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BS EN 16590-2:2014

BS EN 16590-2:2014

$189.07

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

Published By Publication Date Number of Pages
BSI 2014 48
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This part of EN 16590 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 municipal equipment (e.g. street-sweeping machines). It specifies the characteristics and categories required of SRP/CS for carrying out their safety functions.

This part of EN 16590 is applicable to the safety-related parts of electrical/electronic/programmable electronic systems (E/E/PES), as these relate to mechatronic systems. It does not specify which safety functions, categories or performance levels are to be used for particular machines.

Machine specific standards (type-C standards) can identify performance levels and/or categories or they should be determined by the manufacturer of the machine based on risk assessment.

It is not applicable to non-E/E/PES systems (e.g. hydraulic, mechanic or pneumatic).

PDF Catalog

PDF Pages PDF Title
7 Foreword
8 Introduction
10 1 Scope
2 Normative references
3 Terms and definitions
4 Abbreviated terms
11 5 Concept — Unit of observation
5.1 Objectives
5.2 Prerequisites
5.3 Requirements
5.3.1 Unit of observation and ambient conditions
12 5.3.2 Limits of unit of observation and its interfaces with other units of observation
5.3.3 Sources of stress
5.3.4 Additional determinations
13 5.4 Work products
6 Risk analysis and method description
6.1 Objectives
6.2 Prerequisites
6.3 Requirements
6.3.1 Procedures for preparing a risk analysis
6.3.2 Tasks in risk analysis
6.3.3 Participants in risk analysis
6.3.4 Assessment and classification of a potential harm
14 Table 1 — Examples of the descriptions of injuries
6.3.5 Assessment of exposure in the situation observed
Table 2 — Exposure to the hazardous event
6.3.6 Assessment of a possible avoidance of harm
15 Table 3 — Possible avoidance of harm
6.3.7 Selecting the required AgPLr
16 Figure 1 — Determination of AgPLr
17 6.4 Work products
7 System design
7.1 Objectives
7.2 Prerequisites
7.3 Requirements
7.3.1 Assignment of AgPL
18 Figure 2 — Relationship between agricultural performance level, categories, DC, MTTFdC and SRL
7.3.2 Achieving the required AgPLr
19 Figure 3 — Diagram of combination of safety-related parts
7.3.3 Achievement of the performance level
7.4 Work products
20 Annex A (normative) Designated architectures for SRP/CS
A.1 General
A.2 Category B (basic)
21 A.3 Category 1
A.4 Category 2
Figure A.1 — Designated architecture for category 2
22 A.5 Category 3
23 Figure A.2 — Designated architecture for category 3
24 A.6 Category 4
Figure A.3 — Designated architecture for category 4
26 Annex B (informative) Simplified method to estimate channel MTTFdC
B.1 General
B.2 Component MTTFd values
B.2.1 Determination of component MTTFd values
27 B.2.2 MTTFd for components from B10
B.3 Parts count method
28 Table B.1 — Example MTTFdC calculation of circuit board
B.4 Calculation of symmetric MTTFdC for two-channel architectures
29 Annex C (informative) Determination of diagnostic coverage (DC)
C.1 General
C.2 Estimation of the required DC
Table C.1 — Electrical subsystems (without micro-controllers)
Table C.2 — Electronic subsystems (with micro-controllers)
30 Table C.3 — Processing units
Table C.4 — Invariable memory ranges
Table C.5 — Variable memory ranges
Table C.6 — I/O units and interface (external communication)
31 Table C.7 — Power supply (applies to system with and without micro-controllers)
C.3 Estimation of channel DC
Table C.8 — Estimated DC
32 C.4 Calculation of channel DC
C.5 Calculation of DC
Table C.9 — Calculated DC
33 Annex D (informative) Estimates for common-cause failure (CCF)
Table D.1 — Scoring process for measures against CCF
34 Table D.2 — Quantifying common-cause failure
35 Annex E (informative) Systematic failure
E.1 General
E.2 Procedure for the control of systematic failures
E.3 Procedure for the avoidance of systematic failures
38 Annex F (informative) Characteristics of safety functions
F.1 General
F.2 Start interlock
F.3 Stop function
F.4 Manual reset
39 F.5 Start and restart
F.6 Response time
F.7 Safety-related parameters
F.8 External control function
F.9 Muting (manual suspension of safety functions)
F.10 Operator warning
40 Annex G (informative) Example of a risk analysis
G.1 Workflow
G.2 Example risk analysis of an electro-hydraulic transmission for a self-propelled working machine (forage harvester) — Extract from a complete risk analysis
G.2.1 System description
41 Figure G.1 — Principal structure of the drive train
G.2.2 Surrounding conditions
G.2.3 System states and transitions
42 Figure G.2 — State flowchart
G.2.4 System failures
43 G.3 Assessment
G.3.1 System failure — Stops unintentionally
Table G.1 — System failure — Stops unintentionally
Table G.2 — Scenario 1
44 Table G.3 — Scenario 2
G.3.2 System failure — Does not move when commanded
G.4 Results
45 Annex ZA (informative) Relationship between this European Standard and the Essential Requirements of EU Machinery Directive 2006/42/EC
46 Bibliography

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BS EN 16590-2:2014
$189.07