SIST EN 60027-6:2008

SLOVENSKI STANDARD
SIST EN 60027-6:2008
01-januar-2008
ýUNRYQLVLPEROL]DXSRUDERYHOHNWURWHKQRORJLMLGHO.UPLOQDWHKQRORJLMD,(&

Letter symbols to be used in elecrical technology - Part 6: Control technology (IEC 60027
-6:2006)
Formelzeichen für die Elektrotechnik - Teil 6: Steuerungs- und Regelungstechnik (IEC
60027-6:2006)
Symboles littéraux a utiliser en électrotechnique - Partie 6: Technologie de commande et
de régulation (IEC 60027-6:2006)
Ta slovenski standard je istoveten z: EN 60027-6:2007
ICS:
01.060 9HOLþLQHLQHQRWH Quantities and units
01.075 Simboli za znake Character symbols
29.020 Elektrotehnika na splošno Electrical engineering in
general
SIST EN 60027-6:2008 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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EUROPEAN STANDARD
EN 60027-6

NORME EUROPÉENNE
October 2007
EUROPÄISCHE NORM

ICS 01.060 Partially supersedes HD 60027-2:2003


English version


Letter symbols to be used in electrical technology -
Part 6: Control technology
(IEC 60027-6:2006)


Symboles littéraux  Formelzeichen für die Elektrotechnik -
à utiliser en électrotechnique - Teil 6: Steuerungs- und Regelungstechnik
Partie 6: Technologie de commande (IEC 60027-6:2006)
et de régulation
(CEI 60027-6:2006)




This European Standard was approved by CENELEC on 2007-10-01. CENELEC 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.

Up-to-date lists and bibliographical references concerning such national standards may be obtained on
application to the Central Secretariat or to any CENELEC member.

This European Standard exists in three official versions (English, French, German). A version in any other
language made by translation under the responsibility of a CENELEC member into its own language and notified
to the Central Secretariat has the same status as the official versions.

CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Cyprus, the
Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,
Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain,
Sweden, Switzerland and the United Kingdom.

CENELEC
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung

Central Secretariat: rue de Stassart 35, B - 1050 Brussels


© 2007 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.
Ref. No. EN 60027-6:2007 E

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EN 60027-6:2007 - 2 -
Foreword
The text of document 25/331/FDIS, future edition 1 of IEC 60027-6, prepared by IEC TC 25, Quantities
and units, and their letter symbols, in co-operation with the International Federation of Automatic Control
(IFAC), was submitted to the IEC-CENELEC parallel vote and was approved by CENELEC as
EN 60027-6 on 2007-10-01.
This European Standard supersedes Clause 11 of HD 60027-2:2003.
In comparison with Clause 11 of HD 60027-2:2003 the following has been altered:
– the number of physical quantities and of their symbols listed in this European Standard has been
increased significantly. New clauses for general quantities, for general functions, for characteristic
quantities of the step response, for mapping functions and their quantities, and for parameters of
transfer elements and control loops have been included;
– the hitherto existing series of reserve symbols for variable quantities of the control loop has been
deleted. Four symbols out of this series have been used as new symbols for main quantities;
– the presentation of the denotation of some mathematical concepts specific to the field formerly given
in 11.4 has been removed to the column “remarks” of the relevant tables.
The following dates were fixed:

– latest date by which the EN has to be implemented

at national level by publication of an identical
(dop) 2008-07-01
national standard or by endorsement

– latest date by which the national standards conflicting
(dow) 2010-10-01
with the EN have to be withdrawn
Annex ZA has been added by CENELEC.
__________
Endorsement notice
The text of the International Standard IEC 60027-6:2006 was approved by CENELEC as a European
Standard without any modification.
__________

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- 3 - EN 60027-6:2007

Annex ZA
(normative)

Normative references to international publications
with their corresponding European publications

The following referenced documents are indispensable for the application 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.

NOTE  When an international publication has been modified by common modifications, indicated by (mod), the relevant EN/HD
applies.

Publication Year Title EN/HD Year
1)
IEC 60027-1 1992 Letter symbols to be used in electrical EN 60027-1 2006
technology -
Part 1: General


IEC 60027-2 2005 Letter symbols to be used in electrical EN 60027-2 2007
technology -
Part 2: Telecommunications and electronics


IEC 60050-101 1998 International Electrotechnical Vocabulary – –
(IEV) -
Part 101: Mathematics


IEC 60050-351 2006 International Electrotechnical Vocabulary – –
(IEV) -
Part 351: Control technology


ISO 80000-3 2006 Quantities and units - – –
Part 3: Space and time


ISO 31-5 1992 Quantities and units - – –
Part 5: Electricity and magnetism


ISO 31-11 1992 Quantities and units - – –
Part 11: Mathematical signs and symbols for
use in the physical sciences and technology


ANSI/IEEE 280 1985 Letter Symbols for Quantities Used in – –
Electrical Science and Electrical Engineering




1)
EN 60027-1 is based on IEC 60027-1:1995 (Reprint) + A1:1997.

