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BS EN ISO 13849-1:2023

BS EN ISO 13849-1:2023

$215.11

Safety of machinery. Safety-related parts of control systems – General principles for design

Published By Publication Date Number of Pages
BSI 2023 170
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PDF Pages PDF Title
2 undefined
7 Annex ZA(informative)Relationship between this European Standard and the essential requirements of EU Directive 2006/42/EC aimed to be covered
12 Foreword
14 Introduction
17 1 Scope
2 Normative references
18 3 Terms, definitions, symbols and abbreviated terms
3.1 Terms and definitions
26 3.2 Symbols and abbreviated terms
28 4 Overview
4.1 Risk assessment and risk reduction process at the machine
30 4.2 Contribution to the risk reduction
4.3 Design process of an SRP/CS
31 4.4 Methodology
32 4.5 Required information
33 4.6 Safety function realization by using subsystems
5 Specification of safety functions
5.1 Identification and general description of the safety function
34 5.2 Safety requirements specification
5.2.1 General requirements
37 5.2.2 Requirements for specific safety functions
40 5.2.3 Minimizing motivation to defeat safety functions
41 5.2.4 Remote access
5.3 Determination of required performance level (PLr) for each safety function
42 5.4 Review of the safety requirements specification (SRS)
5.5 Decomposition of SRP/CS into subsystems
43 6 Design considerations
6.1 Evaluation of the achieved performance level
6.1.1 General overview of performance level
45 6.1.2 Correlation between performance level (PL) and safety integrity level (SIL)
6.1.3 Architecture — Categories and their relation to MTTFD of each channel, average diagnostic coverage and common cause failure (CCF)
52 6.1.4 Mean time to dangerous failure (MTTFD)
53 6.1.5 Diagnostic coverage (DC)
54 6.1.6 Common cause failures (CCFs)
6.1.7 Systematic failures
55 6.1.8 Simplified procedure for estimating the performance level for subsystems
56 6.1.9 Alternative procedure to determine the performance level and PFH without MTTFD
58 6.1.10 Fault consideration and fault exclusion
59 6.1.11 Well-tried component
6.2 Combination of subsystems to achieve an overall performance level of the safety function
6.2.1 General
6.2.2 Known PFH values
60 6.2.3 Unknown PFH values
6.3 Software based manual parameterization
6.3.1 General
61 6.3.2 Influences on safety-related parameters
62 6.3.3 Requirements for software based manual parameterization
63 6.3.4 Verification of the parameterization tool
6.3.5 Documentation of software based manual parameterization
7 Software safety requirements
7.1 General
65 7.2 Limited variability language (LVL) and full variability language (FVL)
7.2.1 Limited variability language (LVL)
7.2.2 Full variability language (FVL)
7.2.3 Decision for limited variability language (LVL) or full variability language (FVL)
67 7.3 Safety-related embedded software (SRESW)
7.3.1 Design of safety-related embedded software (SRESW)
68 7.3.2 Alternative procedures for non-accessible embedded software
7.4 Safety-related application software (SRASW)
71 8 Verification of the achieved performance level
9 Ergonomic aspects of design
10 Validation
10.1 Validation principles
10.1.1 General
73 10.1.2 Validation plan
74 10.1.3 Generic fault lists
10.1.4 Specific fault lists
10.1.5 Information for validation
75 10.2 Validation of the safety requirements specification (SRS)
76 10.3 Validation by analysis
10.3.1 General
10.3.2 Analysis techniques
10.4 Validation by testing
10.4.1 General
77 10.4.2 Measurement accuracy
78 10.4.3 Additional requirements for testing
10.4.4 Number of test samples
10.4.5 Testing methods
79 10.5 Validation of the safety functions
10.6 Validation of the safety integrity of the SRP/CS
10.6.1 Validation of subsystem(s)
80 10.6.2 Validation of measures against systematic failures
81 10.6.3 Validation of safety-related software
82 10.6.4 Validation of combination of subsystems
10.6.5 Overall validation of safety integrity
10.7 Validation of environmental requirements
83 10.8 Validation record
10.9 Validation maintenance requirements
11 Maintainability of SRP/CS
84 12 Technical documentation
13 Information for use
13.1 General
13.2 Information for SRP/CS integration
85 13.3 Information for user
87 Annex A (informative) Guidance for the determination of required performance level (PLr)
92 Annex B (informative) Block method and safety-related block diagram
94 Annex C (informative) Calculating or evaluating MTTFD values for single components
102 Annex D (informative) Simplified method for estimating MTTFD for each channel
104 Annex E (informative) Estimates for diagnostic coverage (DC) for functions and subsystems
108 Annex F (informative) Method for quantification of measures against common cause failures (CCF)
112 Annex G (informative) Systematic failure
116 Annex H (informative) Example of a combination of several subsystems
119 Annex I (informative) Examples for the simplified procedure to estimate the PL of subsystems
127 Annex J (informative) Example of SRESW realisation
131 Annex K (informative) Numerical representation of Figure 12
136 Annex L (informative) Electromagnetic interference (EMI) immunity
140 Annex M (informative) Additional information for safety requirements specification (SRS)
142 Annex N (informative) Avoiding systematic failure in software design
162 Annex O (informative) Safety-related values of components or parts of control systems
165 Bibliography

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BS EN ISO 13849-1:2023
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