ProSoft Technology PLX8X-MNET-61850 - Manual (Page 214)

Glossary of Terms PLX8x-MNET-61850 ♦ Communication Gateway
User Manual Modbus TCP/IP to IEC 61850
Page 214 of 228 ProSoft Technology, Inc.
May 14, 2014
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.
Message
Inherent attribute of a communication between IEDs, functions or instances, that
conveys service-specific data or commands, on receipt of which it is expected
that action will be taken.
Model
A simplified representation of some aspects of reality. The purpose of creating a
model is to facilitate understanding, description, or prediction of something that is
difficult or impossible to directly observe in the real world, by providing the
opportunity for exploration of a simplified representation of a particular entity or
phenomenon.
Model Implementation Conformance Statement
Details the standard data object models supported by the system or device.
Multicast
Uni-directional, connectionless communication between a server and a selected
set of Clients.
N
Name Plate
Name for the set of data typically found on an item of a plant (for example, a
power transformer) or on an IED (for example, a protection relay) that uniquely
describes that device's identity and attributes.
Negative Test
Test to verify the correct response of a device or system to the following
standards:
 IEC-61850-conformant information and services which are not implemented
in the device or system under test
 Non-IEC-61850-conformant information and services sent to the device or
system under test
Network Layer
Layer 3 of the OSI reference model for Open Systems Interconnection. It
provides functional and procedural means of connectionless or connection-mode
transmission, also independence from routing and communications-relaying
considerations, enabling the transparent transfer of data between transport
entities.