IED Intelligent electronic device
IEEE 1588 v2 Standard for a Precision Clock Synchronization Protocol
for networked measurement and control systems
IP Internet protocol
IP address A set of four numbers between 0 and 255, separated by
periods. Each server connected to the Internet is assigned
a unique IP address that specifies the location for the TCP/
IP protocol.
IRF
1. Internal fault
2. Internal relay fault
IRIG-B Inter-Range Instrumentation Group's time code format B
LAN Local area network
LC Connector type for glass fiber cable
LCD Liquid crystal display
LED Light-emitting diode
LHMI Local human-machine interface
LOG Loss of grid
LOM Loss of mains
LV Low voltage
MAC Media access control
MCB Miniature circuit breaker
MM 1. Multimode
2. Multimode optical fiber
MMS 1. Manufacturing message specification
2. Metering management system
MV Medium voltage
Modbus A serial communication protocol developed by the
Modicon company in 1979. Originally used for
communication in PLCs and RTU devices.
NC Normally closed
OSB Out of step blocking
P2P peer-to-peer
PC 1. Personal computer
2. Polycarbonate
1MAC059074-MB A Section 17
Glossary
615 series ANSI 1183
Technical Manual
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