kSIST FprEN ISO 6909:2026

SLOVENSKI STANDARD
oSIST prEN ISO 6909:2024
01-januar-2024
Varnost obdelovalnih strojev - Zavore stiskalnic (ISO/DIS 6909:2023)
Machine tools Safety - Press brakes (ISO/DIS 6909:2023)
Werkzeugmaschinen-Sicherheit - Gesenkbiegepressen (ISO/DIS 6909:2023)
Sécurité des machines outils - Presses plieuses (ISO/DIS 6909:2023)
Ta slovenski standard je istoveten z: prEN ISO 6909
ICS:
13.110 Varnost strojev Safety of machinery
25.080.01 Stroji na splošno Machine tools in general
oSIST prEN ISO 6909:2024 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

oSIST prEN ISO 6909:2024
oSIST prEN ISO 6909:2024
DRAFT INTERNATIONAL STANDARD
ISO/DIS 6909
ISO/TC 39/SC 10 Secretariat: SNV
Voting begins on: Voting terminates on:
2023-11-30 2024-02-22
Machine tools Safety — Press brakes
Sécurité des machines outils — Presses plieuses
ICS: 25.080.01; 13.110
This document is circulated as received from the committee secretariat.
THIS DOCUMENT IS A DRAFT CIRCULATED
FOR COMMENT AND APPROVAL. IT IS
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THEREFORE SUBJECT TO CHANGE AND MAY
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NATIONAL REGULATIONS.
ISO/DIS 6909:2023(E)
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. © ISO 2023

oSIST prEN ISO 6909:2024
ISO/DIS 6909:2023(E)
DRAFT INTERNATIONAL STANDARD
ISO/DIS 6909
ISO/TC 39/SC 10 Secretariat: SNV
Voting begins on: Voting terminates on:

Machine tools Safety — Press brakes
Sécurité des machines outils — Presses plieuses
ICS: 25.080.01; 13.110
This document is circulated as received from the committee secretariat.
THIS DOCUMENT IS A DRAFT CIRCULATED
FOR COMMENT AND APPROVAL. IT IS
© ISO 2023
ISO/CEN PARALLEL PROCESSING
THEREFORE SUBJECT TO CHANGE AND MAY
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
NOT BE REFERRED TO AS AN INTERNATIONAL
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NATIONAL REGULATIONS.
Website: www.iso.org ISO/DIS 6909:2023(E)
RECIPIENTS OF THIS DRAFT ARE INVITED
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TO SUBMIT, WITH THEIR COMMENTS,
NOTIFICATION OF ANY RELEVANT PATENT
RIGHTS OF WHICH THEY ARE AWARE AND TO
ii
PROVIDE SUPPORTING DOCUMENTATION. © ISO 2023

oSIST prEN ISO 6909:2024
ISO/DIS 6909:2023(E)
Contents Page
Foreword .v
Introduction . vi
1 Scope . 1
2 Normative references . 2
3 Terms and definitions . 4
4 List of significant hazards .14
5 Safety requirements and/or measures .14
5.1 General . 14
5.2 Protection of mechanical hazards . 15
5.2.1 Description of the safeguarding of access to moving parts .15
5.2.2 Location of the safeguarding of access to moving parts . .26
5.3 Control systems .28
5.3.1 General .28
5.3.2 Manual control devices .28
5.3.3 Failure of power supply .29
5.3.4 Protection against external influences .29
5.3.5 Safety functions .29
5.3.6 Other functions .54
5.3.7 Use of electronic components .56
5.4 Mode of operation . 56
5.4.1 Description of the various modes of operation .56
5.4.2 Setting mode .56
5.4.3 Production modes . 57
5.5 Consideration of basic design and other mechanical hazards . 57
5.5.1 Prevention of unintended gravity fall of the beam (down stroking press
brakes) . 57
5.5.2 Stability of the press brake .58
5.5.3 Stability of the workpiece.58
5.5.4 Risk of break up during operation .58
5.5.5 Tool holder and tool design .58
5.5.6 Access to raised work stations or platforms .58
5.5.7 Slips, trips and falls .58
5.5.8 Release of trapped persons .58
5.5.9 Safeguarding of drives, transmission machinery and ancillary devices . 59
5.6 Protection against non-mechanical hazard . 59
5.6.1 Noise . 59
5.6.2 Electrical hazards. 61
5.6.3 Ergonomics . 61
5.6.4 Hydraulic and pneumatic systems . 61
5.6.5 Thermal hazards . 62
5.6.6 Hazards generated by materials and substances. 62
5.6.7 Hazards generated by lasers.63
5.6.8 High pressure fluid ejection hazards .63
5.6.9 Isolation and energy dissipation .63
5.6.10 Maintenance .63
5.6.11 Errors of fitting .63
6 Verification of the safety requirements and/or protective measures .63
7 Information for use .67
7.1 Marking . 67
7.1.1 General . 67