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NORME CEI
INTERNATIONALE
IEC



60027-6
INTERNATIONAL


Première édition
STANDARD

First edition

2006-12


Symboles littéraux à utiliser en électrotechnique –
Partie 6:
Technologie de commande et de régulation

Letter symbols to be used in
electrical technology –
Part 6:
Control technology
© IEC 2006 Droits de reproduction réservés ⎯ Copyright - all rights reserved
Aucune partie de cette publication ne peut être reproduite ni No part of this publication may be reproduced or utilized in any
utilisée sous quelque forme que ce soit et par aucun procédé, form or by any means, electronic or mechanical, including
électronique ou mécanique, y compris la photocopie et les photocopying and microfilm, without permission in writing from
microfilms, sans l'accord écrit de l'éditeur. the publisher.
International Electrotechnical Commission, 3, rue de Varembé, PO Box 131, CH-1211 Geneva 20, Switzerland
Telephone: +41 22 919 02 11 Telefax: +41 22 919 03 00 E-mail: inmail@iec.ch Web: www.iec.ch
CODE PRIX
N
PRICE CODE
Commission Electrotechnique Internationale
International Electrotechnical Commission
МеждународнаяЭлектротехническаяКомиссия
Pour prix, voir catalogue en vigueur
For price, see current catalogue

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60027-6 © IEC:2006 – 3 –
CONTENTS
FOREWORD.5

1 Scope.9
2 Normative references .9
3 Principles .9
4 General quantities .11
5 General functions .15
6 Characteristic quantities of the step response .17
7 Mapping functions and their variable quantities .19
8 Parameters of transfer elements and control loops .21
9 Variable quantities of the control loop (open-loop control system and closed-loop
control system).25

Annex A (informative) Functional diagrams .27

Figure A.1 – Open-loop control system; guidance system .27
Figure A.2 – Closed-loop control system; feedback control system .27
Figure A.3 – System description using state variables .29

Table 1 – General quantities .11
Table 2 – General functions .15
Table 3 – Characteristic quantities of the step response .17
Table 4 – Mapping functions and their variable quantities .19
Table 5 – Parameters of transfer elements and control loops .21
Table 6 – Variable quantities of the control loop.25

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60027-6 © IEC:2006 – 5 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
LETTER SYMBOLS TO BE USED IN ELECTRICAL TECHNOLOGY –

Part 6: Control technology


FOREWORD
1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
all national electrotechnical committees (IEC National Committees). The object of IEC is to promote
international co-operation on all questions concerning standardization in the electrical and electronic fields. To
this end and in addition to other activities, IEC publishes International Standards, Technical Specifications,
Technical Reports, Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC
Publication(s)”). Their preparation is entrusted to technical committees; any IEC National Committee interested
in the subject dealt with may participate in this preparatory work. International, governmental and non-
governmental organizations liaising with the IEC also participate in this preparation. IEC collaborates closely
with the International Organization for Standardization (ISO) in accordance with conditions determined by
agreement between the two organizations.
2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international
consensus of opinion on the relevant subjects since each technical committee has representation from all
interested IEC National Committees.
3) IEC Publications have the form of recommendations for international use and are accepted by IEC National
Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC
Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any
misinterpretation by any end user.
4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications
transparently to the maximum extent possible in their national and regional publications. Any divergence
between any IEC Publication and the corresponding national or regional publication shall be clearly indicated in
the latter.
5) IEC provides no marking procedure to indicate its approval and cannot be rendered responsible for any
equipment declared to be in conformity with an IEC Publication.
6) All users should ensure that they have the latest edition of this publication.
7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and
members of its technical committees and IEC National Committees for any personal injury, property damage or
other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and
expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC
Publications.
8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
indispensable for the correct application of this publication.
9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of
patent rights. IEC shall not be held responsible for identifying any or all such patent rights.
International Standard IEC 60027-6 has been prepared by IEC technical committee 25:
Quantities and units, and their letter symbols, in co-operation with the International Federation
of Automatic Control (IFAC).
This standard cancels and replaces IEC/PAS 60027-6 published in 2004. This first edition
constitutes a technical revision.
The text of this standard is based on the following documents:
FDIS Report on voting
25/331/FDIS 25/341/RVD

Full information on the voting for the approval of this standard can be found in the report on
voting indicated in the above table.
This part of IEC 60027 is intended to replace Clause 11 of IEC 60027-2:2000.

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60027-6 © IEC:2006 – 7 –
In comparison with Clause 11 of IEC 60027-2:2000 the following has been altered:
– the number of physical quantities and of their symbols listed in this International Standard
has been increased significantly. New clauses for general quantities, for general functions,
for characteristic quantities of the step response, for mapping functions and their
quantities, and for parameters of transfer elements and control loops have been included;
– the hitherto existing series of reserve symbols for variable quantities of the control loop
has been deleted. Four symbols out of this series have been used as new symbols for
main quantities;
– the presentation of the denotation of some mathematical concepts specific to the field
formerly given in 11.4 has been removed to the column “remarks” of the relevant tables.
This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.
The committee has decided that the contents of this publication will remain unchanged until
the maintenance result date indicated on the IEC web site under "http://webstore.iec.ch" in
the data related to the specific publication. At this date, the publication will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.

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60027-6 © IEC:2006 – 9 –
LETTER SYMBOLS TO BE USED IN ELECTRICAL TECHNOLOGY –

Part 6: Control technology


1 Scope
This part of IEC 60027 is applicable to control technology. It gives names and symbols for
quantities, signals and functions, and their units.
2 Normative references
The following referenced documents are necessary for the application 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.
lEC 60027-1:1992, Letter symbols to be used in electrical technology – Part 1: General
IEC 60027-2:2005, Letter symbols to be used in electrical technology – Part 2:
Telecommunications and electronics
IEC 60050-101:1998, International Electrotechnical Vocabulary – Part 101: Mathematics
IEC 60050-351:2006, International Electrotechnical Vocabulary – Part 3
...