Section 7 Logical Node Data Model; Common Data Objects In Each Logical Node - ABB Relion 630 Series Communication Protocol Manual

1MRS756793 E
Section 7
7.1
630 series
Communication Protocol Manual
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. The elements in these classes have
certain definitions.
• Mandatory (M)
• Optional (O)
• Conditional optional (Cxxx)
• In addition, 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 tasks:
• Describe the Logical Node types and their data object attribute types.
• Make the link to the description of the function block.

Common data objects in each logical node

The IEC 61850 standard describes in part 7-4, a Common Logical Node. The data
objects contained in that LN are both mandatory and optional. The mandatory data
objects have to be included in each LN. This clause describes the general handling of
the data objects within the 630 series products.
Section 7
Logical node data model
37