7.1.2 Content . 67
7.2 Instruction handbook.68
iii
oSIST prEN ISO 6909:2024
ISO/DIS 6909:2023(E)
7.2.1 General .68
7.2.2 Content .68
Annex A (informative) Significant hazards, hazardous situations and protective measures .70
Annex B (normative) Calculation of minimum distances .74
Annex C (normative) The overall response time of the press brake stopping performance .77
Annex D (informative) Example of redundant and monitored hydraulic control circuits for
a down-stroking press brake.78
Annex E (normative) Conditions for noise measurement of press brakes .80
Annex F (informative) Side safeguarding for press brakes with manually loaded and/or
unloaded .81
Annex G (informative) Markings .82
Annex H (normative) Laser actuated AOPD system tests .83
Annex I (informative) Bending speed .85
Annex J (informative) Press Brakes Technologies .87
Annex ZA (informative) Relationship between this European Standard and the essential
requirements of EU Directive 2006/42/EC aimed to be covered .89
Bibliography .93
iv
oSIST prEN ISO 6909:2024
ISO/DIS 6909:2023(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).
ISO draws attention to the possibility that the implementation of this document may involve the use
of (a) patent(s). ISO takes no position concerning the evidence, validity or applicability of any claimed
patent rights in respect thereof. As of the date of publication of this document, ISO had not received
notice of (a) patent(s) which may be required to implement this document. However, implementers are
cautioned that this may not represent the latest information, which may be obtained from the patent
database available at www.iso.org/patents. ISO shall not be held responsible for identifying any or all
such patent rights.
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 39, Machine-outils, Subcommittee SC 10,
Safety.
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.
v
oSIST prEN ISO 6909:2024
ISO/DIS 6909:2023(E)
Introduction
This document is a type C standard as stated in ISO 12100:2010.
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.
The machinery concerned and the extent to which hazards, hazardous situations or hazardous events
are covered are indicated in the Scope of this document.
When requirements of this type-C standard are different from those which are stated in type-A or
type-B standards, the requirements of this type-C standard take precedence over the requirements of
the other standards for machines that have been designed and built according to the requirements of
this type-C standard.
vi
oSIST prEN ISO 6909:2024
DRAFT INTERNATIONAL STANDARD ISO/DIS 6909:2023(E)
Machine tools Safety — Press brakes
1 Scope
This document specifies technical safety requirements and measures to be adopted by persons
undertaking the design, manufacture and supply of press brakes which are intended to work cold metal
or material partly of cold metal but which can be used in the same way to work other sheet materials
(e.g. cardboard, plastic, rubber, leather, etc.) and also referred to as machines.
NOTE 1 The design of a machine includes the study of the machine itself, taking into account all phases of
the “life” of the machine mentioned in ISO 12100:2010, 5.4, and the drafting of the instructions related to all the
above phases.
This document covers the following types of machines (see Annex J):
— Hydraulic press brakes;
— Hydraulic servo-drive press brakes;
— Screw servo-drive press brakes;
— Belt-spring servo-drive press brakes.
The requirements in this document take account of intended use, as defined in ISO 12100:2010, 3.23,
as well as reasonably foreseeable misuse, as defined in ISO 12100:2010, 3.24. This document presumes
access to the press brake from all directions, deals with all significant hazards during the various
phases of the life of the machine described in Clause 4, and specifies the safety measures for both the
operator and other exposed persons.
NOTE 2 All significant hazards means those identified or associated with press brakes at the time of the
publication of this document.
