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Functional safety Safety instrumented systems for the process industry sector Framework, definitions, system, hardware and software requirements
61511-1, Ed. 1: Functional safety - Safety instrumented systems for the
process industry sector - Part 1: Framework, definitions, system, hardware
and software requirements
Titre
FORM FDIS (IEC)/FORMULAIRE FDIS (CEI)
2002-05-14
Copyright © 2002 International Electrotechnical Commission, IEC. All rights reserved. It is
permitted to download this electronic file, to make a copy and to print out the content for the sole
purpose of preparing National Committee positions. You may not copy or "mirror" the file or
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writing from IEC.
. 2 . 61511-1/FDIS IEC(E)
CONTENTS
FOREWORD .......................................................................................................................... 5
INTRODUCTION .................................................................................................................... 7
1 Scope .............................................................................................................................. 9
2 Normative references......................................................................................................14
3 Abbreviations and definitions ..........................................................................................15
3.1 Abbreviations.........................................................................................................15
3.2 Definitions .............................................................................................................16
4 Conformance to this International Standard ....................................................................30
5 Management of functional safety.....................................................................................30
5.1 Objective ...............................................................................................................30
5.2 Requirements ........................................................................................................30
6 Safety life-cycle requirements .........................................................................................35
6.1 Objective ...............................................................................................................35
6.2 Requirements ........................................................................................................35
7 Verification .....................................................................................................................37
7.1 Objective ...............................................................................................................37
8 Process hazard and risk analysis ....................................................................................38
8.1 Objectives .............................................................................................................38
8.2 Requirements ........................................................................................................38
9 Allocation of safety functions to protection layers............................................................39
9.1 Objective ...............................................................................................................39
9.2 Requirements of the allocation process .................................................................39
9.3 Additional requirements for safety integrity level 4 .................................................40
9.4 Requirements on the basic process control system as a protection layer ...............41
9.5 Requirements for preventing common cause, common mode and dependent
failures ..................................................................................................................42
10 SIS safety requirements specification .............................................................................43
10.1 Objective ...............................................................................................................43
10.2 General requirements ............................................................................................43
10.3 SIS safety requirements.........................................................................................43
11 SIS design and engineering ............................................................................................44
11.1 Objective ...............................................................................................................44
11.2 General requirements ............................................................................................44
11.3 Requirements for system behaviour on detection of a fault ....................................46
11.4 Requirements for hardware fault tolerance.............................................................47
11.5 Requirements for selection of components and subsystems ..................................48
11.6 Field devices .........................................................................................................51
11.7 Interfaces ..............................................................................................................52
11.8 Maintenance or testing design requirements ..........................................................54
11.9 SIF probability of failure.........................................................................................54
61511-1/FDIS IEC(E) . 3 .
12 Requirements for application software, including selection criteria for utility software .....55
12.1 Application software safety life-cycle requirements ................................................56
12.2 Application software safety requirements specification...........................................62
12.3 Application software safety validation planning ......................................................64
12.4 Application software design and development........................................................64
12.5 Integration of the application software with the SIS subsystem ..............................69
12.6 FPL and LVL software modification procedures .....................................................70
12.7 Application software verification.............................................................................70
13 Factory acceptance testing (FAT) ...................................................................................71
13.1 Objectives .............................................................................................................71
13.2 Recommendations .................................................................................................71
14 SIS installation and commissioning .................................................................................73
14.1 Objectives .............................................................................................................73
14.2 Requirements ........................................................................................................73
15 SIS safety validation .......................................................................................................74
15.1 Objective ...............................................................................................................74
15.2 Requirements ........................................................................................................74
16 SIS operation and maintenance ......................................................................................76
16.1 Objectives .............................................................................................................76
16.2 Requirements ........................................................................................................76
16.3 Proof testing and inspection...................................................................................78
17 SIS modification..............................................................................................................79
17.1 Objective ...............................................................................................................79
17.2 Requirements ........................................................................................................79
18 SIS decommissioning......................................................................................................80
18.1 Objectives .............................................................................................................80
18.2 Requirements ........................................................................................................80
19 Information and documentation requirements..................................................................80
19.1 Objectives .............................................................................................................80
19.2 Requirements ........................................................................................................81
Annex A (informative) Differences ........................................................................................82
Figure 1 . Overall framework of this standard ........................................................................ 8
Figure 2 . Relationship between IEC 61511 and IEC 61508..................................................11
Figure 3 . Relationship between IEC 61511 and IEC 61508 (see 1.2) ...................................12
Figure 4 . Relationship between safety instrumented functions and other functions ..............13
Figure 5 . Relationship between system, hardware, and software of IEC 61511-1.................14
Figure 6 . Programmable electronic system (PES): structure and terminology ......................23
Figure 7 . Example SIS architecture .....................................................................................26
Figure 8 . SIS safety life-cycle phases and functional safety assessment stages ..................33
Figure 9 . Typical risk reduction methods found in process plants ........................................42
Figure 10 . Application software safety life cycle and its relationship
to the SIS safety life cycle...................................................................................56
. 4 . 61511-1/FDIS IEC(E)
Figure 11 . Application software safety life cycle (in realization phase).................................58
Figure 12 − Software development life cycle (the V-model) ...................................................59
Figure 13 . Relationship between the hardware and software architectures of SIS................62
Table 1 . Abbreviations used in IEC 61511 ...........................................................................15
Table 2 . SIS safety life-cycle overview ................................................................................36
Table 3 . Safety integrity levels: probability of failure on demand .........................................40
Table 4 . Safety integrity levels: frequency of dangerous failures of the SIF .........................40
Table 5 . Minimum hardware fault tolerance of PE logic solvers ...........................................47
Table 6 . Minimum hardware fault tolerance of sensors and final elements and non-PE
logic solvers ..........................................................................................................48
Table 7 . Application software safety life cycle: overview......................................................60
61511-1/FDIS IEC(E) . 5 .
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
FUNCTIONAL SAFETY –
SAFETY INSTRUMENTED SYSTEMS
FOR THE PROCESS INDUSTRY SECTOR –
Part 1: Framework, definitions, system,
hardware and software requirements
FOREWORD
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all national electrotechnical committees (IEC National Committees). The object of the IEC is to promote
international co-operation on all questions concerning standardization in the electrical and electronic fields. To
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Organization for Standardization (ISO) in accordance with conditions determined by agreement between the
two organizations.