EN IEC 61987-31:2023

SLOVENSKI STANDARD
01-april-2023
Merjenje in nadzor industrijskega procesa - Strukture podatkov in elementi v
katalogih procesne opreme - 31. del: Seznam lastnosti (LOP) infrastrukturnih
naprav za elektronsko izmenjavo podatkov - Generična struktura (IEC 61987-
31:2022)
Industrial-process measurement and control - Data structures and elements in process
equipment catalogues - Part 31: List of Properties (LOPs) of infrastructure devices for
electronic data exchange - Generic structures (IEC 61987-31:2022)
Industrielle Automatisierungs- und Leittechnik - Datenstrukturen und -elemente in
Katalogen der Prozessleittechnik - Teil 31: Liste der Eigenschaften (LOP) von
Infrastrukturgeräten für den elektronischen Datenaustausch - Allgemeine Strukturen (IEC
61987-31:2022)
Mesure et commande des processus industriels - Structures de données et éléments
dans les catalogues d'équipement de processus - Partie 31: Listes des propriétés (LOP)
d'appareils d'infrastructure pour l'échange électronique de données - Structures
génériques (IEC 61987-31:2022)
Ta slovenski standard je istoveten z: EN IEC 61987-31:2023
ICS:
01.110 Tehnična dokumentacija za Technical product
izdelke documentation
25.040.40 Merjenje in krmiljenje Industrial process
industrijskih postopkov measurement and control
35.240.50 Uporabniške rešitve IT v IT applications in industry
industriji
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD EN IEC 61987-31

NORME EUROPÉENNE
EUROPÄISCHE NORM January 2023
ICS 25.040.40
English Version
Industrial-process measurement and control - Data structures
and elements in process equipment catalogues - Part 31: List of
Properties (LOPs) of infrastructure devices for electronic data
exchange - Generic structures
(IEC 61987-31:2022)
Mesure et commande des processus industriels - Industrielle Automatisierungs- und Leittechnik -
Structures de données et éléments dans les catalogues Datenstrukturen und -elemente in Katalogen der
d'équipement de processus - Partie 31: Listes des Prozessleittechnik - Teil 31: Liste der Eigenschaften (LOP)
propriétés (LOP) d'appareils d'infrastructure pour l'échange von Infrastrukturgeräten für den elektronischen
électronique de données - Structures génériques Datenaustausch - Allgemeine Strukturen
(IEC 61987-31:2022) (IEC 61987-31:2022)
This European Standard was approved by CENELEC on 2023-01-18. 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 CEN-CENELEC
Management Centre 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 CEN-CENELEC Management Centre has the
same status as the official versions.
CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic,
Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the
Netherlands, Norway, Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Türkiye and the United Kingdom.

European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2023 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
Ref. No. EN IEC 61987-31:2023 E

European foreword
The text of document 65E/802/CDV, future edition 1 of IEC 61987-31, prepared by SC 65E "Devices
and integration in enterprise systems" of IEC/TC 65 "Industrial-process measurement, control and
automation" was submitted to the IEC-CENELEC parallel vote and approved by CENELEC as
The following dates are fixed:
• latest date by which the document has to be implemented at national (dop) 2023-10-18
level by publication of an identical national standard or by endorsement
• latest date by which the national standards conflicting with the (dow) 2026-01-18
document have to be withdrawn
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CENELEC shall not be held responsible for identifying any or all such patent rights.
Any feedback and questions on this document should be directed to the users’ national committee. A
complete listing of these bodies can be found on the CENELEC website.
Endorsement notice
The text of the International Standard IEC 61987-31:2022 was approved by CENELEC as a European
Standard without any modification.
In the official version, for Bibliography, the following notes have to be added for the standard indicated:
IEC 62828-1 NOTE Approved as EN IEC 62828-1
IEC 61360-1 NOTE Approved as EN 61360-1
IEC 61360-2 NOTE Approved as EN 61360-2
IEC 61987 (series) NOTE Approved as EN IEC 61987 (series)
Annex ZA
(normative)
Normative references to international publications
with their corresponding European publications
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.
NOTE 1  Where an International Publication has been modified by common modifications, indicated by (mod),
the relevant EN/HD applies.
NOTE 2  Up-to-date information on the latest versions of the European Standards listed in this annex is available
here: www.cenelec.eu.
Publication Year Title EN/HD Year
IEC 60534-1 - Industrial-process control valves - Part 1: EN 60534-1 -
Control valve terminology and general
considerations
IEC 61069-5 - Industrial-process measurement, control and EN 61069-5 -
automation - Evaluation of system properties
for the purpose of system assessment - Part
5: Assessment of system dependability
IEC 61508-6 - Functional safety of EN 61508-6 -
electrical/electronic/programmable electronic
safety-related systems - Part 6: Guidelines
on the application of IEC 61508-2 and
IEC 61508-3
IEC 61987-1 2006 Industrial-process measurement and control - EN 61987-1 2007
Data structures and elements in process
equipment catalogues - Part 1: Measuring
equipment with analogue and digital output
IEC 61987-10 - Industrial-process measurement and control - EN 61987-10 -
Data structures and elements in process
equipment catalogues - Part 10: List of
Properties (LOPs) for Industrial-Process
Measurement and Control for Electronic Data
Exchange - Fundamentals
IEC 61987-11 - Industrial-process measurement and control - EN 61987-11 -
Data structures and elements in process
equipment catalogues - Part 11: List of
properties (LOPs) of measuring equipment
for electronic data exchange - Generic
structures
IEC 61987-31 ®
Edition 1.0 2022-12
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Industrial-process measurement and control – Data structures and elements in