This document applies to press brakes which can function independently or in combination (e.g. two
machines in tandem or more) and can also be used as a guide for the design of press brakes which are
intended to be integrated in a manufacturing system.
This document deals with the significant hazards, hazardous situations and events relevant to press
brakes and ancillary devices (see Clause 4). This document specifies the safety requirements for press
brakes defined in this clause.
This document does not cover press brakes which transmit energy to impart beam motion by using
pneumatic means or mechanical clutch or press brakes that use combination of technologies (e.g.
combined hydraulic and screw servo-drive press brake or combined hydraulic servo-drive and screw
servo-drive press brake).
This document does not cover machines whose principal designed purpose is:
a) sheet folding by rotary action;
b) tube and pipe bending by rotary action;
c) roll bending.
This document does not cover hazards related to the use of press brakes in explosive atmospheres.
This document is not applicable to press brakes which are manufactured before the date of its
publication.
oSIST prEN ISO 6909:2024
ISO/DIS 6909:2023(E)
This document does not cover the safety aspect of equipment for automatic loading and unloading
where provided. Guidance on how to take into account additional automatic loading and unloading
equipment can be found in ISO 11161:2007.
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 (including any amendments) applies.
ISO 3744:2010, Acoustics — Determination of sound power levels and sound energy levels of noise sources
using sound pressure — Engineering methods for an essentially free field over a reflecting plane
ISO 3746:2010, Acoustics — Determination of sound power levels and sound energy levels of noise sources
using sound pressure — Survey method using an enveloping measurement surface over a reflecting plane
ISO 4413:2010, Hydraulic fluid power — General rules and safety requirements for systems and their
components
ISO 4414:2010, Pneumatic fluid power — General rules and safety requirements for systems and their
components
ISO 4871:1996, Acoustics — Declaration and verification of noise emission values of machinery and
equipment
ISO 9355-1:1999, Ergonomic requirements for the design of displays and control actuators — Part 1:
Human interactions with displays and control actuators
ISO 9355-2:1999, Ergonomic requirements for the design of displays and control actuators — Part 2:
Displays
ISO 9355-3:1999, Ergonomic requirements for the design of displays and control actuators — Part 3:
Control actuators
ISO 11202:2010, Acoustics — Noise emitted by machinery and equipment — Determination of emission
sound pressure levels at a work station and at other specified positions applying approximate environmental
corrections
ISO 12100:2010, Safety of machinery — General principles for design — Risk assessment and risk reduction
ISO 13732-1:2006, Ergonomics of the thermal environment — Methods for the assessment of human
responses to contact with surfaces — Part 1: Hot surfaces
ISO 13849-1:2015, Safety of machinery — Safety-related parts of control systems — Part 1: General
principles for design
ISO 13849-2:2012, Safety of machinery — Safety-related parts of control systems — Part 2: Validation
ISO 13850:2015, Safety of machinery — Emergency stop function — Principles for design
ISO 13851:2019, Safety of machinery — Two-hand control devices — Functional aspects and design
principles
ISO 13855:2010, Safety of machinery — Positioning of safeguards with respect to the approach speeds of
parts of the human body
ISO 13857:2019, Safety of machinery — Safety distances to prevent hazard zones being reached by upper
and lower limbs
ISO 14118:2017, Safety of machinery — Prevention of unexpected start-up
oSIST prEN ISO 6909:2024
ISO/DIS 6909:2023(E)
ISO 14119:2013, Safety of machinery — Interlocking devices associated with guards — Principles for
design and selection
ISO 14120:2015, Safety of machinery — Guards — General requirements for the design and construction of
fixed and movable guards
ISO 14122-1:2016, Safety of machinery — Permanent means of access to machinery — Part 1: Choice of
fixed means and general requirements of access
ISO 14122-2:2016, Safety of machinery — Permanent means of access to machinery — Part 2: Working
platforms and walkways
