ProSoft Technology PLX8X-MNET-61850 - Manual (Page 215)

PLX8x-MNET-61850 ♦ Communication Gateway Glossary of Terms
Modbus TCP/IP to IEC 61850 User Manual
ProSoft Technology, Inc. Page 215 of 228
May 14, 2014
O
Object Attribute
Field or a category or value of data that, together with other attributes, specify the
services or data values related to the function and performance of an object.
Object Name
Unique full reference identifier of a specific data object that is unique within the
SAS domain, or within a specific domain. It is constructed by concatenation,
using dot '.' deliminators, to as many hierarchical levels as required, for example,
'BasicDataClass.StructuredComponent.X.X.X.X.etc'
Object/Instance
Descriptor of an instance of a class of entity that is uniquely identifiable within the
SAS domain, with defined boundaries and identity which encapsulates states and
behavior. States are represented by attributes, behavior by services and state
machines.
Open Protocol
Protocol whose stack is either standardized or publicly available.
P
Parameters
Variables which define the behavior of functions of the SAS and its IEDs within a
given range of values.
Physical Connection
Communication link between physical devices.
Physical Device
Entity that represents the physical parts of a device (hardware and operating
system, etc.). Physical devices host logical devices. Equivalent to an Intelligent
Electronic Device (IED) as used in the context of the IEC-61850 Standard.
Physical Layer
Layer 1 of the OSI reference model for Open Systems Interconnection. It
provides the mechanical, electrical, functional and procedural means to activate,
maintain and de-activate physical connections for bit transmission between data-
link entities. Physical layer entities are interconnected by means of a physical
medium.
Physical Node
Point of connection on a physical device to a communication network. A physical
node is a multi-functional unit providing both the communication server and the
mapping to the real substation IED.