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IEC 61131-6 Edition 1.0 2012-10 INTERNATIONAL STANDARD NORME INTERNATIONALE Pro

IEC 61131-6 Edition 1.0 2012-10 INTERNATIONAL STANDARD NORME INTERNATIONALE Programmable controllers – Part 6: Functional safety Automates programmables – Partie 6: Sécurité fonctionnelle INTERNATIONAL ELECTROTECHNICAL COMMISSION COMMISSION ELECTROTECHNIQUE INTERNATIONALE XD ICS 25.040.40; 35.240.50 PRICE CODE CODE PRIX ISBN 978-2-83220-402-3 ® Registered trademark of the International Electrotechnical Commission Marque déposée de la Commission Electrotechnique Internationale ® Warning! Make sure that you obtained this publication from an authorized distributor. Attention! Veuillez vous assurer que vous avez obtenu cette publication via un distributeur agréé. This is a preview - click here to buy the full publication – 2 – 61131-6 © IEC:2012 CONTENTS FOREWORD ........................................................................................................................... 6 INTRODUCTION ..................................................................................................................... 8 1 Scope ............................................................................................................................. 10 2 Normative references ..................................................................................................... 11 3 Terms and definitions ..................................................................................................... 12 4 Conformance to this standard ......................................................................................... 25 5 FS-PLC safety lifecycle .................................................................................................. 25 5.1 General ................................................................................................................. 25 5.2 FS-PLC functional safety SIL capability requirements ............................................ 27 5.2.1 General ..................................................................................................... 27 5.2.2 Data security ............................................................................................. 28 5.3 Quality management system .................................................................................. 28 5.4 Management of FS-PLC safety lifecycle ................................................................ 29 5.4.1 Objectives ................................................................................................. 29 5.4.2 Requirements and procedures ................................................................... 29 5.4.3 Execution and monitoring .......................................................................... 33 5.4.4 Management of functional safety ............................................................... 33 6 FS-PLC design requirements specification...................................................................... 33 6.1 General ................................................................................................................. 33 6.2 Design requirements specification contents ........................................................... 34 6.3 Target failure rate .................................................................................................. 35 7 FS-PLC design, development and validation plan ........................................................... 36 7.1 General ................................................................................................................. 36 7.2 Segmenting requirements ...................................................................................... 36 8 FS-PLC architecture ....................................................................................................... 37 8.1 General ................................................................................................................. 37 8.2 Architectures and subsystems ............................................................................... 38 8.3 Data communication .............................................................................................. 38 9 HW design, development and validation planning ........................................................... 38 9.1 HW general requirements ...................................................................................... 38 9.2 HW functional safety requirements specification .................................................... 38 9.3 HW safety validation planning ............................................................................... 38 9.4 HW design and development ................................................................................. 39 9.4.1 General ..................................................................................................... 39 9.4.2 Requirements for FS-PLC behaviour on detection of a fault ....................... 39 9.4.3 HW safety integrity .................................................................................... 40 9.4.4 Random HW failures .................................................................................. 48 9.4.5 HW requirements for the avoidance of systematic failures ......................... 53 9.4.6 HW requirements for the control of systematic faults ................................. 53 9.4.7 HW classification of faults .......................................................................... 54 9.4.8 HW implementation ................................................................................... 55 9.4.9 De-rating of components............................................................................ 56 9.4.10 ASIC design and development ................................................................... 56 9.4.11 Techniques and measures to prevent the introduction of faults in ASICs ........................................................................................................ 56 This is a preview - click here to buy the full publication 61131-6 © IEC:2012 – 3 – 9.5 HW and embedded SW and FS-PLC integration .................................................... 56 9.6 HW operation and maintenance procedures .......................................................... 57 9.6.1 Objective ................................................................................................... 57 9.6.2 Requirements ............................................................................................ 57 9.7 HW safety validation .............................................................................................. 58 9.7.1 General ..................................................................................................... 58 9.7.2 Requirements ............................................................................................ 58 9.8 HW verification ...................................................................................................... 59 9.8.1 Objective ................................................................................................... 59 9.8.2 Requirements ............................................................................................ 59 10 FS-PLC SW design and development ............................................................................. 60 10.1 General ................................................................................................................. 60 10.2 Requirements ........................................................................................................ 61 10.3 Classification of engineering tools ......................................................................... 61 10.4 SW safety validation planning ................................................................................ 62 11 FS-PLC safety validation ................................................................................................ 62 12 FS-PLC type tests .......................................................................................................... 62 12.1 General ................................................................................................................. 62 12.2 Type test requirements .......................................................................................... 62 12.3 Climatic test requirements ..................................................................................... 65 12.4 Mechanical test requirements ................................................................................ 65 12.5 EMC test requirements .......................................................................................... 65 12.5.1 General ..................................................................................................... 65 12.5.2 General EMC environment ......................................................................... 65 12.5.3 Specified EMC environment ....................................................................... 67 13 FS-PLC verification ........................................................................................................ 69 13.1 Verification plan .................................................................................................... 69 13.2 Fault insertion test requirements ........................................................................... 