ProSoft Technology PLX8X-MNET-61850 - Manual (Page 223)

PLX8x-MNET-61850 ♦ Communication Gateway Glossary of Terms
Modbus TCP/IP to IEC 61850 User Manual
ProSoft Technology, Inc. Page 223 of 228
May 14, 2014
U
Unicast/Point to Point
Communication between a server and a single Client.
Unified Modeling Language
Standardized constructs and semantics for diagrams, including state machines,
which are used to describe/specify the functionality of an IED, object model or a
process.
Unsolicited Data or Unsolicited Message
Data or message which is supplied to a Client from a server without the Client
subscribing to that data or message, for example: reset, abort, time. Does not
require a connection to be established.
Utility Communications Architecture
Describes the concepts of standardized models for power system objects.
W
Witness Point
Point, defined in the appropriate document, at which an inspection will take place
on an activity. The activity may proceed without the 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 witness point. The initiator or his representative has
the right, but is not obligated, to verify the witness point.