FprEN ISO 25119-2
(Main)Tractors and machinery for agriculture and forestry - Safety-related parts of control systems - Part 2: Concept phase (ISO 25119-2:2019)
Tractors and machinery for agriculture and forestry - Safety-related parts of control systems - Part 2: Concept phase (ISO 25119-2:2019)
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.
Traktoren und Maschinen für die Land- und Forstwirtschaft - Sicherheitsbezogene Teile von Steuerungen - Teil 2: Konzeptphase (ISO 25119-2:2019)
Dieses Dokument beschreibt die Konzeptphase der Entwicklung sicherheitsbezogener Teile von Steuerungen (SRP/CS) in land- und forstwirtschaftlichen Traktoren, selbstfahrenden Aufsitzmaschinen sowie Anbau-, Aufsattel- und Anhängemaschinen für landwirtschaftliche Geräte. Sie kann auch auf fahrbare kommunale Geräte (z. B. Straßenkehrmaschinen) angewendet werden.
Dieses Dokument gilt nicht für:
— Flugzeuge und Luftkissenfahrzeuge für den landwirtschaftlichen Einsatz;
— Rasen- und Gartengeräte.
Dieses Dokument legt die Merkmale und Kategorien von SRP/CS-Systemen fest, die zur Ausführung von Sicherheitsfunktionen erforderlich sind. Es enthält keine Performance Level für bestimmte Anwendungen.
ANMERKUNG 1 Maschinenspezifische Typ C Normen können Performance Level (AgPL) für Sicherheitsfunktionen von Maschinen in ihrem Anwendungsbereich festlegen. Andernfalls ist der Hersteller für die Festlegung des AgPL verantwortlich.
Dieses Dokument gilt für sicherheitsbezogene Teile elektrischer/elektronischer/programmierbarer elektronischer Systeme (E/E/PES) als Teil mechatronischer Systeme. Es behandelt die möglichen Gefahren durch Fehlfunktionen von sicherheitsbezogenen E/E/PES einschließlich der Wechselwirkungen dieser Systeme. Das Dokument behandelt nicht Gefahren in Verbindung mit Stromschlag, Feuer, Rauch, Hitze, Strahlung, Toxizität, Entflammbarkeit, Reaktivität, Korrosion, Freisetzung von Energie usw., soweit diese nicht direkt durch eine Fehlfunktion der sicherheitsbezogenen Systeme von E/E/PES verursacht werden. Darüber hinaus behandelt das Dokument die Fehlfunktionen sicherheitsbezogener Systeme von E/E/PES, die an Schutzmaßnahmen, Schutzeinrichtungen oder Sicherheitsfunktionen als Reaktion auf nicht durch E/E/PES verursachte Gefahren beteiligt sind.
Im Anwendungsbereich dieses Dokuments enthaltene Beispiele sind:
— sicherheitsbezogene Teile einer Steuerung (SRP/CS), die den Stromfluss in elektrischen Hybridsystemen begrenzen, um Isolierungsausfälle und Gefahren durch elektrischen Schlag zu verhindern;
— elektromagnetische Störungen mit dem SRP/CS;
— für Brandschutzzwecke gestaltete SRP/CS.
Im Anwendungsbereich dieses Dokuments nicht enthaltene Beispiele sind:
— Isolierungsausfälle durch Reibung, die zu der Gefahr eines elektrischen Schlags führen;
— elektromagnetische Nennstrahlung, die nahegelegene Maschinensteuerungssysteme beeinflusst;
— Korrosion, die zu einer Überhitzung von Stromkabeln führt.
Sie ist nicht anzuwenden auf Nicht-E/E/PES-Systeme (z. B. hydraulische, mechanische und pneumatische).
ANMERKUNG 2 Siehe auch EN ISO 12100 zu Gestaltungsleitsätzen für die Sicherheit von Maschinen.
Dieses Dokument gilt nicht für sicherheitsbezogene Teile von Steuerungen, die vor dem Veröffentlichungsdatum dieses Dokuments hergestellt wurden.
