ProSoft Technology PLX8X-MNET-61850 - Manual (Page 210)

Glossary of Terms PLX8x-MNET-61850 ♦ Communication Gateway
User Manual Modbus TCP/IP to IEC 61850
Page 210 of 228 ProSoft Technology, Inc.
May 14, 2014
G
Gateway
Network interconnection device that supports the full stack of the relevant
protocol which it can convert to a non-7-layer protocol for asynchronous
transmission over wide area networks.
Generic Object Oriented Substation Event
A report by exception multicast sent by an IED in response to a change of state
in the system. It is high-speed binary object, typically containing the double
command state of each of its status inputs, starters, output elements and relays,
actual and virtual. A GOOSE report enables high speed trip signals to be issued
with a high probability of delivery.
Generic Substation Event Model
Defines two classes of multicast/broadcast data, i.e. GOOSE and GSSE, for the
fast transfer of input and output data values between IEDs.
Generic Substation State Event
Similar to GOOSE but restricts the contained-data to data values of a number of
double-command (bit pairs) status values, for example: open, closed, in
transition, or invalid states.
H
Hold Point
Point, defined in the appropriate document, beyond which an activity must not
proceed without the written approval of the initiator of the conformance test. The
test facility must provide a written notice to the initiator at an agreed time prior to
the hold point. The initiator, or his representative, is obligated to verify the hold
point and approve the resumption of the testing.
Hub
A central device that connects multiple computers on a single network. Each port
of a hub links individual media segments together to create a larger network that
operates as a single LAN. Collisions in the network are possible.
Human Machine Interface (HMI)
Display screen, either part of an IED or as a stand-alone device, presenting
relevant process data to a human operator, with which the operator interacts. An
HMI will typically present windows, icons, menus, pointers, and may include a
keypad to enable user access and interaction.