ISO 14122-3:2016, Safety of machinery — Permanent means of access to machinery — Part 3: Stairs,
stepladders and guard-rails
ISO 14122-4:2016, Safety of machinery — Permanent means of access to machinery — Part 4: Fixed ladders
ISO 14738:2002, Safety of machinery — Anthropometric requirements for the design of workstations at
machinery
ISO/TR 11688-1:1995, Acoustics — Recommended practice for the design of low-noise machinery and
equipment — Part 1: Planning
ISO/TS 15066:2016, Robots and robotic devices — Collaborative robots
IEC 60204-1:2016, Safety of machinery — Electrical equipment of machines — Part 1: General requirements
IEC 60825-1:2014, Safety of laser products — Part 1: Equipment classification and requirements
IEC 60529:1989, Degrees of protection provided by enclosures (IP code)
IEC 60947-5-1:2016, Low-voltage switchgear and controlgear — Part 5-1: Control circuit devices and
switching elements — Electromechanical control circuit devices
IEC 61310-2:2007, Safety of machinery — Indication, marking and actuation — Part 2: Requirements for
marking
IEC 61496-1:2020, Safety of machinery — Electro-sensitive protective equipment — Part 1: General
requirements and test
IEC 61496-2:2020, Safety of machinery — Electro-sensitive protective equipment — Part 2: Particular
requirements for equipment using active opto-electronic protective devices (AOPDs)
IEC 61496-3:2018, Safety of machinery — Electro-sensitive protective equipment — Part 3: Particular
requirements for Active Opto-electronic Protective Devices responsive to Diffuse Reflection (AOPDDR)
IEC 61508-1:2010, Functional safety of electrical/electronic/programmable electronic safety-related
systems — Part 1: General requirements
IEC 61508-2:2010, Functional safety of electrical/electronic/programmable electronic safety-related
systems — Part 2: Requirements for electrical/electronic/programmable electronic safety-related systems
IEC 61508-3:2010, Functional safety of electrical/electronic/programmable electronic safety-related
systems — Part 3: Software requirements
IEC 61800-5-2:2016, Adjustable speed electrical power drive systems — Part 5-2: Safety requirements —
Functional
IEC 62061:2021, Safety of machinery — Functional safety of safety-related control systems
E N 1005 -1:2001+A 1: 2008 , Safety of machinery — Human physical performance — Terms and definition
oSIST prEN ISO 6909:2024
ISO/DIS 6909:2023(E)
E N 1005 -2:2003+A 1: 2008 , Safety of machinery — Human physical performance — Manual handling of
machinery and component parts of machinery
E N 1005 -3:2002+A 1: 2008 , Safety of machinery — Human physical performance — Recommended force
limits for machinery operation
E N 1005 - 4:2005+A 1: 2008 , Safety of machinery — Human physical performance — Evaluation of working
postures and movements in relation to machinery
EN 1837:2020, Safety of machinery — Integral lighting of machines
EN 50370-1:2005, Electromagnetic compatibility (EMC) — Product family standard for machine tools —
Part 1: Emission
EN 50370-2:2003, Electromagnetic compatibility (EMC) — Product family standard for machine tools —
Part 2: Immunity
3 Terms and definitions
For the purposes of this document, the terms and definitions given in in ISO 12100:2010 apply.
ISO and IEC maintain terminology databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at https:// www .electropedia .org/
3.1
press brake
machine designed or intended to transmit energy to the moving part of the tools (3.13) principally for
the purpose of bending between narrow forming tools along straight lines
3.2
up-stroking press brake
press brake (3.1) in which the lower tool (3.13) moves upwards during the closing stroke
Note 1 to entry: The movement is reciprocal to a down-stroking press, see Figure 1.
3.3
down-stroking press brake
press brake (3.1) in which the upper tool (3.13) moves downwards during the closing stroke
oSIST prEN ISO 6909:2024
ISO/DIS 6909:2023(E)
Key
1 press cylinder 6 backgauge (3.53) 11 side safeguard
2 control panel 7 hydraulic system 12 light curtain (3.17)
3 electrical switch gear cabinet 8 beam (3.14) 13 frame
4 foot pedal 9 tools (3.13)
5 workpiece support 10 bed
Figure 1 — Example of a down-stroking hydraulic press brake
3.4
hydraulic press brake
press brake (3.1) utilising hydraulic power to impart movement of the beam (3.14) whose characteristics
are dependent on hydraulic valve(s)
Note 1 to entry: The hydraulic valve(s) includes servo-valve(s) and proportional control valve(s).