Tracteurs et matériels agricoles et forestiers - Parties des systèmes de commande relatives à la sécurité - Partie 2: Phase de projet (ISO 25119-2:2019)
Le présent document spécifie la phase de conception du développement des parties relatives à la sécurité des systèmes de commande (SRP/CS) utilisés sur les tracteurs agricoles et forestiers, sur les machines automotrices à conducteur porté et sur les machines portées, semi-portées et traînées utilisées en agriculture. Il peut également s'appliquer aux équipements municipaux mobiles (par exemple machines de nettoiement).
Le présent document ne s'applique pas:
— aux véhicules aéroportés et sur coussin d'air utilisés en agriculture,
— aux équipements de jardinage ou horticoles.
Le présent document spécifie les caractéristiques et les catégories requises des SRP/CS pour réaliser leurs fonctions relatives à la sécurité. Il n'identifie pas de niveaux de performance pour des applications spécifiques.
NOTE 1 Les normes spécifiques à une machine donnée (normes de type C) peuvent spécifier des niveaux de performance (AgPL) pour des fonctions relatives à la sécurité dans des machines relevant de leur domaine d'application. Sinon, la spécification de l'AgPL est de la responsabilité du fabricant.
Le présent document s'applique aux parties relatives à la sécurité des systèmes électriques/électroniques/électroniques programmables (E/E/PES), dans la mesure où celles-ci sont liées aux systèmes mécatroniques. Il couvre les éventuels phénomènes dangereux dus au dysfonctionnement de systèmes E/E/PES relatifs à la sécurité, y compris l'interaction entre ces systèmes. Il ne traite pas des phénomènes dangereux associés aux événements suivants: choc électrique, incendie, fumées, chaleur, rayonnement, toxicité, inflammabilité, réactivité, corrosion, libération d'énergie et phénomènes dangereux similaires, à moins qu'ils ne soient causés directement par un dysfonctionnement des systèmes E/E/PES relatifs à la sécurité. Il couvre également le dysfonctionnement des systèmes E/E/PES relatifs à la sécurité qui sont impliqués dans les mesures de protection, protecteurs ou fonctions relatives à la sécurité en réponse aux phénomènes dangereux hors E/E/PES.
Exemples faisant partie du domaine d'application du présent document:
— SRP/CS limitant le flux de courant dans les hybrides électriques pour empêcher les phénomènes dangereux de panne d'isolement/choc;
— interférence électromagnétique avec les SRP/CS; et
— SRP/CS conçues pour empêcher les incendies.
Exemples ne faisant pas partie du domaine d'application:
— panne d'isolement due au frottement qui engendre des phénomènes de chocs électriques;
— rayonnement électromagnétique nominal qui impacte les systèmes de commande environnants de la machine;
— corrosion engendrant une surchauffe des câbles électriques.
Le présent document n'est pas applicable aux systèmes non E/E/PES (par exemple hydraulique, mécanique et pneumatique).
NOTE 2 Pour les principes de conception relatifs à la sécurité des machines, voir également l'ISO 12100.
Le présent document n'est pas applicable aux parties relatives à la sécurité des systèmes de commande fabriqués avant la date de sa publication.
