ProSoft Technology PLX81-EIP-61850 - Manual (Page 153)

PLX8x-EIP-61850 ♦ Communication Gateway Glossary of Terms
Server to
IEC 61850 Client User Manual
ProSoft Technology, Inc. Page 153 of 167
July 2, 2015
Logical Device
Entity that represents a set of typical substation functions.
Logical Device Class
Virtual device that exists to enable aggregation of related logical nodes and
dataset(s) for communication purposes. In addition, logical devices contain
convenient lists of frequently accessed, or referred to, information, for example:
data sets.
Logical Device Object
Instance of the logical device class.
Logical Node
Smallest component of a function that exchanges data. A logical node is an
object defined by its data and methods.
Logical Node Class
Aggregation of data, data sets, report controls, log controls, logs, GOOSE and
GSSE controls and sampled measured values. Logical node classes represent
typical functions of the substation system. IEC 61850-7-4 defines a list of
compatible logical node classes for protection functions, supervisory control,
metering, switchgear, power transformers, etc.
Logical Node Data
Information contained within a logical node. The term encompasses ACSI data,
control blocks, etc.
Logical Node Object
Instance of a logical node class.
Logical System
Set of all application functions performing some overall task and communicating
via its logical nodes, for example, 'management of a substation.' The boundary of
a system is given by its logical or physical interfaces. Examples are industrial
systems, management systems, information systems, etc.
M
Mapping
Defined association or linkage of two separate entities or sets of values by
means of assigned correlation of individual elements from the first set to
individual elements of the second set.
Merging unit
Physical unit performing the time-coherent combination of the current and/or
voltage data coming from the secondary converters. The merging unit can be
part of one of the transducers in the field or may be a separate unit, for example
in the control room.