ABB rec670 - Page 213

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
OCP Overcurrent protection
OEM Optical Ethernet module
1MRK 511 360-UEN A Section 13
Glossary
Bay control REC670 2.1 IEC 207
Commissioning manual