Prosoft-technology PLX8X-MNET-61850 Instrukcja Użytkownika Pobierz pdf (Strona 216)

Glossary of Terms PLX8x-MNET-61850 ♦ Communication Gateway

User Manual Modbus TCP/IP to IEC 61850

Page 216 of 228 ProSoft Technology, Inc.

May 14, 2014

Physical System

A system composed of the IEDs and the interconnecting physical communication

network (commonly fiber optics). The boundary of a system is given by its logical

or physical interfaces. Examples are industrial systems, management systems,

information systems, etc.

Piece of Information for Communication (PICOM)

PICOM is a description of an information transfer on a given logical connection

with given communication attributes between two logical nodes. It also contains

the information to be transmitted and required attributes, for example,

performance. It does not represent the actual structure or format of the data that

is transmitted over the communication network. The PICOM approach was

adopted from the CIGRE working group 34.03.

Point to Point

One-to-one communication link between two nodes, used only for

communication between those two nodes.

Positive Test

Test to ensure the correct implementation of the system capabilities as defined

by the supplier. A positive test has a described and defined response.

Presentation Layer

Layer 6 of the OSI reference model for Open Systems Interconnection. It

provides an interface between the concrete local syntax used by the Application

layer and the negotiated abstract and transfer syntaxes to be used for the

transfer of data during a communication session between the two communicating

application entities.

Primary System

Common term for all power system equipment and switchgear.

Process Level Functions

All functions interfacing to the process, i.e. binary and analog input/output

functions, for example: data acquisition (including sampling) and the issuing of

commands. These functions communicate via the logical interfaces 4 and 5 to

the bay level.

Process Related Station Level Functions

Functions that use data from more than one bay, or from the whole substation,

and act on the primary equipment of more than one bay, or on the primary

equipment of the whole substation. Examples of such functions are: station-wide

interlocking, automatic sequencers, and busbar protection. These functions

communicate mainly via the logical interface 8.

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Prosoft-technology PLX8X-MNET-61850 Instrukcja Użytkownika Strona 216