ProSoft Technology PLX81-EIP-61850 - Manual (Page 160)

Glossary of Terms PLX8x-EIP-61850 ♦ Communication Gateway
User Manual Server to
IEC 61850 Client
Page 160 of 167 ProSoft Technology, Inc.
July 2, 2015
State Machine
The functional behavior of any IED, logical node or object, can be defined and
delineated by means of a state machine. This describes, normally by means of a
state diagram, the functionality, responses, actions and reactions, as a series of
discrete, linked states, together with the criteria governing the transition from one
state to another specific state.
Station Level Functions
Functions applying to the whole substation. There are two classes of station-level
functions, i.e. process-related station-level functions and interface-related station-
level functions.
Subdevice
Part of a primary device, for example one phase of a three-phase device.
Subnetwork
Communication system connection between IEDs which have serial
communication facilities. All devices connected to a subnetwork can directly
communicate to each other, without an intervening router. Routers or gateways
can connect subnetworks.
Subscribed Data
Data that a Client has requested to be supplied on a regular basis, or when
trigger condition(s) are satisfied.
Substation Automation System (SAS)
System which operates, protects, and monitors the substation. It includes the
IEDs and communication network infrastructure. It uses fully numerical
technology and serial communication links.
Substation Master
IED that functions either as a RTU or provides a centralized function, for example
time-synchronizing reference.
Supporting Tools
Support the user in the engineering, the operation and the management of the
SAS and its IEDs. The supporting tools can perform the following tasks:
engineering, project management, parameter change, diagnostics, testing,
documentation, and other services.
Usually the supporting tools are part of the SAS and they run on an IED (for
example, PC).