Section 7 Logical Node Data Model; Common Data Objects In Each Logical Node - ABB SAM600-IO Protocol Manual

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Section 7
7.1
Switchgear control unit SAM600-IO Version 2.2 IEC
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. 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.

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 to be included in each LN. This clause describes the general handling
of the data objects in the IEDs.
Section 7
Logical node data model
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