IED Intelligent electronic deviceIET600 Integrated engineering toolI-GIS Intelligent gas-insulated switchgearIOM Binary input/output moduleInstance When several occurrences of the same function areavailable in the IED, they are referred to as instances ofthat function. One instance of a function is identical toanother of the same kind but has a different number in theIED user interfaces. The word "instance" is sometimesdefined as an item of information that is representative ofa type. In the same way an instance of a function in theIED is representative of a type of function.IP 1. Internet protocol. The network layer for the TCP/IPprotocol suite widely used on Ethernet networks. IP is aconnectionless, best-effort packet-switching protocol. Itprovides packet routing, fragmentation and reassemblythrough the data link layer.2. Ingression protection, according to IEC 60529IP 20 Ingression protection, according to IEC 60529, level 20IP 40 Ingression protection, according to IEC 60529, level 40IP 54 Ingression protection, according to IEC 60529, level 54IRF Internal failure signalIRIG-B: InterRange Instrumentation Group Time code format B,standard 200ITU International Telecommunications UnionLAN Local area networkLIB 520 High-voltage software moduleLCD Liquid crystal displayLDCM Line data communication moduleLDD Local detection deviceLED Light-emitting diodeLNT LON network toolLON Local operating networkMCB Miniature circuit breakerMCM Mezzanine carrier moduleMIM Milli-ampere moduleMPM Main processing moduleMVAL Value of measurement1MRK 511 394-UEN A Section 6Glossary670 series 2.2 IEC 67Communication protocol manual