Traktorji ter kmetijski in gozdarski stroji - Varnostni deli krmilnih sistemov - 2. del: Faza koncepta (ISO 25119-2:2019)
General Information
Standards Content (Sample)
SLOVENSKI STANDARD
oSIST prEN ISO 25119-2:2022
01-januar-2022
Traktorji ter kmetijski in gozdarski stroji - Varnostni deli krmilnih sistemov - 2. del:
Faza koncepta (ISO 25119-2:2019)
Tractors and machinery for agriculture and forestry - Safety-related parts of control
systems - Part 2: Concept phase (ISO 25119-2:2019)
Traktoren und Maschinen für die Land- und Forstwirtschaft - Sicherheitsbezogene Teile
von Steuerungen - Teil 2: Konzeptphase (ISO 25119-2:2019)
Tracteurs et matériels agricoles et forestiers - Parties des systèmes de commande
relatives à la sécurité - Partie 2: Phase de projet (ISO 25119-2:2019)
Ta slovenski standard je istoveten z: prEN ISO 25119-2
ICS:
35.240.99 Uporabniške rešitve IT na IT applications in other fields
drugih področjih
65.060.01 Kmetijski stroji in oprema na Agricultural machines and
splošno equipment in general
oSIST prEN ISO 25119-2:2022 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
---------------------- Page: 1 ----------------------
oSIST prEN ISO 25119-2:2022
---------------------- Page: 2 ----------------------
oSIST prEN ISO 25119-2:2022
DRAFT
EUROPEAN STANDARD
prEN ISO 25119-2
NORME EUROPÉENNE
EUROPÄISCHE NORM
November 2021
ICS 35.240.99; 65.060.01
English Version
Tractors and machinery for agriculture and forestry -
Safety-related parts of control systems - Part 2: Concept
phase (ISO 25119-2:2019)
Tracteurs et matériels agricoles et forestiers - Parties Traktoren und Maschinen für die Land- und
des systèmes de commande relatives à la sécurité - Forstwirtschaft - Sicherheitsbezogene Teile von
Partie 2: Phase de projet (ISO 25119-2:2019) Steuerungen - Teil 2: Konzeptphase (ISO 25119-
2:2019)
This draft European Standard is submitted to CEN members for enquiry. It has been drawn up by the Technical Committee
CEN/TC 144.
If this draft becomes a European Standard, CEN members are bound to comply with the CEN/CENELEC Internal Regulations
which stipulate the conditions for giving this European Standard the status of a national standard without any alteration.
This draft European Standard was established by CEN in three official versions (English, French, German). A version in any other
language made by translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC
Management Centre has the same status as the official versions.
CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,
Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and
United Kingdom.
Recipients of this draft are invited to submit, with their comments, notification of any relevant patent rights of which they are
aware and to provide supporting documentation.
Warning : This document is not a European Standard. It is distributed for review and comments. It is subject to change without
notice and shall not be referred to as a European Standard.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2021 CEN All rights of exploitation in any form and by any means reserved Ref. No. prEN ISO 25119-2:2021 E
worldwide for CEN national Members.
---------------------- Page: 3 ----------------------
oSIST prEN ISO 25119-2:2022
prEN ISO 25119-2:2021 (E)
Contents Page
European foreword .3
Annex ZA (informative) Relationship between this European Standard and the essential
requirements of Directive 2006/42/EC aimed to be covered . 4
2
---------------------- Page: 4 ----------------------
oSIST prEN ISO 25119-2:2022
prEN ISO 25119-2:2021 (E)
European foreword
The text of ISO 25119-2:2019 has been prepared by Technical Committee ISO/TC 23 “Tractors and
machinery for agriculture and forestry” of the International Organization for Standardization (ISO) and
has been taken over as prEN ISO 25119-2:2021 by Technical Committee CEN/TC 144 “Tractors and
machinery for agriculture and forestry” the secretariat of which is held by AFNOR.
This document is currently submitted to the CEN Enquiry.
This document has been prepared under a mandate given to CEN by the European Commission and the
European Free Trade Association, and supports essential requirements of EU Directive.
For relationship with EU Directive, see informative Annex ZA, which is an integral part of this
document.
Endorsement notice
The text of ISO 25119-2:2019 has been approved by CEN as prEN ISO 25119-2:2021 without any
modification.
3
---------------------- Page: 5 ----------------------
oSIST prEN ISO 25119-2:2022
prEN ISO 25119-2:2021 (E)
Annex ZA
(informative)
Relationship between this European Standard and the essential
requirements of Directive 2006/42/EC aimed to be covered
This European Standard has been prepared under a Commission’s standardization request “M/396
Mandate to CEN and CENELEC for Standardisation in the field of machinery" to provide one voluntary
means of conforming to essential requirements of Directive 2006/42/EC of the European Parliament
and of the Council of 17 May 2006 on machinery, and amending Directive 95/16/EC (recast).