Note 2 to entry: Examples of characteristics are the speed, the pressure, the direction.
Note 3 to entry: Example of a down-stroking (3.3) hydraulic press brake (3.4), see Figure 1
3.5
hydraulic servo-drive press brake
press brake (3.1) utilising hydraulic power to impart movement of the beam (3.14) whose characteristics
are directly dependent on servo-pump(s) (3.31)
Note 1 to entry: Examples of characteristics are speed, pressure, direction.
3.6
screw servo-drive press brake
press brake (3.1) utilising servo-motor(s) and screw(s) to impart movement of the beam (3.14).
Note 1 to entry: The characteristics of movements (e.g. speed, force, direction) are directly dependent on servo-
motor(s)
oSIST prEN ISO 6909:2024
ISO/DIS 6909:2023(E)
Key
1 down-stroking beam 4 right side screw
2 bed 5 right side brake
3 left side servomotor
Figure 2 — Example of a down-stroking screw servo-drive press brake
3.7
belt-spring servo-drive press brake
press brake (3.1) utilising servo-motor(s), belt(s), pulley(s) and spring(s) to impart movement of the
beam (3.14).
Note 1 to entry: The characteristics of movements (e.g. speed, force, direction) are directly dependent on servo-
motor(s)
oSIST prEN ISO 6909:2024
ISO/DIS 6909:2023(E)
Key
1 down-stroking beam 5 right side belt
2 bed 6 idle pulley mounted on the beam
3 left side servomotor 7 idle pulley mounted on a fixed part
4 left side twin spring arrangement 8 attachment of the belt
Figure 3 — Example of a down-stroking belt-spring servo-drive press brake
3.8
tools area
area between moving and stationary tools
EXAMPLE Space between punch and die of a press brake.
3.9
ancillary device
any device intended for use with the press brake (3.1) and/or integrated with it
Note 1 to entry: Examples of these devices are backgauges (3.53), adjustable front sheet supports, tool loading
devices
3.10
dead centre(s)
point at which the tool (3.13), during its travel, is:
— either nearest/closest to the die (generally it corresponds to the end of the closing stroke), known
as the bottom dead centre (BDC);
— or furthest from the die (generally it corresponds to the end of the opening stroke), known as the
top dead centre (TDC)
Note 1 to entry: On an up stroking press brake (3.2), the centres are reversed.
3.11
guard locking
measures to maintain an interlocking guard in the closed position until the risk of injury from the
hazardous machine functions (3.46) has ceased
[SOURCE: ISO 16092-1:2017, 3.2.8, modified — “(3.4.3)” was deleted]
oSIST prEN ISO 6909:2024
ISO/DIS 6909:2023(E)
3.12
position switch
switch which is operated by a moving part of the machine when this part reaches or leaves a
predetermined position
3.13
tools
combination of punch and die
3.14
beam
main reciprocating press brake (3.1) member which normally holds the punch on a down-stroking press
brake (3.3), and which normally holds the die on an up-stroking press brake (3.2)
3.15
electro-sensitive protective equipment
ESPE
assembly of devices and/or components working together for protective tripping or presence-sensing
purposes comprising
— a sensing device;
— controlling monitoring devices;
— output devices;
— all interconnecting wiring.
[SOURCE: ISO 13855:2010, 3.1.4, modified — “at minimum” was deleted in the first part of the definition,
and the last list item replaced by 2 list items]
Note 1 to entry: For the purposes of this document, ESPE (3.15) covers AOPD (3.16), AOPDDR (3.19), laser actuated
AOPD (3.16).
3.16
active opto-electronic protective device
AOPD
device whose sensing function (3.46) is performed by opto-electronic emitting and receiving elements
detecting the interruption of optical radiation, generated within the device, by an opaque object present
in the specified detection zone
Note 1 to entry: IEC 61496–2:2020 gives detailed provisions.
