CEI IEC 61346-2-2000 pdf download

CEI IEC 61346-2-2000 pdf download.Industrial systems, installations and equipment and industrial products -Structuring principles and reference designations -Part 2:Classification of objects and codes for classes.
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
It, 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 obiect according to table 1. Ills 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 oblects 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;
EXAMPIE I The desired purpose of an object is Theating. According to table 1 this object is clearly related to class E. It is not of importance, or simply not known at an earty stage of a design process, how the required purpose is realized. This may be done by using a gas or oil burner or an electric heater. In the case of an electric heater, the heat may be produced by an electric resistor. A resistor may, in other cases, be classified by its purpose. restricting a I low”. according to class R. The purpose of the object in the process is, however, to produce heat, so class E. not class R. should be used.
there may be cases where more than one purpose or task is identified. In these cases, a main purpose or task shall be taken into account:
EXAMPLE 2 A flow-rate recorder stores measured values for later use but, at the same time, delivers an output in visible form. II storing is regarded as the main purpose, the object is related to class C of table 1. If the indication of measured values is regarded as the main purpose, the object is related to class P.
— there may be cases where no main purpose or task can be identified. Only in these cases should class A be used;
EXAMPLE 3 A touch screen at a cash dispenser of a bank serves as a means for manual input of information and, at the same time, as a device for indicating information. Both purposes can be regarded as equally valid. Therefore class A may be chosen.
Figure 2 illustrates the principle of assigning classes and relevant letter codes to objects in the case of a measuring circuit. On the left-hand side, the used products are shown. The righthand side illustrates how the products are viewed as objects with an input and an output.
6 Classification of infrastructure objects and associated codes
Each object in a tree-like structure can be classified according to table 1 and be coded with the associated letter codes. However, oblects like industrial complexes consisting of different production facilities, or factories consisting of different production lines and related auxiliary facilities, often have the same purpose or task and therefore belong o a restricted number of classes. In the context of this standard, these types of objects are called infrastructure objects.
NOTE Infrastructur, is to be understood as th, basic structure ot an industrial installation,
In many cases it is recommended to differentiate the constituent objects by means of separate letter codes. Table 2 provides a frame for setting up a classification scheme and associated letter codes for infrastructure objects (see also annex C).
Some facilities that are common to most applications can be identified. These should be assigned letter codes according to classes A and V to Z of table 2.
The classification of the main facilities of the process described is, to a great extent, branch- related and should therefore be treated in branch-related standards, if required. Classes B to U of table 2 are reserved for this purpose. If no branch-related standard exists, classes B to U may be freely chosen and shall then be explained in the documentation.