1MRS755312
REF 541/543/545
REM 543/545
RET 541/543/545
21
Connectivity Packages
User’s Guide
5.
Logical node naming
The connectivity packages contain the descriptions for logical nodes and function
blocks of IEDs. When an IED configuration (SCL file or CAP project file) is
imported to the connectivity package object, a structure containing definitions of
logical nodes is constructed.
When the IED configuration is imported, for example, to the Communication
Engineering Tool (CET), you can see the logical devices (LD) and logical nodes
(LN). An IED object can include many logical devices, and a logical device can
include many logical nodes.
The logical node names are constructed from three different parts: LN prefix, LN
class and LN instance number. LN prefix is an ABB specific string with less than
five characters (see the table below). The LN class is the name of the logical node
class defined in the IEC 61850-7-4 specification, refer to the Section 1.8. Related
documents. The LN instance number is the ID number of logical node. In the
REF 541/543/545, REM 543/545 and RET 541/543/545 connectivity packages, the
LN instance number is the SPA channel number of the corresponding function
block.
The figure below shows a designation code for the logical nodes in connectivity
packages. In the following example, the logical node name is DEFPTOC41.
A050046
Fig. 5.-1 Logical node naming in connectivity packages
DEF
PTOC 41
prefix for directional earth fault protection function
IEC 61850 name for time overcurrent protection LN
SPA channel number of DEF2HIGH function block