Once this standard is cited in the Official Journal of the European Union under that Directive,
compliance with the normative clauses of this standard given in Table ZA.1 confers, within the limits of
the scope of this standard, a presumption of conformity with the corresponding essential requirements
of that Directive, and associated EFTA regulations.
Table ZA.1— Correspondence between this European Standard and Annex I of Directive
2006/42/EC
The relevant Essential Clauses/sub-clauses of EN ISO 25119-2 Remarks/Notes
Requirements of Directive
2006/42/EC
1.1.2. Principles of safety integration
1.1.2 (a) 5.3, 6.3, 7.3, A.1, A.2, A.3, A.4, A.5, A.6, H.2, H.3, H.4,
H.5
1.1.2 (c) 5.3, 6.3, 7.3, A.1, A.2, A.3, A.4, A.5, A.6, H.2, H.3, H.4,
H.5
1.2.1. Safety and reliability of control 5.3, 6.3.2, 7.3.2, 7.3.5, A.1, A.2, A.3, A.4, A.5, A.6
systems
1.2.3. Starting 6.3.2, 7.3, A.5, A.6
1.2.4.1. Normal stop 6.3.2, 7.3
1.2.4.2. Operational stop 6.3.2, 7.3
1.2.4.3. Emergency stop 6.3.2, 7.3
1.2.5. Selection of control or 5.3.3, 6.3.2, 7.3
operating modes
1.2.6. Failure of the power supply 6.3.2, 7.3
1.6.3. Isolation of energy sources 6.3.2, 7.3
WARNING 1 — Presumption of conformity stays valid only as long as a reference to this European
Standard is maintained in the list published in the Official Journal of the European Union. Users of this
standard should consult frequently the latest list published in the Official Journal of the European
Union.
WARNING 2 — Other Union legislation may be applicable to the product(s) falling within the scope of
this standard.
4
---------------------- Page: 6 ----------------------
oSIST prEN ISO 25119-2:2022
INTERNATIONAL ISO
STANDARD 25119-2
Third edition
2019-08
Tractors and machinery for
agriculture and forestry — Safety-
related parts of control systems —
Part 2:
Concept phase
Tracteurs et matériels agricoles et forestiers — Parties des systèmes
de commande relatives à la sécurité —
Partie 2: Phase de projet
Reference number
ISO 25119-2:2019(E)
©
ISO 2019
---------------------- Page: 7 ----------------------
oSIST prEN ISO 25119-2:2022
ISO 25119-2:2019(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2019
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting
on the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address
below or ISO’s member body in the country of the requester.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: +41 22 749 01 11
Fax: +41 22 749 09 47
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii © ISO 2019 – All rights reserved
---------------------- Page: 8 ----------------------
oSIST prEN ISO 25119-2:2022
ISO 25119-2:2019(E)
