ISO 22201-2:2013
(Main)Lifts (elevators), escalators and moving walks — Programmable electronic systems in safety related applications — Part 2: Escalators and moving walks (PESSRAE)
Lifts (elevators), escalators and moving walks — Programmable electronic systems in safety related applications — Part 2: Escalators and moving walks (PESSRAE)
ISO 22201-2:2013 is applicable to the product family of escalators and moving walks used in residential buildings, offices, hospitals, hotels, industrial plants, etc. It covers those aspects that need to be addressed when programmable electronic systems are used to carry out electric safety functions for escalators and moving walks (PESSRAE). It is applicable for escalator and moving walk safety functions that are identified in escalator and moving walk codes, standards, or laws that reference ISO 22201-2:2013 for PESSRAE application. The safety integrity levels (SILs) specified in ISO 22201-2:2013 are understood to be valid for PESSRAE application in the context of the referenced escalator and moving walk codes, standards, and laws in Annex B. ISO 22201-2:2013 is also applicable for the application of PESSRAE that are new or deviate from those described in ISO 22201-2:2013. The requirements of ISO 22201-2:2013 regarding electrical safety/protective devices are such that the possibility of a failure of an electric safety/protective device complying with all the requirements of the standard needs not to be taken into consideration. In particular, ISO 22201-2:2013: uses safety integrity levels (SIL) for specifying the target failure rate for the safety functions to be implemented by the PESSRAE; specifies the requirements for achieving safety integrity for a function but does not specify who is responsible for implementing and maintaining the requirements (for example, designers, suppliers, owner/operating company, contractor); this responsibility is assigned to different parties according to safety planning and national regulations; applies to PES used in escalator and moving walk applications that meet the minimum requirements of a recognized escalator and moving walk standards such as EN 115, ASME A17.1/CSA B44, or escalator and moving walk laws such as The Japan Building Standard Law Enforcement Order For Elevator and Escalator; defines the relationship between ISO 22201-2:2013 and IEC 61508 and defines the relationship between ISO 22201-2:2013 and the EMC Standard for Escalators and moving walks on immunity, ISO 22200; outlines the relationship between escalator and moving walk safety functions and their safe-state conditions; applies to phases and activities that are specific to design of hardware and software but not those phases and activities which occur post design, for example sourcing and manufacturing; requires the manufacturer of the PESSRAE to provide instructions that specify what is necessary to maintain the integrity of the PESSRAE (instruction manual) for organization carrying out the assembly, connections, adjustment and maintenance of the escalators and moving walks; provides requirements relating to the hardware and software safety validation; establishes the safety integrity levels for specific escalator and moving walk safety functions; specifies techniques/measures required for achieving the specified safety integrity levels; defines a maximum level of performance (SIL 3) which can be achieved for a PESSRAE according to ISO 22201-2:2013 and defines a minimum level of performance (SIL 1). ISO 22201-2:2013 does not cover: hazards arising from the PES equipment itself such as electric shock etc.; the concept of fail-safe that may be of value when the failure modes are well defined and the level of complexity is relatively low. The concept of fail-safe was considered inappropriate because of the full range of complexity of PESSRAE that are within the scope of ISO 22201-2:2013; other relevant requirements necessary for the complete application of a PESSRAE in a escalator and moving walk safety function such as system integration specifications, temperature and humidity, the mechanical construction, mounting and labelling of switches, actuators, or sensors that contain PESSRAE. These requirements are to be carried out in accordance with the national escalator and moving walk norm that refe
Ascenseurs, escaliers mécaniques et trottoirs roulants — Systèmes électroniques programmables dans les applications liées à la sécurité — Partie 2: Escaliers mécaniques et trottoirs roulants
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Standards Content (Sample)
INTERNATIONAL ISO
STANDARD 22201-2
First edition
2013-03-15
Lifts (elevators), escalators and
moving walks — Programmable
electronic systems in safety related
applications —
Part 2:
Escalators and moving walks (PESSRAE)
Ascenseurs, escaliers mécaniques et trottoirs roulants — Systèmes
électroniques programmables dans les applications liées à la sécurité —
Partie 2: Escaliers mécaniques et trottoirs roulants
Reference number
©
ISO 2013
© ISO 2013
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized otherwise in any form
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ii © ISO 2013 – All rights reserved
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Conformance . 2
3 Normative references . 2
4 Terms and definitions . 3
5 Symbols and abbreviated terms . 6
6 Requirements . 6
6.1 General . 6
6.2 Extended application of this International Standard . 7
6.3 Safety function SIL requirements . 7
6.4 SIL relevant and non-SIL relevant safe state requirements . 9
6.5 Implementation and demonstration requirements for verification of SIL compliance .13
Annex A (normative) Techniques and measures to implement, verify, and maintain
SIL compliance .14
Annex B (informative) Applicable escalator and moving walk codes, standards, and laws .17
Annex C (informative) Example of risk reduction decision table .23
Bibliography .24
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. 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. 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.
The committee responsible for this document is ISO/TC 178, Lifts, escalators and moving walks.
