ABB Relion 670 series, Technical Reference Manual, Page: 1225 / 1232

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 standard
IP 20 Ingression protection, according to IEC standard, level
IP20- Protected against solidforeign objects of12.5mm
diameter andgreater.
IP 40 Ingression protection, according to IEC standard, level IP40-
Protected against solid foreign objects of 1mm diameter and
greater.
IP 54 Ingression protection, according to IEC standard, level
IP54-Dust-protected,protected againstsplashing water.
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
1MRK505222-UUS C
Section 23
Glossary
1219
Technical reference manual