ABB 650 series ANSI Engineering Manual page 124

Section 10
Glossary
118
IEEE Institute of Electrical and Electronics Engineers
IEEE 802.12 A network technology standard that provides 100 Mbits/s on
twisted-pair or optical fiber cable
IEEE P1386.1 PCI Mezzanine Card (PMC) standard for local bus modules.
References the CMC (IEEE P1386, also known as Common
Mezzanine Card) standard for the mechanics and the PCI
specifications from the PCI SIG (Special Interest Group) for the
electrical EMF (Electromotive force).
IED Intelligent electronic device
I-GIS Intelligent gas-insulated switchgear
Instance When several occurrences of the same function are available in
the IED, they are referred to as instances of that 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 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
1MRK 511 245-UUS -
650 series ANSI
Engineering Manual