BSI PD CLC IEC/TR 63161:2024
$198.66
Assignment of safety integrity requirements. Basic rationale
| Published By | Publication Date | Number of Pages |
| BSI | 2024 | 52 |
PDF Catalog
| PDF Pages | PDF Title |
|---|---|
| 2 | undefined |
| 4 | European foreword Endorsement notice |
| 5 | Annex ZA (normative) Normative references to international publications with their corresponding European publications |
| 6 | CONTENTS |
| 8 | FOREWORD |
| 10 | INTRODUCTION |
| 11 | 1 Scope 2 Normative references 3 Terms and definitions |
| 14 | 4 Risk based quantitative approach 4.1 General 4.2 Sequence of steps in functional safety assignment |
| 16 | 4.3 Reference information 4.3.1 General Figures Figure 1 – Sequence of steps in functional safety assignment |
| 17 | 4.3.2 Accident scenario 4.3.3 Hazard zone 4.3.4 Severity of harm |
| 18 | 4.3.5 Safety control function 5 Quantified parameters of a functional safety assignment 5.1 General 5.2 Parameter types 5.2.1 General 5.2.2 Probability 5.2.3 Event rate |
| 19 | 5.3 Probability of occurrence of harm 5.4 Quantification of risk 5.5 Target failure measure |
| 20 | 5.6 Probability of occurrence of a hazardous event – Pr |
| 21 | 5.7 Exposure parameter – Fr |
| 22 | 5.8 Probability of avoiding or limiting harm – Av 5.8.1 General 5.8.2 Vulnerability (V) |
| 23 | 5.8.3 Avoidability (A) 5.9 Demand types and related event rates 5.9.1 Event classes |
| 24 | 5.9.2 Demand and demand rate 5.9.3 Initiating events and rate of initiating events IR |
| 25 | 5.9.4 Safety demands and safety demand rate DR |
| 26 | 5.9.5 Tolerable risk limit – Parameter L(S) Figure 2 – Protection layers, event rates and their relation |
| 27 | 5.10 Additional parameters |
| 28 | Table 1 – Parameters overview |
| 29 | 6 General principle of functional safety assignment 6.1 Basics 6.1.1 Applicability to complete functions 6.1.2 Risk relation 6.1.3 Logical independence of parameters 6.2 High demand or continuous mode of operation |
| 30 | 6.3 Low demand mode of operation |
| 31 | 7 Assignment of the demand mode 7.1 Demand mode – General |
| 33 | Figure 3 – Hazard rate according to the Henley / Kumamoto equation |
| 34 | 7.2 Assignment criteria 8 Relation to ISO 12100 |
| 35 | 9 Tools for functional safety assignment 9.1 General Figure 4 – Elements of risk according to ISO 12100 |
| 36 | 9.2 Selection of independent parameters 9.3 Logarithmizing parameters 9.4 Discretization of parameters |
| 37 | 9.5 Parameter scores Figure 5 – Discretization of parameters |
| 38 | 9.6 Scoring methods in strict sense |
| 39 | Annex A (informative)Examples of SIL assignment tools numerical analysis A.1 General A.2 Assignment of score values to parameter entries |
| 40 | A.3 Extraction of tolerable risk limits |
| 41 | Figure A.1 – Extraction of tolerable risk limits |
| 42 | A.4 Risk matrix of IEC 62061 Figure A.2 – Risk matrix based on IEC 62061 |
| 43 | Figure A.3 – Maximum allowable PFH as function of the score sumfor the different severity levels |
| 44 | Figure A.4 – Representation by a continuous numerical interpolation |
| 45 | A.5 Risk graph of ISO 13849 Figure A.5 – Risk graph of ISO 13849-1 |
| 46 | Table A.1 – Relation between PLs and ranges in PFH |
| 47 | A.6 Risk graphs for low demand mode of operation Figure A.6 – Interpolation per severity level |
| 48 | Figure A.7 – Risk graph for low demand mode of operation |
| 49 | Figure A.8 – Risk graph for low demand mode of operation –from Figure 7 of VDMA 4315-1 |
| 50 | Bibliography |
