function. One instance of a function is identical to another of
the same kind but has a different number in the IED user
interfaces. The word "instance" is sometimes defined as an
item of information that is representative of a type. In the
same way an instance of a function in the IED is
representative of a type of function.
IP
1. Internet protocol. The network layer for the TCP/IP
protocol suite widely used on Ethernet networks. IP is a
connectionless, best-effort packet-switching protocol. It
provides packet routing, fragmentation and reassembly
through the data link layer.
2. Ingression protection, according to IEC 60529
IP 20
Ingression protection, according to IEC 60529, level 20
IP 40
Ingression protection, according to IEC 60529, level 40
IP 54
Ingression protection, according to IEC 60529, level 54
IRF
Internal failure signal
IRIG-B:
InterRange Instrumentation Group Time code format B,
standard 200
ITU
International Telecommunications Union
LAN
Local area network
LIB 520
High-voltage software module
LCD
Liquid crystal display
LDCM
Line differential communication module
LDD
Local detection device
LED
Light-emitting diode
LNT
LON network tool
LON
Local operating network
MCB
Miniature circuit breaker
MCM
Mezzanine carrier module
MIM
Milli-ampere module
MPM
Main processing module
MVAL
Value of measurement
MVB
Multifunction vehicle bus. Standardized serial bus
originally developed for use in trains.
NCC
National Control Centre
NOF
Number of grid faults
NUM
Numerical module
OCO cycle
Open-close-open cycle
1MRK514019-UEN A
Section 10
Glossary
670 series 2.0 IEC
99
Installation manual
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