process equipment catalogues –

Part 31: Lists of Properties (LOPs) of infrastructure devices for electronic data

exchange – Generic structures
Mesure et commande des processus industriels – Structures de données et

éléments dans les catalogues d’équipement de processus –

Partie 31: Listes des propriétés (LOP) d’appareils d’infrastructure pour

l’échange électronique de données – Structures génériques

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 25.040.40 ISBN 978-2-8322-6145-3

– 2 – IEC 61987-31:2022 © IEC 2022
CONTENTS
FOREWORD . 4
INTRODUCTION . 6
1 Scope . 7
2 Normative references . 7
3 Terms and definitions . 8
4 General . 8
4.1 Characterization scheme. 8
4.2 OLOP and DLOP . 8
4.3 Cardinality and polymorphism . 9
5 Operating List of Properties (OLOP) . 9
5.1 Generic block structure . 9
5.2 Operating conditions for device design. 10
5.2.1 General . 10
5.2.2 Installation design conditions . 10
5.2.3 Environmental design conditions. 10
5.3 Physical location . 11
5.3.1 General . 11
5.3.2 Available power supply . 11
5.3.3 Process criticality classification . 11
5.3.4 Area classification . 11
6 Device List of Properties (DLOP) . 12
6.1 Basic structure . 12
6.1.1 General . 12
6.1.2 Generic block structure . 12
6.1.3 Relationship to IEC 61987-1 . 13
6.2 Identification . 14
6.3 Application . 14
6.4 Function and system design . 14
6.4.1 General . 14
6.4.2 Dependability . 14
6.5 Input . 14
6.6 Output. 14
6.7 Digital communication . 15
6.7.1 General . 15
6.7.2 Digital communication interface . 15
6.8 Performance . 15
6.8.1 General . 15
6.8.2 Reference conditions for the device . 15
6.8.3 Performance variable . 15
6.9 Rated operating conditions . 16
6.9.1 General . 16
6.9.2 Installation conditions . 16
6.9.3 Environmental design ratings . 16
6.10 Mechanical and electrical construction . 17
6.10.1 General . 17
6.10.2 Overall dimensions and weight . 17

IEC 61987-31:2022 © IEC 2022 – 3 –
6.10.3 Structural design . 17
6.10.4 Explosion protection design approval . 17
6.11 Operability . 17
6.11.1 General . 17
6.11.2 Basic configuration . 17
6.11.3 Parametrization . 17
6.11.4 Operation . 17
6.11.5 Diagnosis . 18
6.12 Power supply . 18
6.13 Certificates and approvals. 18
6.14 Component part identifications . 18
7 Composite devices . 18
8 Additional aspects . 18
Annex A (informative) Device Type Dictionary – Classification of infrastructure devices . 19
Bibliography . 24

Figure 1 – Characterization of infrastructure devices . 8
Figure 2 – Assignment of OLOP and DLOPs for infrastructure devices. 9

Table 1 – Generic block structure of an OLOP . 10
Table 2 – Generic block structure of a DLOP . 13
Table A.1 – Classification scheme for infrastructure devices . 19

– 4 – IEC 61987-31:2022 © IEC 2022
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
INDUSTRIAL-PROCESS MEASUREMENT AND CONTROL – DATA
STRUCTURES AND ELEMENTS IN PROCESS EQUIPMENT CATALOGUES –

Part 31: Lists of Properties (LOPs) of infrastructure devices
for electronic data exchange – Generic structures

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 itself does not provide any attestation of conformity. Independent certification bodies provide conformity
assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any
services carried out by independent certification bodies.
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.
IEC 61987-31 has been prepared by subcommittee 65E: Devices and integration in enterprise
systems, of IEC technical committee 65: Industrial-process measurement, control and
automation. It is an International Standard.
The text of this International Standard is based on the following documents:
Draft Report on voting
65E/802/CDV 65E/895/RVC
Full information on the voting for its approval can be found in the report on voting indicated in
the above table.
The language used for the development of this International Standard is English.

