IEC PAS 61987-1:2002

IEC/PAS 61987-1
Edition 1.0
2002-08
Industrial-process measurement and control –
Data structures and elements in
process equipment catalogues –

Part 1:
Measuring equipment with analogue
and digital output
PUBLICLY AVAILABLE SPECIFICATION

INTERNATIONAL Reference number
ELECTROTECHNICAL
IEC/PAS 61987-1
COMMISSION
IEC/PAS 61987-1
Edition 1.0
2002-08
Industrial-process measurement and control –
Data structures and elements in
process equipment catalogues –

Part 1:
Measuring equipment with analogue
and digital output
PUBLICLY AVAILABLE SPECIFICATION

INTERNATIONAL Reference number
ELECTROTECHNICAL
IEC/PAS 61987-1
COMMISSION
– 2 – Copyright © 2002, IEC
CONTENTS
FOREWORD.3

INTRODUCTION.4

1 Scope .6

2 Normative references .6

3 Terms and definitions .7

4 Metadocuments .7

4.1 General .7

4.2 Determination of structure and elements .9
5 Metadocument for process measuring equipment .10
Annex A (normative) Classification of terms as a function of measuring equipment .18
Annex B (informative) Classification of terms as a function of measurement principle.20
Annex C (informative) Alphabetical list of terms, definitions and sources.38
Annex D (normative) Document type definitions (DTD) and metadocument of the standard
in SGML notation.44

INTERNATIONAL ELECTROTECHNICAL COMMISSION

___________
INDUSTRIAL-PROCESS MEASUREMENT AND CONTROL –

DATA STRUCTURES AND ELEMENTS IN PROCESS

EQUIPMENT CATALOGUES –
Part 1: Measuring equipment with analogue and digital output

FOREWORD
A PAS is a technical specification not fulfilling the requirements for a standard, but made available to
the public.
IEC-PAS 61987-1 has been prepared by subcommittee 65B: Devices, of IEC technical committee 65:
Industrial-process measurement and control.
The text of this PAS is based on the This PAS was approved for
following document: publication by the P-members of the
committee concerned as indicated in
the following document:
Draft PAS Report on voting
65B/454/PAS 65B/457/RVD
Following publication of this PAS, the technical committee or subcommittee concerned will investigate
the possibility of transforming the PAS into an International Standard.
1) The IEC (International Electrotechnical Commission) is a worldwide organization for standardization comprising
all national electrotechnical committees (IEC National Committees). The object of the 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, the IEC publishes International Standards. 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. The 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 the 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 National Committees.
3) The documents produced have the form of recommendations for international use and are published in the form
of standards, technical specifications, technical reports or guides and they are accepted by the National
Committees in that sense.
4) In order to promote international unification, IEC National Committees undertake to apply IEC International
Standards transparently to the maximum extent possible in their national and regional standards. Any

divergence between the IEC Standard and the corresponding national or regional standard shall be clearly
indicated in the latter.
5) The IEC provides no marking procedure to indicate its approval and cannot be rendered responsible for any
equipment declared to be in conformity with one of its standards.
The text of this PAS is based on a projected standard under development by SC65B/WG10.
Annexes A and D form an integral part of this PAS. Annexes B, C, and E are for information
only.
This PAS shall remain valid for no longer than 3 years starting from 2002-09. The validity may
be extended for a single 3-year period, following which it shall be revised to become another
type of normative document, or shall be withdrawn.

– 4 – Copyright © 2002, IEC
INTRODUCTION
In recent years, industry has become alert to the fact that a great deal of time and effort is

wasted in the transposition of measuring equipment data from one form to another. The

technical data of an instrument, for example, may exist at the manufacturer’s as two separate

data sets for paper and electronic presentation: the end-user requires much the same data for

works standards, engineering data bases or commercial data bases. In most cases, however,

the data cannot be automatically re-used because each application has its own particular data

storage format.
A second problem that belies the re-use of technical data is the content of the data sets and

elements themselves. There is little agreement between manufacturers on what information a
technical data sheet should contain, how it should be structured, or how the results, e.g. of
particular performance tests, should be presented. When transferring this information into a
data base, an end-user will always find gaps and proprietary interpretations that make the
task more difficult.
This document aims to solve these problems by defining data structures, and their content for
industrial process measuring and control equipment. It builds upon the assumption that, for a
given class of measuring equipment, e.g., pressure measuring equipment, temperature
measuring equipment or electromagnetic flow-measuring equipment, a set of non-proprietary
structures and data elements (terms) can be specified.
Part 1 of the document is applicable to electronic catalogues of process measuring equipment
with analogue and digital output. Further parts with similar classification structures will be
produced for measuring equipment with binary output and interface equipment in the future.
(The structure already contains a great many data elements that are common to measuring
equipment with binary output.) Similarly the informative Annex B has been prepared with a
view to future standardisation.
The document is not intended as a replacement for existing standards, but rather as a guiding
document for all future standards which are concerned with the specifications of process
measuring equipment. Every revision of an existing standard should take account of the data
structures and elements defined in Clause 5 of this document or work towards a
harmonisation.
Annex A contains a tabular overview of the classification and catalogue structure of process
measuring equipment. Annex B contains tables with a further sub-classification for specific
measured variables.
Where possible, existing terms from international standards have been used to name the data
elements within the structures. In accordance with ISO 10 241, Annex C of the document

