IEC 61346-2:2000

FOREWORD
INTRODUCTION
Clause
1. Scope
2. Normative references
3. Definitions
4. Classification principle
5. Classification of objects according to purpose or task and
   associated letter codes
6. Classification of infrastructure objects and associated
   codes
7. Subclasses
Annex A (informative) Basic requirements for the definition of
        letter codes indicating the type of objects
Annex B (informative) Object-classes related to a generic
        process
Annex C (informative) Object-classes related to objects in a
        generic infrastructure
Annex D (informative) Letter symbols for measured or
        initiating variables
Figure 1 - The basic process concept
Figure 2 - Classification of objects and relevant letter codes
           in a measuring circuit
Figure A.1 - Constituent objects
Figure B.1 - Object-classes related to a process
Figure C.1 - Object-classes related to objects in a generic
             infrastructure
Table 1 - Classes of objects according to their purpose or task
          and associated letter codes
Table 2 - Classes of infrastructure objects
Table 3 - Examples for some possible branch-related
          applications of classes B to U in table 2
Table D.1 - Letter symbols for measured or initiating
            variables as given in ISO/DIS 14617-6

Defines object classes and associated letter codes for these classes to be used in reference designations. Applicable in all technical areas and may be applied at any position in a tree-like structure set up in accordance with IEC 61346-1