IEC 61987-31:2022 © IEC 2022 – 5 –
This document was drafted in accordance with ISO/IEC Directives, Part 2, and developed in
accordance with ISO/IEC Directives, Part 1 and ISO/IEC Directives, IEC Supplement, available
at www.iec.ch/members_experts/refdocs. The main document types developed by IEC are
described in greater detail at www.iec.ch/standardsdev/publications.
A list of all parts in the IEC 61987 series, published under the general title Industrial-process
measurement and control – data structures and elements in process equipment catalogues, can
be found on the IEC website.
The committee has decided that the contents of this document will remain unchanged until the
stability date indicated on the IEC website under webstore.iec.ch in the data related to the
specific document. At this date, the document will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
– 6 – IEC 61987-31:2022 © IEC 2022
INTRODUCTION
The exchange of product data between companies, business systems, engineering tools, data
systems within companies and, in the future, control systems (electrical, measuring and control
technology) can run smoothly only when both the information to be exchanged and the use of
this information have been clearly defined.
Prior to this standard, requirements on process control devices and systems were specified by
customers in various ways when suppliers or manufacturers were asked to quote for suitable
equipment. The suppliers in their turn described the devices according to their own
documentation schemes, often using different terms, structures and media (paper, databases,
CDs, e-catalogues, etc.). The situation was similar in the planning and development process,
with device information frequently being duplicated in a number of different information
technology (IT) systems.
Any method that is capable of recording all existing information only once during the planning
and ordering process and making it available for further processing, gives all parties involved
an opportunity to concentrate on the essentials. A precondition for this is the standardization of
both the descriptions of the objects and the exchange of information.
The IEC 61987 series proposes a method for standardization which will help both suppliers and
users of process control equipment to optimize workflows both within their own companies and
in their exchanges with other companies. Depending on their role in the process, engineering
firms can be considered here to be either users or suppliers.
The method specifies process control equipment by means of blocks of properties. These blocks
are compiled into lists of properties (LOPs), each of which describes a specific equipment
(device) type. The IEC 61987 series covers both properties that can be used in an inquiry or a
proposal and detailed properties required for integration of the equipment in computer systems
for other tasks.
IEC 61987-10 defines structure elements for constructing lists of properties for electrical and
process control equipment in order to facilitate automatic data exchange between any two
computer systems in any possible workflow, for example engineering, maintenance or
purchasing workflow and to allow both the customers and the suppliers of the equipment to
optimize their processes and workflows. IEC 61987-10 also provides the data model for
assembling the LOPs.
IEC 61987-11 while specifying a generic structure for measuring equipment provides several
important detail descriptions, such as the handling of composite devices, that are also required
for LOPs describing automated industrial valves.
IEC 61987-31 specifies the generic structure for operating (OLOPs) and device lists of
properties (DLOPs) for infrastructure devices. Infrastructure devices are devices installed, for
example, in network equipment and control rooms. It lays down the framework for further parts
of IEC 61987-3x series in which complete LOPs for infrastructure devices of different
construction and functional principle will be specified. The generic structure can also serve as
a basis for the specification of LOPs for other industrial-process control device types.
Annex A contains a characterisation of infrastructure devices. This is a tree of relationships
between different device types. Starting at the root "equipment for industrial-process
automation", it introduces the infrastructure devices. This characterisation is used in the
Process Automation Domain of the IEC Common Data Dictionary (CDD).

