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BS EN ISO 25119-2:2023

BS EN ISO 25119-2:2023

$198.66

Tractors and machinery for agriculture and forestry. Safety-related parts of control systems – Concept phase

Published By Publication Date Number of Pages
BSI 2023 64
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This document specifies the concept phase of the development of safety-related parts of control systems (SRP/CS) on tractors used in agriculture and forestry and on self-propelled ride-on machines and mounted, semi-mounted and trailed machines used in agriculture. It can also be applied to mobile municipal equipment (such as street-sweeping machines). This document is not applicable to: — aircraft and air-cushion vehicles used in agriculture; — lawn and garden equipment. This document specifies the characteristics and categories required of SRP/CS for carrying out their safety-related functions. It does not identify performance levels for specific applications. NOTE 1 Machine specific type-C standards can specify performance levels (AgPL) for safety-related functions in machines within their scope. Otherwise, the specification of AgPL is the responsibility of the manufacturer. This document is applicable to the safety-related parts of electrical/electronic/programmable electronic systems (E/E/PES), as these relate to mechatronic systems. It covers the possible hazards caused by malfunctioning behaviour of E/E/PES safety-related systems, including interaction of these systems. It does not address hazards related to electric shock, fire, smoke, heat, radiation, toxicity, flammability, reactivity, corrosion, release of energy, and similar hazards., unless directly caused by malfunctioning behaviour of E/E/PES safety-related systems. It also covers malfunctioning behaviour of E/E/PES safety-related systems involved in protection measures, safeguards, or safety-related functions in response to non-E/E/PES hazards. Examples included within the scope of this document: — SRP/CS’s limiting current flow in electric hybrids to prevent insulation failure/shock hazards; — electromagnetic interference with the SRP/CS; — SRP/CS’s designed to prevent fire. Examples not included within the scope of this document: — insulation failure due to friction that leads to electric shock hazards; — nominal electromagnetic radiation impacting nearby machine control systems; — corrosion causing electric cables to overheat. This document is not applicable to non-E/E/PES systems (such as hydraulic, mechanic or pneumatic). NOTE 2 See also ISO 12100 for design principles related to the safety of machinery. This document is not applicable to safety-related parts of control systems manufactured before the date of its publication.

PDF Catalog

PDF Pages PDF Title
2 undefined
5 Annex ZA (informative)Relationship between this European Standard and the essential requirements of Directive 2006/42/EC aimed to be covered
13 Foreword
14 Introduction
17 1 Scope
18 2 Normative references
3 Terms and definitions
4 Abbreviated terms
19 5 Concept — UoO
5.1 Objectives
5.2 Prerequisites
5.3 Requirements
5.3.1 Basic requirements and ambient conditions
20 5.3.2 Limits of UoO and its interfaces with other UoO
5.3.3 Mapping and allocation of relevant functions to involved UoO, sources of stress
5.3.4 Additional determinations
5.4 Work products
21 6 HARA — Determination of the AgPLr
6.1 Objectives
6.2 Prerequisites
6.3 Requirements
6.3.1 Procedures for preparing a HARA
6.3.2 Tasks in the HARA
6.3.3 Participants in HARA
6.3.4 Classification of a potential harm
22 6.3.5 Classification of exposure in the situation observed
6.3.6 Classification of a possible avoidance of harm
23 6.3.7 Selecting the AgPLr
25 6.4 Work products
7 Functional safety concept
7.1 Objectives
7.2 Prerequisites
7.3 Requirements
7.3.1 Safety goals
7.3.2 Functional safety requirements
26 7.3.3 Value of MTTFD
7.3.4 Value of DC
7.3.5 Selection of categories, MTTFDC, DC and SRL
27 7.3.6 Achieving the AgPLr
28 7.3.7 Compatibility with other functional safety standards
7.3.8 Joining E/E/PES
7.3.9 Alternate combinations of SRP/CS to achieve overall AgPL
7.4 Work products
29 Annex A (normative) Designated architectures for SRP/CS
36 Annex B (informative) Simplified method to estimate channel MTTFDC
40 Annex C (informative) Determination of diagnostic coverage (DC)
45 Annex D (informative) Estimates for common-cause failure (CCF)
47 Annex E (informative) Systematic failure
50 Annex F (informative) Characteristics of safety-related functions that are often fundamental to risk reduction
53 Annex G (informative) Example of a risk analysis
58 Annex H (normative) Compatibility with other functional safety standards
60 Annex I (informative) Joined systems alternative compliance method
61 Annex J (normative) Alternate combinations of SRP/CS to achieve overall AgPL
63 Bibliography

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BS EN ISO 25119-2:2023
$198.66