[SOURCE: IEC 61496-2: 2020, 3.201]
3.17
light curtain
AOPD (3.16) comprising an integrated assembly of one or more emitting element(s) and one or more
receiving element(s) forming a detection zone with a detection capability specified by the supplier
[SOURCE: IEC 61496-2: 2020, definition 3.205]
3.18
blanking
optional function (3.46) that permits an object of a size greater than the detection capability of the
AOPD (3.16) to be located within the detection zone without causing an OFF-state of the OSSD(s) (3.49)
Note 1 to entry: Fixed blanking (3.18) is a technique wherein the locations of the blanked areas of the detection
zone do not change during operation. The detection capability of the other parts of the detection zone remains
unchanged.
Note 2 to entry: Floating blanking (3.18) is a technique wherein the blanked area of the detection zone follows the
location of a moving object(s) during operation. The detection capability of the other areas remains unchanged.
oSIST prEN ISO 6909:2024
ISO/DIS 6909:2023(E)
Note 3 to entry: Progressive blanking (3.18) also known as successive blanking (3.18) or sequential blanking
(3.18) is a particular blanking (3.18) technique related to laser actuated AOPD, where the blanking (3.18) is done
progressively at high speed, at less than 10 mm gap to the workpiece.
[SOURCE: ISO 16092-1:2017, 3.2.19]
3.19
active opto-electronic protective device responsive to diffuse reflection
AOPDDR
device, whose sensing function (3.46) is performed by opto-electronic emitting and receiving elements,
that detects the diffuse reflection of optical radiations generated within the device by an object present
in a detection zone specified in two dimensions
[SOURCE: IEC 61496-3:2018, 3.301]
3.20
monitoring
safety function (3.46) which ensures that a safety measure is initiated if the ability of a component or an
element to perform its function (3.46) is diminished, or if the process conditions are changed in such a
way that hazards are generated
[SOURCE: ISO 16092-1:2017, 3.3.1, modified — “(3.4.3)” was deleted]
3.21
muting
temporary automatic suspension of a safety function(s) (3.46) by safety-related parts of the control
system during otherwise safe conditions in the operation of a machine
[SOURCE: ISO 16092-1:2017, 3.3.2, modified — “(3.4.3)” was deleted]
3.22
overall system stopping performance
overall response time
time occurring from actuating the protective device to the cessation of hazardous motion, or to the
machine assuming a safe condition
[SOURCE: ISO 16092-1:2017, 3.3.3, modified — “press (3.1.1)” was replaced with “machine”]
3.23
reset
function (3.46) within the SRP/CS (3.50) used to restore manually one or more safety functions (3.46)
before re-starting a machine
[SOURCE: ISO 16092-1:2017, 3.3.4, modified — “(3.4.3)” was deleted]
3.24
restraint valve
hydraulic device which protects against a gravity fall of the beam (3.14)
3.25
brake
mechanism for slowing, stopping and holding the beam (3.14)
3.26
mechanical brake
brake (3.25) using dry or fluid friction
3.27
moving direction monitoring
monitoring function (3.46) which monitors the beam (3.14) moving direction, directly or indirectly
oSIST prEN ISO 6909:2024
ISO/DIS 6909:2023(E)
3.28
standstill monitoring
monitoring function (3.46) which monitors the beam (3.14) position, directly or indirectly
3.29
stopping-performance (overrun) monitoring
monitoring function (3.46) which monitors the beam (3.14) stopping time or distance
3.30
servo drive system
system directly connecting a servo motor to the transmission system such as gear (motor reducer),
timing belt drive mechanism, mechanical link, ball screw, harmonic drive reducer, etc.
3.31
servo pump
hydraulic pump driven by a servo motor
3.32
protective stop (function)
stop function (3.46) initiated by a protective measure
3.33
safe energized standstill
safety function (3.46) preventing an unexpected movement of the beam (3.14) of more than a defined
amount from the stopped position, with energy supplied to the servomotor(s) to resist to external
forces, and without actuation of the mechanical brake(s) (3.25) or the hydraulic/mechanical restraint
device(s)
3.34
safe de-energized standstill
safety function (3.46) preventing an unexpected movement of the beam (3.14) by removing the energy
supply to the servomotor(s) and either the mechanical brake(s) (3.25) or the hydraulic/mechanical
restraint device(s)
3.35
safe stop (function)
stop function (3.46) initiated by a monitoring (3.20) function (3.46)
3.36
safe torque off
STO
function (3.46) which prevents force-producing power from being provided to the servo-motor
Note 1 to entry: For details, see also IEC 61800-5-2:2016, 4.2.3.2
3.37
worst case
condition of the press brake (3.1) when it would be under foreseeably unfavourable situations
EXAMPLE The press beam (3.14) is in its most disadvantageous position, with a tool (3.13) of maximum
weight being used, etc.