Contents Page
Foreword .v
Introduction .vi
1 Scope . 1
2 Normative references . 2
3 Terms and definitions . 2
4 Abbreviated terms . 2
5 Concept — UoO . 3
5.1 Objectives. 3
5.2 Prerequisites . 3
5.3 Requirements . 3
5.3.1 Basic requirements and ambient conditions . 3
5.3.2 Limits of UoO and its interfaces with other UoO . 4
5.3.3 Mapping and allocation of relevant functions to involved UoO, sources of stress . 4
5.3.4 Additional determinations . 4
5.4 Work products . 4
6 HARA — Determination of the AgPL . 5
r
6.1 Objectives. 5
6.2 Prerequisites . 5
6.3 Requirements . 5
6.3.1 Procedures for preparing a HARA . 5
6.3.2 Tasks in the HARA . 5
6.3.3 Participants in HARA . . 5
6.3.4 Classification of a potential harm . 5
6.3.5 Classification of exposure in the situation observed . 6
6.3.6 Classification of a possible avoidance of harm . 6
6.3.7 Selecting the AgPL .
r 7
6.4 Work products . 9
7 Functional safety concept. 9
7.1 Objectives. 9
7.2 Prerequisites . 9
7.3 Requirements . 9
7.3.1 Safety goals . 9
7.3.2 Functional safety requirements . 9
7.3.3 Value of MTTF .10
D
7.3.4 Value of DC .10
7.3.5 Selection of categories, MTTF , DC and SRL .10
DC
7.3.6 Achieving the AgPL .11
r
7.3.7 Compatibility with other functional safety standards .12
7.3.8 Joining E/E/PES.12
7.3.9 Alternate combinations of SRP/CS to achieve overall AgPL.12
7.4 Work products .12
Annex A (normative) Designated architectures for SRP/CS.13
Annex B (informative) Simplified method to estimate channel MTTF .20
DC
Annex C (informative) Determination of diagnostic coverage (DC) .24
Annex D (informative) Estimates for common-cause failure (CCF) .29
Annex E (informative) Systematic failure .31
Annex F (informative) Characteristics of safety-related functions that are often
fundamental to risk reduction .34
© ISO 2019 – All rights reserved iii
---------------------- Page: 9 ----------------------
oSIST prEN ISO 25119-2:2022
ISO 25119-2:2019(E)
Annex G (informative) Example of a risk analysis .37
Annex H (normative) Compatibility with other functional safety standards .42
Annex I (informative) Joined systems alternative compliance method .44
Annex J (normative) Alternate combinations of SRP/CS to achieve overall AgPL .45
Bibliography .47
iv © ISO 2019 – All rights reserved
---------------------- Page: 10 ----------------------
oSIST prEN ISO 25119-2:2022
ISO 25119-2:2019(E)
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards
bodies (ISO member bodies). The work of preparing International Standards is normally carried out
through ISO technical committees. Each member body interested in a subject for which a technical
committee has been established has the right to be represented on that committee. International
organizations, governmental and non-governmental, in liaison with ISO, also take part in the work.
ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of
electrotechnical standardization.
The procedures used to develop this document and those intended for its further maintenance are
described in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the
different types of ISO documents should be noted. This document was drafted in accordance with the
editorial rules of the ISO/IEC Directives, Part 2 (see www .iso .org/directives).
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of
any patent rights identified during the development of the document will be in the Introduction and/or
on the ISO list of patent declarations received (see www .iso .org/patents).
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and
expressions related to conformity assessment, as well as information about ISO's adherence to the
World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT) see www .iso
.org/iso/foreword .html.
This document was prepared by Technical Committee ISO/TC 23, Tractors and machinery for agriculture
and forestry, Subcommittee SC 19, Agricultural electronics.
This third edition cancels and replaces the second edition (ISO 25119-2:2018), of which it constitutes a
minor revision. The changes compared to the previous edition are as follows.
— A minor revision was made to Annex H to improve the clarity and understanding of the requirements
to be followed by the end user about subsystems, elements, or components designed according to
ISO 26262.
A list of all parts in the ISO 25119 series can be found on the ISO website.
Any feedback or questions on this document should be directed to the user’s national standards body. A
complete listing of these bodies can be found at www .iso .org/members .html.
© ISO 2019 – All rights reserved v
---------------------- Page: 11 ----------------------
oSIST prEN ISO 25119-2:2022
ISO 25119-2:2019(E)
Introduction
ISO 25119 (all parts) sets out an approach to the assessment, design and verification, for all safety life
cycle activities, of safety-related parts comprising electrical and/or electronic and/or programmable
electronic systems (E/E/PES) 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 is also applicable
to mobile municipal equipment.
A prerequisite to the application of ISO 25119 (all parts) is the completion of a suitable hazard
identification and risk analysis (such as ISO 12100) for the entire machine. As a result, an E/E/PES
is frequently assigned to provide safety-related functions that create safety-related parts of control
systems (SRP/CS). These can consist of hardware or software, can be separate or integrated parts of
a control system, and can either perform solely safety-related functions or form part of an operational
function.
In general, the designer (and to some extent, the user) will combine the design and validation of these
SRP/CS as part of the risk assessment. The objective is to reduce the risk associated with a given hazard
(or hazardous situation) under all conditions of use of the machine. This can be achieved by applying
various measures (both SRP/CS and non-SRP/CS) with the end result of achieving a safe condition.