ISO 22201 consists of the following parts, under the general title Lifts (elevators), escalators and moving
walks — Programmable electronic systems in safety-related applications:
— Part 2: Escalators and moving walks (PESSRAE)
— Part 3: Life cycle guideline for Programmable Electronic Systems related to PESSRAL and PESSRAE
[Technical Report]
When revised, ISO 22201:2009, Lifts (elevators) — Design and development of programmable electronic
systems in safety-related applications for lifts (PESSRAL), will become Part 1.
iv © ISO 2013 – All rights reserved
Introduction
Systems comprised of electrical and/or electronic components have been used for many years to
perform safety functions in most application sectors. Computer-based systems, generically referred to as
programmable electronic systems (PES), are being used in many application sectors to perform non-safety
functions and, increasingly, to perform safety functions. If computer system technology is to be effectively
and safely exploited, it is essential that those responsible for making decisions have sufficient guidance
on the safety aspects on which to make these decisions. In most situations, safety is achieved by a number
of protective systems that rely on many technologies (for example mechanical, hydraulic, pneumatic,
electrical, electronic, programmable electronic). Any safety strategy must therefore consider not only
all the elements within an individual system (for example sensors, controlling devices and actuators) but
also all the safety-related sub-systems making up the total combination of safety-related systems.
This International Standard is based upon the guidelines provided in the generic International Electro-
technical Commission (IEC) Standard IEC 62061 and Comité Européen de Normalisation (CEN) Standard
EN 115-1:2008.
The requirements given in this International Standard recognize the fact that the product family covers a
total range of passenger and goods/passenger escalators and moving walks used in residential buildings,
offices, hospitals, hotels, industrial plants, etc. This International Standard is the product family standard
for escalators and moving walks and takes precedence over all aspects of the generic standard.
This International Standard sets out the product specific requirements for systems comprised of
programmable electronic components and programmable electronic systems (PES) that are used to perform
safety functions in escalators and moving walks. This International Standard has been developed in order
that consistent technical and performance requirements and rational be specified for Programmable
Electronic System in Safety-Related Application for Escalators and moving walks (PESSRAE).
Risk analysis, terminology, and technical solutions have been considered taking into account the
methods of the IEC 61508 series of standards. The risk analysis of each safety function specified in
Table 1 resulted in the classification of electric safety functions applied to PESSRAE. Tables 1 and 2 give
the safety integrity level and functional requirements, respectively, for each electric safety function.
The safety integrity levels (SIL) specified in this International Standard may also be applied to other
technologies used to satisfy the safety functions specified in this International Standard.
Harmonization with national escalator and moving walk norms:
Application of this International Standard:
The application of this International Standard is intended to be by reference within a national escalator
and moving walk norm such as escalator and moving walk codes, standards, or laws. There are three
reasons for this.
— To allow selective reference by national norms to specific escalator and moving walk safety functions
described in this International Standard. Not all escalator and moving walk safety functions
identified in this International Standard are called out in every national norm.
— To allow for future harmonization of national norms with escalator and moving walk safety
functions identified in this International Standard. Because there exist some differences in the
requirements for fulfilment of the safety objective of national escalator and moving walk norms and
in national practice of escalator and moving walk use and maintenance, there are instances where
the requirements for escalator and moving walk safety functions described in this International
Standard are based on the consensus work and agreement by the ISO committee responsible for this
International Standard. National bodies may choose to selectively harmonize with those escalator
and moving walk safety functions that differ in the requirements called for by the existing national
norm in future norm revisions.
— To allow for the application of this International Standard where escalator and moving walk safety
functions are new or deviate from those specified in this International Standard. More and more,
national escalator and moving walk legislations are moving to performance based requirements.
For this reason the development of new or different escalator and moving walk safety functions
can be foreseen in product specific applications. For those who require escalator and moving walk
safety functions that are new or different from those specified in this International Standard,
this International Standard provides a verifiable method to establish the necessary level of safety
integrity for those functions.
vi © ISO 2013 – All rights reserved
INTERNATIONAL STANDARD ISO 22201-2:2013(E)
Lifts (elevators), escalators and moving walks —
Programmable electronic systems in safety related
applications —
Part 2:
Escalators and moving walks (PESSRAE)
1 Scope
1.1 This International Standard is applicable to the product family of escalators and moving walks used
in residential buildings, offices, hospitals, hotels, industrial plants, etc. This International Standard covers
those aspects that need to be addressed when programmable electronic systems are used to carry out electric
safety functions for escalators and moving walks (PESSRAE). This International Standard is applicable
for escalator and moving walk safety functions that are identified in escalator and moving walk codes,
standards, or laws that reference this International Standard for PESSRAE application. The safety integrity
levels (SILs) specified in this International Standard are understood to be valid for PESSRAE application in
the context of the referenced escalator and moving walk codes, standards, and laws in Annex B.
1.2 This International Standard is also applicable for the application of PESSRAE that are new or deviate
from those described in this International Standard.
1.3 The requirements of this International Standard regarding electrical safety/protective devices
are such that the possibility of a failure of an electric safety/protective device complying with all the
requirements of the standard needs not to be taken into consideration.
In particular, this International Standard:
a) uses safety integrity levels (SIL) for specifying the target failure rate for the safety functions to be
implemented by the PESSRAE;
b) specifies the requirements for achieving safety integrity for a function but does not specify who is
responsible for implementing and maintaining the requirements (for example, designers, suppliers,
owner/operating company, contractor); this responsibility is assigned to different parties according
to safety planning and national regulations;
c) applies to PES used in escalator and moving walk applications that meet the minimum requirements
of a recognized escalator and moving walk standards such as EN 115, ASME A17.1/CSA B44, or
escalator and moving walk laws such as The Japan Building Standard Law Enforcement Order For
Elevator and Escalator;
d) defines the relationship between this International Standard and IEC 61508 and defines the
relationship between this International Standard and the EMC Standard for Escalators and moving
walks on immunity, ISO 22200;
e) outlines the relationship between escalator and moving walk safety functions and their safe-
state conditions;
f) applies to phases and activities that are specific to design of hardware and software but not those
phases and activities which
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