3.38
operating mode
specific manner of operation of a press brake (3.1) or press brake production system determined by the
control system
Note 1 to entry: For specifications on safety facilities and security measures relating to different operating
modes, see Clause 5.
oSIST prEN ISO 6909:2024
ISO/DIS 6909:2023(E)
3.39
OFF
operating mode (3.38) in which the press brake (3.1) is rendered inoperative
3.40
single cycle
operating mode (3.38) where each operating cycle of the beam (3.14) is positively actuated by the
operator
3.41
single stroke function
function (3.46) used to limit the motion of the tool (3.13) to one operating cycle even if the stroke
initiating means is held in the operating position
Note 1 to entry: Initiating mean can be a foot pedal
3.42
automatic cycle
operating mode (3.38) where the operating cycle is repeated continuously or intermittently, all functions
(3.46) achieved without manual intervention after initiation
3.43
light curtain single break
single cycle where a light curtain (3.17) is used for cycle initiation after clearing the light curtain (3.17)
following a single interruption for manual loading and unloading
3.44
light curtain double break
single cycle where a light curtain (3.17) is used for cycle initiation after clearing the light curtain (3.17)
following a double interruption for manual loading and unloading
3.45
operating mode selection device
facility consisting of an access, selection and activation system for manual selection of the machine’s
operating mode (3.38) to which only a restricted group of persons has access
[SOURCE: ISO 16092-1:2017, 3.4.2, modified — “(3.4.1)” and Note 1 were deleted]
3.46
function
operation of a machine or a part of a machine which is specific or required for the intended machine
task
[SOURCE: ISO 16092-1:2017, 3.4.3]
3.47
cycle
complete movement of the beam (3.14) and other devices of the press brake (3.1) used for production
EXAMPLE Ancillary devices (3.9) including feeding and removal of the material or workpiece along a
programmed motion path from the programmed start position (TDC (3.10)) back to the programmed end
position (TDC (3.10))
3.48
programmable electronic system
PES
system for control, protection or monitoring based on one or more programmable electronic devices,
including all elements of the system such as power supplies, sensors and other input devices, data
highways and other communication paths, and actuators and other output devices
[SOURCE: IEC 61508-4:2010, 3.3.1, modified — “(see Figure 2)”, Note to entry and Figure 2 were
deleted.]
oSIST prEN ISO 6909:2024
ISO/DIS 6909:2023(E)
3.49
output signal switching device
OSSD
component of the ESPE (3.15) connected to the machine control system which, when the sensing device
is actuated during normal operation, responds by going to the OFF-state
[SOURCE: IEC 61496-1:2020, 3.19]
3.50
safety-related part of a control system
SRP/CS
part of a control system that responds to safety related input signals and generates safety related
output signals
Note 1 to entry: the combined safety related parts of a control system start at the point where the safety related
input signals are initiated (including, for example, the actuating cam and the roller of the position switch) and
end at the output of the power control elements (including, for example, the main contact of a contactor)
Note 2 to entry: If monitoring systems are used for diagnostics, they are also considered as SRP/CS (3.50).
[SOURCE: ISO 13849-1:2015, 3.1.1]
Note 3 to entry: SRP/CS (3.50) generally use mechanical, hydraulic, electrical, pneumatic or software parts
3.51
overrun monitoring device
device which provides a signal to inhibit further complete stroke when the overrun exceeds the pre-set
limit(s)
3.52
bending plane
vertical plane passing through the first contact line with the material from the upper tool (3.13) nearest
to the operator
3.53
backgauge
mechanism comprising all necessary parts to move backgauge finger(s) (3.54), including transmission
parts and mobile supports of backgauge finger(s)
Note 1 to entry: See Figure 4
oSIST prEN ISO 6909:2024
ISO/DIS 6909:2023(E)
Figure 4 — Example of a backgauge for a press brake
3.54
backgauge finger
mechanical part moved by
...