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BSI PD IEC TR 61511-4:2020

BSI PD IEC TR 61511-4:2020

$167.15

Functional safety. Safety instrumented systems for the process industry sector – Explanation and rationale for changes in IEC 61511-1 from Edition 1 to Edition 2

Published By Publication Date Number of Pages
BSI 2020 42
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IEC TR 61511-4:2020(E), Functional safety – safety instrumented systems for the process industry sector, which is a Technical Report: • specifies the rationale behind all clauses and the relationship between them, • raises awareness for the most common misconceptions and misinterpretations of the clauses and the changes related to them, • explains the differences between Ed. 1 and Ed. 2 of IEC 61511-1 and the reasons behind the changes, • presents high level summaries of how to fulfil the requirements of the clauses, and • explains differences in terminology between IEC 61508-4:2010 and IEC 61511-1 Ed. 2.

PDF Catalog

PDF Pages PDF Title
2 undefined
4 CONTENTS
7 FOREWORD
9 INTRODUCTION
10 1 Scope
2 Normative references
3 Terms, definitions and abbreviated terms
3.1 Terms and definitions
11 3.2 Abbreviated terms
Table 1 – Abbreviated terms used in IEC TR 61511-4
12 4 Background
5 Management of functional safety (IEC 61511-1 Ed. 2 Clause 5)
5.1 Why is this clause important?
5.2 Common misconceptions
13 5.3 What was changed from Ed. 1 to Ed. 2 and why?
5.3.1 Existing systems
5.3.2 Change management
5.3.3 Performance metrics and quality assurance
14 5.3.4 Competency
5.3.5 More requirements for functional safety product and service providers
5.4 Summary on how
6 Safety life cycle (IEC 61511-1 Ed. 2 Clause 6)
6.1 Why is this clause important?
6.2 Common misconceptions
15 6.3 What was changed from Ed. 1 to Ed. 2 and why?
6.4 Summary on how
7 Verification (IEC 61511-1 Ed. 2 Clause 7)
7.1 Why is this clause important?
7.2 Common misconceptions
7.3 What was changed from Ed. 1 to Ed. 2 and why?
7.4 Summary on how
8 Hazard and risk analysis (IEC 61511-1 Ed. 2 Clause 8)
8.1 Why is this clause important?
16 8.2 Common misconceptions
8.3 What was changed from Ed. 1 to Ed. 2 and why?
17 8.4 Summary on how
9 Allocation of safety functions to protection layers (IEC 61511-1 Ed. 2 Clause 9)
9.1 Why is this clause important?
9.2 Common misconceptions
18 9.3 What was changed from Ed. 1 to Ed. 2 and why?
9.3.1 Limits on BPCS protection layers
9.3.2 Requirements for claiming RRF > 10 000 in total for instrumented safeguards
9.4 Summary on how
19 10 SIS safety requirements specification (IEC 61511-1 Ed. 2 Clause 10)
10.1 Why is this clause important?
10.2 Common misconceptions
20 10.3 What was changed from Ed. 1 to Ed. 2 and why?
10.4 Summary on how
11 Design and engineering (IEC 61511-1 Ed. 2 Clause 11)
11.1 Why is this clause important?
11.2 Common misconceptions
21 11.3 What was changed from Ed. 1 to Ed. 2 and why?
11.3.1 Hardware fault tolerance
22 11.3.2 Security risk requirements
11.3.3 Safety manual
11.3.4 Requirements for system behaviour on detection of a fault
23 11.3.5 Limitations on field device communication design
11.4 Summary on how
12 Application program development (IEC 61511-1 Ed. 2 Clause 12)
12.1 Why is this clause important?
24 12.2 Common misconceptions
12.3 What was changed from Ed. 1 to Ed. 2 and why?
12.4 Summary on how
13 Factory acceptance test (IEC 61511-1 Ed. 2 Clause 13)
13.1 Why is this clause important?
25 13.2 Common misconceptions
13.3 What was changed from Ed. 1 to Ed. 2 and why?
13.4 Summary on how
14 Installation (IEC 61511-1 Ed. 2 Clause 14)
14.1 Why is this clause important?
26 14.2 Common misconceptions
14.3 What was changed from Ed. 1 to Ed. 2 and why?
14.4 Summary on how
15 Validation (IEC 61511-1 Ed. 2 Clause 15)
15.1 Why is this clause important?
15.2 Common misconceptions
15.3 What was changed from Ed. 1 to Ed. 2 and why?
15.4 Summary on how
27 16 Operation and maintenance (IEC 61511-1 Ed. 2 Clause 16)
16.1 Why is this clause important?
16.2 Common misconceptions
28 16.3 What was changed from Ed. 1 to Ed. 2 and why?
16.3.1 Fault detection, bypassing, and compensating measures
16.3.2 Proof testing after repair and change
16.4 Summary on how
17 Modification (IEC 61511-1 Ed. 2 Clause 17)
17.1 Why is this clause important?
17.2 Common misconceptions
29 17.3 What was changed from Ed. 1 to Ed. 2 and why?
17.3.1 Planning for and completing change
17.4 Summary on how
18 Decommissioning (IEC 61511-1 Ed. 2 Clause 18)
18.1 Why is this clause important?
18.2 Common misconceptions
30 18.3 What was changed from Ed. 1 to Ed. 2 and why?
18.3.1 Planning for and completing change
18.4 Summary on how
19 Documentation (IEC 61511-1 Ed. 2 Clause 19)
19.1 Why is this clause important?
19.2 Common misconceptions
19.3 What was changed from Ed. 1 to Ed. 2 and why?
19.4 Summary on how
31 20 Definitions (IEC 61511-1 Ed. 2 Clause 3)
20.1 Why is this clause important?
20.2 Common misconceptions
20.3 What was changed from Ed. 1 to Ed. 2 and why?
Table 2 – Rationale for IEC 61511-1 Ed. 2 terms and definitions
39 20.4 Summary on how
40 Bibliography

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