70 13.3 As qualified versus as shipped .............................................................................. 71 14 Functional safety assessment ......................................................................................... 71 14.1 Objective ............................................................................................................... 71 14.2 Assessment requirements ..................................................................................... 72 14.2.1 Assessment evidence and documentation ................................................. 72 14.2.2 Assessment method .................................................................................. 72 14.3 FS-PLC assessment information............................................................................ 74 14.4 Independence........................................................................................................ 74 15 FS-PLC operation, maintenance and modification procedures ........................................ 75 15.1 Objective ............................................................................................................... 75 15.2 FS-PLC modification.............................................................................................. 75 16 Information to be provided by the FS-PLC manufacturer for the user .............................. 76 16.1 General ................................................................................................................. 76 16.2 Information on conformance to this standard ......................................................... 76 16.3 Information on type and content of documentation ................................................. 76 16.4 Information on catalogues and/or datasheets ........................................................ 76 16.5 Safety manual ....................................................................................................... 76 16.5.1 General ..................................................................................................... 76 16.5.2 Safety manual contents ............................................................................. 76 Annex A (informative) Reliability calculations ....................................................................... 79 This is a preview - click here to buy the full publication – 4 – 61131-6 © IEC:2012 Annex B (informative) Typical FS-PLC Architectures ............................................................ 80 Annex C (informative) Energise to trip applications of FS-PLC ............................................. 86 Annex D (informative) Available failure rate databases ........................................................ 88 Annex E (informative) Methodology for the estimation of common cause failure rates in a multiple channel FS-PLC ................................................................................................ 90 Bibliography .......................................................................................................................... 92 Figure 1 – FS-PLC in the overall E/E/PE safety-related system safety lifecycle phases ........... 9 Figure 2 – Failure model ....................................................................................................... 16 Figure 3 – FS-PLC safety lifecycle (in realization phase) ...................................................... 26 Figure 4 – Relevant parts of a safety function ....................................................................... 35 Figure 5 – FS-PLC to engineering tools relationship ............................................................. 37 Figure 6 – HW subsystem decomposition .............................................................................. 43 Figure 7 – Example: determination of the maximum SIL for specified architecture ................ 45 Figure 8 – Example of limitation on hardware safety integrity for a multiple-channel safety function ...................................................................................................................... 47 Figure 9 – Fault classification and FS-PLC behaviour ........................................................... 54 Figure 10 – ASIC development lifecycle (V-Model) ................................................................ 56 Figure 11 – Model of FS-PLC and engineering tools layers ................................................... 60 Figure B.1 – Single FS-PLC with single I/O and external watchdog (1oo1D) ......................... 81 Figure B.2 – Dual PE with single I/O and external watchdogs (1oo1D) .................................. 81 Figure B.3 – Dual PE with dual I/O, no inter-processor communication, and 1oo2 shutdown logic ...................................................................................................................... 82 Figure B.4 – Dual PE with dual I/O, inter-processor communication, and 1oo2D shutdown logic ...................................................................................................................... 83 Figure B.5 – Dual PE with dual I/O, no inter-processor communication, external watchdogs, and 2oo2 shutdown logic .................................................................................... 83 Figure B.6 – Dual PE with dual I/O, inter-processor communication, external watchdogs, and 2oo2D shutdown logic ................................................................................. 84 Figure B.7 – Triple PE with triple I/O, inter-processor communication, and 2oo3D shutdown logic ...................................................................................................................... 85 Table 1 – Safety integrity levels for low demand mode of operation ...................................... 35 Table 2 – Safety integrity levels for high demand or continuous mode of operation ............... 36 Table 3 – Faults to be detected and notified (alarmed) to the application program ................ 40 Table 4 – Hardware safety integrity – low complexity (type A) subsystem ............................. 41 Table 5 – Hardware safety integrity – high complexity (type B) subsystem ............................ 41 Table 6 – Faults or failures to be assumed when quantifying the effect of random hardware failures or to be taken into account in the derivation of safe failure fraction ........... 50 Table 7 – Examples of tool classification ............................................................................... 61 Table 8 – Performance criteria .............................................................................................. 64 Table 9 – Immunity test levels for enclosure port tests in general EMC environment ............. 66 Table 10 – Immunity test levels in general EMC environment ................................................ 67 Table 11 – Immunity test levels for enclosure port tests in specified EMC environment ......... 68 Table 12 – Immunity test levels in specified EMC environment ............................................. 69 Table 13 – Fault tolerance test, required effectiveness ......................................................... 71 This is a preview - click here to buy the full publication 61131-6 © IEC:2012 – 5 – Table 14 – Functional safety assessment Information ........................................................... 74 Table 15 – Minimum levels of independence of those carrying out functional safety assessment .......................................................................................................................... 75 Table E.1 – Criteria for estimation of common cause failure .................................................. 90 Table E.2 – Estimation of common cause failure factor ......................................................... 91 This is a preview - click here to buy the full publication – 6 – 61131-6 © IEC:2012 INTERNATIONAL ELECTROTECHNICAL COMMISSION ____________ PROGRAMMABLE CONTROLLERS – Part 6: Functional safety FOREWORD 1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising all national electrotechnical committees (IEC National Committees). The object of IEC is to promote international co-operation on all questions concerning standardization in the electrical and electronic fields. To this end and in addition to other activities, IEC publishes International Standards, Technical Specifications, Technical Reports, Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC Publication(s)”). Their preparation is entrusted to technical committees; any IEC National Committee interested in the subject dealt with may participate in this preparatory work. International, governmental and non- governmental organizations liaising with the IEC also participate in this preparation. IEC collaborates closely with the International Organization for Standardization (ISO) in accordance with conditions determined by agreement between the two organizations. 2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international consensus of opinion on the relevant subjects since each technical committee has representation from all interested IEC National Committees. 3) IEC Publications have the form of recommendations for international use and are accepted by IEC National Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any misinterpretation by any end user. 4) In order to promote international uploads/Management/international-standard-norme-internationale 1 .pdf