IEC 61987-31:2022 © IEC 2022 – 7 –
INDUSTRIAL-PROCESS MEASUREMENT AND CONTROL – DATA
STRUCTURES AND ELEMENTS IN PROCESS EQUIPMENT CATALOGUES –

Part 31: Lists of Properties (LOPs) of infrastructure devices
for electronic data exchange – Generic structures

1 Scope
This part of IEC 61987 provides
• a characterization for the integration of infrastructure devices in the Common Data
Dictionary (CDD);
• generic structures in conformance with IEC 61987-10 for Operating Lists of Properties
(OLOPs) and Device Lists of Properties (DLOPs) of infrastructure devices.
The generic structures for the OLOP and DLOP contain the most important blocks for
infrastructure devices. Blocks pertaining to a specific equipment type will be described in the
corresponding part of the IEC 61987 series. Similarly, equipment properties are not part of this
part of IEC 61987. For instance, the OLOP and DLOP for I/O-modules are to be found in
IEC 61987-32.
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.
IEC 60534-1, Industrial-process control valves – Part 1: Control valve terminology and general
considerations
IEC 61069-5, Industrial-process measurement, control and automation – Evaluation of system
properties for the purpose of system assessment – Part 5: Assessment of system dependability
IEC 61508-6, Functional safety of electrical/electronic/programmable electronic safety-related
systems – Part 6: Guidelines on the application of IEC 61508-2 and IEC 61508-3
IEC 61987-1:2006, Industrial-process measurement and control – Data structures and elements
in process equipment catalogues – Part 1: Measuring equipment with analogue and digital
output
IEC 61987-10, Industrial-process measurement and control – Data structures and elements in
process equipment catalogues – Part 10: List of Properties (LOPs) for Industrial-Process
Measurement and Control for Electronic Data Exchange – Fundamentals
IEC 61987-11, Industrial-process measurement and control – Data structures and elements in
process equipment catalogues – Part 11: List of Properties (LOP) of measuring equipment for
electronic data exchange – Generic structures

– 8 – IEC 61987-31:2022 © IEC 2022
3 Terms and definitions
For the purposes of this document, the terms and definitions given in IEC 61987-10,
IEC 61987‑11 and IEC 60534-1 apply.
ISO and IEC maintain terminological databases for use in standardization at the following
addresses:
• IEC Electropedia: available at https://www.electropedia.org/
• ISO Online browsing platform: available at https://www.iso.org/obp/ui
4 General
4.1 Characterization scheme
IEC 61987-1 describes a general classification scheme for industrial process measuring
equipment based on measured variables. The introduction of the LOPs of any area of
technology into the IEC Common Data Dictionary (CDD) requires the creation of a
characterization scheme for the device types of this technology area.
The area of technology considered in this standard concerns infrastructure devices. The
characterisation of the area for the CDD is provided in Table A.1.
The enhanced characterization scheme is used for the IEC Component Data Dictionary (CDD).
The area of infrastructure devices belongs to the domain of "Process automation" in the CDD.
The area of infrastructure devices is divided into a range of sub-areas. The names of the sub-
areas are shown in Figure 1.
Figure 1 – Characterization of infrastructure devices
4.2 OLOP and DLOP
An Operating List of Properties (OLOP) describes an aspect relating to a device type, for
example, the operational environment of the device, the device design requirements as well as
all the boundary conditions applicable to the point of operation. The structure element "aspect"
is described in IEC 61987-11. Among a range of possible aspects, the operating aspect
represented by the OLOP is the most important.
The Device List of Properties (DLOP) is used to describe a given device type, for example an
I/O-module, a calculator or a controller. The DLOP describes, for example, the mechanical
construction and the electrical construction of a device. Each DLOP describes a particular
device type.
Figure 2 shows the relationship between the OLOP and DLOPs for infrastructure devices. The
OLOP is valid for the generic DLOP as well as for the DLOPs for the various device types, for
example I/O-module, controller, etc.

IEC 61987-31:2022 © IEC 2022 – 9 –

Figure 2 – Assignment of OLOP and DLOPs for infrastructure devices
At higher levels of their construction, OLOPs and DLOPs contain blocks of properties that are
common to all process variables or device types respectively. This part of IEC 61987 specifies
these generic block structures.
Further parts of this standard series specify the block structures and properties of OLOPs and
DLOPs for particular infrastructure device types.
4.3 Cardinality and polymorphism
The principles and the description of the cardinality and polymorphic areas applied in this
document are described in IEC 61987-10 and IEC 61987-11. These structural elements
introduce a high degree of flexibility in the description of a device and its surroundings, provided
the block structure in the LOP is used. They can be briefly described as follows:
• Cardinality allows an LOP element, for example a property block describing a particular
feature of a device, to be repeated as many times as necessary.
• Polymorphism allows the introduction of a complete property block from a selection of
property blocks at a particular structure level of an LOP.
In the case of infrastructure devices, the cardinality can be used for replication of the "Input"
block. For example, an input-module can have two or more different types of input signals.
5 Operating List of Properties (OLOP)
5.1 Generic block structure
An operating list of properties is a list of properties describing the aspect concerning the
operational conditions of the device and additional information regarding the design conditions
under which it will be applied. An OLOP contains no information about the device itself: this is
to be found in the DLOP.
The role of an OLOP is similar to that of an engineering datasheet, in which data describing the
installation environment where the device is to operate are collected. This includes information
on the ambient conditions, the design safety conditions, etc. All of these data are described
with an OLOP.
Due to the nature of infrastructure devices, a single OLOP can be used for more than one
infrastructure device family. The generic block structure of this OLOP shall correspond to that
shown in Table 1. Table 1 corresponds to the generic block structure of an OLOP for measuring
equipment (see IEC 61987-11). Details of the individual blocks are to be found in 5.2 to 5.3.

