IEC 61346-2 pdf download

IEC 61346-2 pdf download Industrial systems, installations and equipment and industrial products – Structuring principles and reference designations – Part 2: Classification of objects and codes for classes
1Scope
This part of lEC 61346 defines object classes and associated letter codes for these classes tobe used in reference designations.
The classification schemes are applicable for objects in all technical areas and may be appliedat any position in a tree-like structure set up in accordance with lEC 61346-1.
NOTE The classification of objects that are of interest from the location aspect only is not considered in thepresent edition of lEC 61346-2.
2Normative references
The following normative documents contain provisions which，through reference in this text,constitute provisions of this part of lEC 61346.For dated references,subsequent amendmentsto，or revisions of，any of these publications do not apply. However，parties to agreementsbased on this part of iEC 61346 are encouraged to investigate the possibility of applying themost recent editions of the normative documents indicated below.For undated references, thelatest edition of the normative document referred to applies. Members of lEC and lSO maintainregisters of currently valid International Standards.
IEC 61346-1:1996,Industrial systems,installations and equipment and industrial products -Structuring principles and reference designations – Part 1: Basic rules
ISO/DIS 14617-6,Graphical symbols for diagrams – Part 6:Measurement and control functions Definitions
For the purposes of this part of lEC 61346, the definitions given in lEC 61346-1 apply.
4 Principe de classification
Le principe de classification des objets est basé sur la vision de chaque objet comme faisant partie d’un processus, avec une entrée et une sortie (voir figure 1 ).
Each object which is part of a process can be characterized by the purpose or the task with respect to its input and output. This implies that it is not important how the object is built up internally. Purpose and task are the main characteristics for establishing a classification scheme in this standard (see also annex B).
5 Classification of objects according to purpose or task and associated letter codes If, irrespective of its position in any tree-like structure, an object interacts or is intended to interact with a flow (for example of electrical energy, information or material), the purpose- or task-related classification scheme and the letter codes presented in table 1 shall be used.
In principle, it is possible to classify any object according to table 1 . It is recommended that this table be used wherever appropriate.
In annex B, figure B.1 shows the classes of table 1 related to a generic process model.
For the classification of objects according to the classification scheme given in table 1 , the following applies:
– the relevant object shall be viewed with regard to how it acts on the flow but without taking into account how this is implemented;