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Section 7
Logical node data model
The data model used by IEC 61850 is based on logical nodes containing a set of data
objects. The data model is defined in the standards.
•
IEC 61850-7-4 Compatible logical node classes and data classes
•
IEC 61850-7-3 Common data classes
The standard describes only classes of logical nodes and data objects on one side and
common data classes for the data object attributes. Also here it is given has the elements
in these classes are defined as:
•
Mandatory (M)
•
Optional (O)
•
Conditional optional (Cxxx)
•
In addition, the IEC 61850 states rules for adding vendor-specific definitions to the
standard, in order to cope with extra functionality.
The possible description of the data model according to the standard allows to adapt a
logical node of a LN class to that what the product is supporting or using for this LN. This
definition of what parts of a class is used in the actual product and possible addition is
called a type, according to IEC 61850-6. There are LN types based upon LN classes. The
LN type attributes are called Data Objects (or DATA) and are in of DO types, base upon
respective CDC class. This allows all partners in the IEC 61850 project who need this LN
to understand the LN in all details for the communication part.
The IEC 61850 standard does not describe the functionality and way of operation. Each
supplier has to describe this separately. ABB has described their function blocks that
represent a logical node and all other function blocks in the technical manuals. This
chapter in the communication protocol manual has two purposes:
•
Describe the Logical Node types and their data object attribute types.
•
Make the link to the description of the function block.
7.1
Common data objects in each logical node
The IEC 61850 standard describes in part 7-5, a Common Logical Node. The data objects
contained in that LN are both mandatory and optional. The mandatory data objects have
1MRK 511 281-UUS A
Section 7
Logical node data model
650 series ANSI
47
Communication protocol manual
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