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Standards Development
This part of the 81346 International Standard, published jointly by IEC and ISO, provides, in
combination with IEC 81346-1 and IEC 81346-2, rules and recommendations on the classification of
properties related to systems designated by reference designations in any area of technical products
and equipment. It provides a classification scheme of properties representing characteristics of objects
and systems being designated by function- product- location- or type-specific reference designations.
The classes of properties are intended, when combined with a reference designation to provide a clear
identification of any property.
RDS 81346-8 Properties are based on fundamental quantities and units in accordance with ISO 80000
standard series and standard data element types in accordance with IEC 61360 standard series (CDD)
where applicable. This NP is coordinated with IEC SC3D (CDD) which supports this NP.
This document will provide a generic set of properties which is fit for purpose in the design phase of
systems and make these properties an important relation to the object occurrence (see IEC 81346 -1,
4.9) as distinct from object individuals (see IEC 81346-1, 4.9).
General
The ISO/IEC 81346 standard series (known as “RDS” for Reference Designation System) provides the
rules and tables for creating a reference model for systems, which is a naming convention for systems
used so anyone (humans, tools, documents etc.) can refer to the same object in an unambiguous
manner from anywhere, across any platform.
The 81346 standard series has during the last years developed to be significant in the aim for
digitalization. The reference designation system enables users to create a “neutral” reference model
for all engineering disciplines, which is referrable to/from other systems (e.g. diagramming, 3D, asset
management tools etc.) without conflicting with them.
It is also clear that the 81346 standard series supports systems engineering as defined in ISO 15288
and system architecture as defined in ISO 42010, because systems and system breakdowns in different
aspects as defined by 81346 is a fundamental part of a system architecture.
The 81346 standard series supports the planning, design, utilization and maintenance of system in a
wide range of industry domains. Advantages of designation systems in combination with properties,
which will be more and more important in the future are:
- The reference designation system can be applied in several technical fields in the same
way and is not designed only for one. Aeronautics, mechanical, electrical and process equipment can
be treated the same way which is a basis for companywide synergy effects.
- The reference designation system allows integrating any kind of systems and components
without changing the once defined designations.
- Properties of any system designated by the reference designation system also becomes
unambiguous and thereby referrable from other sources.
- Properties are regarded as an important part of digitalization of requirements related to
systems and system elements.
- The application of different aspects allows, for instance, the designation of functions
independently from realizing products and their location. Properties (in accordance with this proposal) can be related to any of these aspects.
Rationale
Requirements is an essential part when designing systems, installations and equipment and industrial
products i.e. systems in the scope of the 81346-standard series. As the request to increase
digitalization in the lifecycle of any system is increasing, the need for a common language in this respect
is evident. The 81346 standard series already provide this common language, however requirements
in the form of properties are not supported, yet it is more and more requested.
It is well known that a lot of different initiatives, also outside IEC and ISO, are working to make a useful
solution for requirements and properties in a digital sense, however none of these projects seems to
follow basic rules for establishing classification systems as defined in ISO 22274. Since 2012 the
ISO/IEC 81346 standard series has followed the rules for classification systems defined in ISO 22274,
and the result of this method has been a simple, yet very powerful, classification of systems both
generic and industry specific.
With the knowhow from the work with 81346 made so far, an initial study was carried out in 2020 to test
if it was possible to establish “RDS 81346 Properties” in the same manner as 81346 handles classes
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