contains an alphabetical list of terms, definitions and sources.
SGML (Standard Generalised Mark-Up Language) to ISO 8879 provides one possible
standardised means of exchanging structured document data free of layout information. To
this end, Annex D contains a Document Type Description and Metadocument of Clause 5 of
the document. Since the drafting of this document, XML, a simplified subset of SGML, has
been developed for Internet applications. As a result it is well supported and provides a viable
alternative to SGML.
The present document conforms with STEP: Standard for the Exchange of Product Model
Data. The data model of the STEP application protocol 212, 221 and 231 (Electrotechnical
Design and Installation; Functional Data and 2D Representation and Process Design: Specs
of Major Equipment) is described in ISO 10 303.212, .221 and .231 respectively and can
reproduce the data field of the DTD as per this document. This includes, e.g. product
structure data, dimensional data, electrical connection data, and product properties such as
measuring range or power supply. The STEP application protocols 212, 221 and 231 define

the objects and their inter-relationships only. Descriptive attributes as described in the

document can be assigned to an object as aggregative property lists.

In defining data elements to fill the proposed data structure for process equipment

catalogues, the present document is also relevant to IEC 61360 (Data Element Type

Definition). It was considered beyond the scope of the document, however, to classify the said

elements according to this scheme, since the main objective lies in the structured

presentation of data. In practice a number of elements have already been defined and appear

in commercial databases structured according to the present document.

– 6 – Copyright © 2002, IEC
INDUSTRIAL-PROCESS MEASUREMENT AND CONTROL −

DATA STRUCTURES AND ELEMENTS IN PROCESS

EQUIPMENT CATALOGUES −
Part 1: Measuring equipment with analogue and digital output

1 Scope
This document defines data structures and elements for industrial process measurement and

control equipment with analogue or digital output. It applies to the production of catalogues of
process measuring equipment supplied by the manufacturer of the product.
The document shall also serve as a reference document for all future standards which are
concerned with process measuring equipment catalogues. In addition, it is intended as a
guide for the production of further standards on process equipment documentation for similar
systems, e.g., for other measuring equipment and actuators.
2 Normative references
This document contains provisions from other publications which are indicated by dated and
undated references. These normative references are cited at the pertinent positions in the text
and the appropriate publications are listed below. In the case of dated references, subsequent
changes to or revisions of these publications belong to this document only if they have been
integrated by changes to or revision of the present document. In the case of undated
references, the latest edition of the cited publication is valid.
ISO 704:2000, Terminology work – Principle and methods
ISO 8879:1986 + A1: 1988, Information Processing – Text and office systems – Standard
Generalized Markup language (SGML)
ISO 10241:1992, Preparation and Presentation of Publications with Terminological
Determinations; Standards
ISO 10303-1:1994, Industrial Automation Systems and Integration – Product Data
Representation and Exchange – Part 1: Overview and fundamental principles
ISO 10303-212, Product Data Representation and Exchange – Part 212: Electrotechnical

design and installation.
ISO 10303-221, Product Data Representation and Exchange – Part 221: Functional data and
2D representation.
ISO 10303-231, Product Data Representation and Exchange – Part 231: Process
design/specs of major equipment.
IEC 60050(351):1998, International Electrotechnical Vocabulary – Chapter 351: Automatic
control
IEC 60068 (all parts), Environmental testing standards
IEC 60529:1989, Degree of Protection provided by Enclosures (IP Code)

IEC 60654 (all parts) Industrial-process measurement and control equipment; Operating

conditions
IEC 60751 (1983), Industrial platinum resistance thermometer sensors

IEC 60770-1:1998, Methods of evaluating the performance of transmitters for use in

industrial-process control systems

IEC 61000 (all parts), Electromagnetic compatibility (EMC)

IEC 61069-5 (all parts), Industrial-process measurement and control - Evaluation of system

properties for the purpose of system assessment
IEC 61082 (all parts), Preparation of documents used in electrotechnology
IEC 61298 Parts 1 to 4, Process measurement and control devices: General methods and
procedures for evaluating performance
IEC 61326-1:2000, Ed. 1.2 Consolidated Edition, Electrical equipment for measurement,
control and laboratory use – EMC requirements – Part 1: General requirements
IEC 61360 (all parts), Standard data element types with associated classification scheme for
electric components
IEC 61508 (all parts): Functional safety of electrical/electronic/programmable electronic
safety-related systems
IEC 82045-1 (2001): Document management – Part 1: Principles and methods
3 Terms and definitions
The nomenclature adopted in the data structure defined in Clause 5 is based on terms and
concepts drawn from international standards. In order to facilitate the use of the document, an
alphabetical list of terms with definitions and normative references is to be found in the
informative Annex C.
Clause 5 also includes so-called search terms. A searc
...