– 10 – IEC 61987-31:2022 © IEC 2022
Table 1 – Generic block structure of an OLOP
Operating list of properties
Operating conditions for device design
Installation design conditions
Deployment design conditions
Environmental design conditions
Normal environmental design conditions
Limiting environmental design conditions
Physical location
Available power supply
Process criticality classification
Area classification [c]
[c] The block can be repeated as many times as needed using cardinality, which means that a cardinality property
with the name "number of " directly precedes the block (see IEC 61987-10).

5.2 Operating conditions for device design
5.2.1 General
The block operating conditions for device design shall contain properties describing the nominal
conditions to be found at the mounting point. It comprises sub-blocks:
• Installation design conditions
• Environmental design conditions
NOTE The corresponding blocks in the DLOP are described in 5.2.2.
5.2.2 Installation design conditions
5.2.2.1 General
The block installation design conditions shall contain properties that describe the installation
conditions at the mounting point. It comprises the following block:
• Deployment design conditions
5.2.2.2 Deployment design conditions
The block deployment design conditions shall contain properties that describe installation
conditions at the mounting point.
5.2.3 Environmental design conditions
5.2.3.1 General
The block environmental design conditions shall contain properties that describe the
environmental conditions, under which the infrastructure device will be operated. It comprises
the following sub-blocks:
• Normal environmental design conditions
• Limiting environmental design conditions

IEC 61987-31:2022 © IEC 2022 – 11 –
5.2.3.2 Normal environmental design conditions
The block normal environmental design conditions shall contain properties describing the range
of operating conditions for which a device is to be designed. These include, for example, the
ambient temperature or the climate class.
5.2.3.3 Limiting environmental design conditions
The block limiting environmental design conditions shall contain properties describing the
extreme values which influence the infrastructure device. These include for example,
mechanical shock, maximum and minimum rate of ambient temperature change, maximum and
minimum value of storage temperature or vibration.
The infrastructure device shall be able to withstand these extreme values without permanent
impairment of its operating characteristics.
5.3 Physical location
5.3.1 General
The block physical location shall contain properties that describe conditions other than those of
the environment that are in force at the device location. The block contains the following sub-
blocks:
• Available power supply
• Process criticality classification
• Area classification
5.3.2 Available power supply
The block available power supply shall contain properties that describe the available power
supply. It may contain the following sub-blocks:
• Electrical line power supply
• Electrical loop power supply
• Pneumatic/hydraulic supply
The cardinality property "Electrical line power supply" allows more than one source of power to
be described for cases in which there is more than one type available in the plant.
5.3.3 Process criticality classification
The block process criticality classification shall contain properties that describe the criticality
classification for means of assuring plant safety, not including hazardous area classifications,
for example, the safety integrity level.
5.3.4 Area classification
The block area classification shall contain properties that describe the equipment’s internal,
local and remote area classification, including the wiring concept.
The cardinality property "number of area classifications" allows more locations to be described.
The property "Type of area classification" describes the location.