ISO 25119 (all parts) allocates the ability of safety-related parts to perform a safety-related function
under foreseeable conditions into five performance levels. The performance level of a controlled
channel depends on several factors, including system structure (category), the extent of fault detection
mechanisms (diagnostic coverage), the reliability of components (mean time to dangerous failure,
common-cause failure), design processes, operating stress, environmental conditions and operation
procedures. Three types of failures that can cause E/E/PES malfunctions leading to potential hazardous
situations are considered: systematic, common-cause and random.
In order to guide the designer during design, verification, and to facilitate the assessment of the achieved
performance level, ISO 25119 (all parts) defines an approach based on a classification of architecture
with different design features and specific behaviour in case of a fault.
The performance levels and categories can be applied to the control systems of all kinds of mobile
machines: from simple systems (such as auxiliary valves) to complex systems (such as steer by wire), as
well as to the control systems of protective equipment (such as interlocking devices, pressure sensitive
devices).
ISO 25119 (all parts) adopts a risk-based approach for the determination of the risks, while providing a
means of specifying the required performance level for the safety-related functions to be implemented
by E/E/PES safety-related channels. It gives requirements for the whole safety life-cycle of E/E/PES
(design, validation, production, operation, maintenance, decommissioning), necessary for achieving the
required functional safety for E/E/PES that are linked to the performance levels.
The structure of safety standards in the field of machinery is as follows.
a) Type-A standards (basic safety standards) give basic concepts, principles for design and general
aspects that can be applied to machinery.
b) Type-B standards (generic safety standards) deal with one or more safety aspect(s), or one or more
type(s) of safeguards that can be used across a wide range of machinery:
— type-B1 standards on particular safety aspects (e.g. safety distances, surface temperature, noise);
— type-B2 standards on safeguards (e.g. two-hand controls, interlocking devices, pressure
sensitive devices, guards).
c) Type-C standards (machinery safety standards) deal with detailed safety requirements for a
particular machine or group of machines.
This document is a type-B1 standard as stated in ISO 12100.
vi © ISO 2019 – All rights reserved
---------------------- Page: 12 ----------------------
oSIST prEN ISO 25119-2:2022
ISO 25119-2:2019(E)
This document is of relevance, in particular, for the following stakeholder groups representing the
market players with regard to machinery safety:
— machine manufacturers (small, medium and large enterprises);
— health and safety bodies (regulators, accident prevention organizations, market surveillance, etc.).
Others can be affected by the level of machinery safety achieved with the means of the document by the
above-mentioned stakeholder groups:
— machine users/employers (small, medium and large enterprises);
— machine users/employees (e.g. trade unions, organizations for people with special needs);
— service providers, e.g. for maintenance (small, medium and large enterprises);
— consumers (in case of machinery intended for use by consumers).
The above-mentioned stakeholder groups have been given the possibility to participate at the drafting
process of this document.
In addition, this document is intended for standardization bodies elaborating type-C standards.
The requirements of this document can be supplemented or modified by a type-C standard.
For machines which are covered by the scope of a type-C standard and which have been designed and
built according to the requirements of that standard, the requirements of that type-C standard take
precedence.
© ISO 2019 – All rights reserved vii
---------------------- Page: 13 ----------------------
oSIST prEN ISO 25119-2:2022
---------------------- Page: 14 ----------------------
oSIST prEN ISO 25119-2:2022
INTERNATIONAL STANDARD ISO 25119-2:2019(E)
Tractors and machinery for agriculture and forestry —
Safety-related parts of control systems —
Part 2:
Concept phase
1 Scope
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.
© ISO 2019 – All rights reserved 1
---------------------- Page: 15 ----------------------
oSIST prEN ISO 25119-2:2022
ISO 25119-2:2019(E)
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements of this document. For dated references, only the edition cited applies. For
undated references, the latest edition of the referenced document (inc
...
Questions, Comments and Discussion
Ask us and Technical Secretary will try to provide an answer. You can facilitate discussion about the standard in here.