a SRECS
Tables
Table 2 – Overview and objectives of IEC 62061
Table 3 – Safety integrity levels: target failure values for SRCFs
Table 4 – Characteristics of subsystems 1 and 2 used in this example (see Note above)
Table 5 – Architectural constraints on subsystems: maximum SIL that can be claimed for a SRCF using this subsystem
Table 8 – Information and documentation of a SRECS
Table A.1 – Severity (Se) classification
Table A.2– Frequency and duration of exposure (Fr) classification
Table A.3– Probability (Pr) classification
Table A.4– Probability of avoiding or limiting harm (Av) classification
Table A.5– Parameters used to determine class of probability of harm (Cl)
Table A.6 – SIL assignment matrix
Table F.1 – Criteria for estimation of CCF
Table F.2 – Estimation of CCF factor (β)
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AS/NZS 62061:2019 Functional safety of safety-related electrical, electronic and programmable electronic control systems (IEC 62061:2005+AMD1:2012+AMD2:2015 CSV (ED.1.2)/COR1:2015 MOD)
CONTENTS
FOREWORD
INTRODUCTION
1 Scope
2 Normative references
3 Terms, definitions and abbreviations
3.1 Alphabetical list of definitions
3.2 Terms and definitions
3.3 Abbreviations
4 Management of functional safety
4.1 Objective
4.2 Requirements
5 Requirements for the specification of Safety-Related Control Functions (SRCFs)
5.1 Objective
5.2 Specification of requirements for SRCFs
6 Design and integration of the safety-related electrical control system (SRECS)
6.1 Objective
6.2 General requirements
6.3 Requirements for behaviour (of the SRECS) on detection of a fault in the SRECS
6.4 Requirements for systematic safety integrity of the SRECS
6.5 Selection of safety-related electrical control system
6.6 Safety-related electrical control system (SRECS) design and development
6.7 Realisation of subsystems
6.8 Realisation of diagnostic functions
6.9 Hardware implementation of the SRECS
6.10 Software safety requirements specification
6.11 Software design and development
6.12 Safety-related electrical control system integration and testing
6.13 SRECS installation
7 Information for use of the SRECS
7.1 Objective
7.2 Documentation for installation, use and maintenance
8 Validation of the safety-related electrical control system
8.1 Objective
8.2 General requirements
8.3 Validation of SRECS systematic safety integrity
9 Modification
9.1 Objective
9.2 Modification procedure
9.3 Configuration management procedures
10 Documentation
Annex A (informative) SIL assignment
Annex B (informative) Example of safety-related electrical control system (SRECS) design using concepts and requirements of Clauses 5 and 6
Annex C (informative) Guide to embedded software design and development
Annex F (informative) Methodology for the estimation of susceptibility to common cause failures (CCF)
Figures
Figure 1 – Relationship of IEC 62061 to other relevant standards
Figure 2 – Workflow of the SRECS design and development process
Figure 3 – Allocation of safety requirements of the function blocks to subsystems (see 6.6.2.1.1)
Figure 4 – Workflow for subsystem design and development (see box 6B of Figure 2)
Figure 5 – Decomposition of a function block into redundant function block elements and their associated subsystem elements
Figure 6 – Subsystem A logical representation
Figure 7 – Subsystem B logical representation
Figure 8 – Subsystem C logical representation
Figure 9 – Subsystem D logical representation
Figure A.1 – Workflow of SIL assignment process
Figure A.2 – Parameters used in risk estimation
Figure A.3 – Example proforma for SIL assignment process
Figure B.1 – Terminology used in functional decomposition
Figure B.2 – Example machine
Figure B.3 – Specification of requirements for an SRCF
Figure B.4 – Decomposition to a structure of function blocks
Figure B.5 – Initial concept of an architecture for a SRECS
Figure B.6 – SRECS architecture with diagnostic functions embedded within each subsystem (SS1 to SS4)
Figure B.7 – SRECS architecture with diagnostic functions embedded within subsystem SS3
Figure B.8 – Estimation of PFHD for a SRECS
Tables
Table 2 – Overview and objectives of IEC 62061
Table 3 – Safety integrity levels: target failure values for SRCFs
Table 4 – Characteristics of subsystems 1 and 2 used in this example (see Note above)
Table 5 – Architectural constraints on subsystems: maximum SIL that can be claimed for a SRCF using this subsystem
Table 8 – Information and documentation of a SRECS
Table A.1 – Severity (Se) classification
Table A.2– Frequency and duration of exposure (Fr) classification
Table A.3– Probability (Pr) classification
Table A.4– Probability of avoiding or limiting harm (Av) classification
Table A.5– Parameters used to determine class of probability of harm (Cl)
Table A.6 – SIL assignment matrix
Table F.1 – Criteria for estimation of CCF
Table F.2 – Estimation of CCF factor (β)
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AS/NZS 62061:2019
Online Library subscription information
Online library subscriptions provide a cost-effective solution for organisations of any size to access the latest standards, offering 24/7 access to a personalised catalogue. The service ensures subscribers have have the most up-to-date version of selected standards, incluing automatic updates for any amendments or versions. Pricing is dependent on the chosen standards and the number of concurrent users, with discounts applied from the standards PDF price. For customised subscriptions or further inquiries, contact the Online Library team.