– 12 – IEC 61987-31:2022 © IEC 2022
6 Device List of Properties (DLOP)
6.1 Basic structure
6.1.1 General
As there are large similarities between measuring equipment and infrastructure devices, the
first level structure of the generic Device List of Properties (DLOP) for infrastructure devices
closely adheres to the structure defined in IEC 61987-1. The differences are explained in 6.1.3.
6.1.2 Generic block structure
Table 2 shows the generic block structure of the Device List of Properties (DLOP).
Should a device not offer a particular function, e. g. digital communication, the corresponding
block is not filled out or used in the DLOP structure.
Each block comprises a generic set of properties and where appropriate, additional sub-blocks.
Sub-blocks may be generic for a family of similar devices or particular to a device type. The
sub-blocks may also contain other blocks.
The blocks in the generic structure as shown in Table 2 are described in 6.2 to 6.14. In general,
the individual properties have not been described unless they are of special interest, as all carry
a definition which can be viewed in the Common Data Dictionary.
A description of the blocks below the generic level is to be found in subsequent parts of the
IEC 61987 series.
IEC 61987-31:2022 © IEC 2022 – 13 –
Table 2 – Generic block structure of a DLOP
Device list of properties
Identification
Application
Function and system design
Dependability
Input [c]
Output [c]
Digital communication
Digital communication interface [c]
Performance
Reference conditions for the device
Performance variable [c]
Rated operating conditions
Installation conditions
Deployment conditions
Start-up conditions
Environmental design ratings
Normal environmental conditions
Mechanical and electrical construction
Overall dimensions and weight
Structural design
Explosion protection design approval
Operability
Basic Configuration
Parametrization
Operation
Diagnosis
Power supply
Certificates and approvals
Component part identifications
[c] The block can be repeated as many times as needed using cardinality, which means that a cardinality property
with the name "number of " directly precedes the block (see IEC 61987-10).

6.1.3 Relationship to IEC 61987-1
For the generation of the DLOPs, the structure of a DLOP for measuring equipment in
IEC 61987-1 shall be taken into account with the following amendments:
a) In order to characterize the properties of a digital communication interface, which acts as
both an input and output, a separate block "Digital Communication" has been created.
b) IEC 61987-1:2006, 5.7 "Operating Conditions" has been renamed "Rated Operating
Conditions" to distinguish it from its counterpart in the OLOP of "Operating Conditions for
Device Design".
c) IEC 61987-1:2006, 5.8 "Mechanical Construction" has been renamed "Mechanical and
electrical construction" and has been expanded accordingly.

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d) IEC 61987-1:2006, 5.13 "Documentation" has been placed as a separate aspect.
The DLOP or aspects of it contains other elements not included in IEC 61987-1 which are used
to describe any tests carried out by the manufacturer, the device components, accessories and
documentation delivered with the device.
6.2 Identification
The block identification shall contain the properties necessary for unambiguous identification of
the equipment, for example manufacturer or supplier, product type and designation. Additional
information about the actual equipment supplied, for example serial number and version, may
be added as required.
6.3 Application
The block application shall contain properties describing the designated use of the equipment.
6.4 Function and system design
6.4.1 General
The block function and system design shall contain properties describing system aspects
relevant to the characterization and operation of the equipment.
6.4.2 Dependability
The block dependability shall contain properties describing the dependability of the device in
accordance with IEC 61069-5 and IEC 61508-6, where applicable.
6.5 Input
The block input shall contain properties describing the signal inputs offered by the device.
The number of different inputs offered by the device is to be entered in the cardinality property
"number of inputs" which replicates the input block the corresponding number of times.
For each different input type, a corresponding sub-block or sub-blocks shall be assigned to the
input block.
NOTE 1 Depending on the infrastructure device type, possible input types are to be found in the associated DLOP
in the CDD.
NOTE 2 Digital communication inputs are specified in the digital communication block.
6.6 Output
The block output shall contain properties describing the output signals offered by the device.
The number of different outputs offered by the device is to be entered in the cardinality property
"number of outputs" which replicates the output block the corresponding number of times.
For each different output type a corresponding sub-block or sub-blocks shall be assigned to the
output block.
NOTE 1 Depending on the infrastructure device type, possible output types are to be found in the associated DLOP
in the CDD.
NOTE 2 Digital communication outputs are specified in the digital communication block.

IEC 61987-31:2022 © IEC 2022 – 15 –
6.7 Digital communication
6.7.1 General
The block digital communication shall contain information about the digital communication
interfaces provided by the device.
The number of interfaces offered by the equipment is to be entered in the cardinality property
"number of communication interfaces" which replicates the "Digital communication interface"
block the corresponding number of times.
6.7.2 Digital communication interface
The block digital communication interface shall contain properties that describe the functional,
metrological and electrical aspects of the digital communication interface. The property "type
of communication" determines the communication interface to be described, e.g. HART,
PROFIBUS, FOUNDATION fieldbus etc.
6.8 Performance
6.8.1 General
The block performance shall contain properties that describe performance of infrastructure
devices. The properties shall be compiled into the sub-blocks:
• Reference conditions for the device
• Performance variable
The number of variables for which a perfo
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