IEC 61850-9-2 LE Lite Edition of IEC 61850-9-2 offering process bus interface
IED Intelligent electronic device
IEEE 1588 Standard for a Precision Clock Synchronization Protocol for networked
measurement and control systems
IRF
1. Internal fault
2. Internal relay fault
IRIG-B Inter-Range Instrumentation Group's time code format B
L/R Local/Remote
LAN Local area network
LC Connector type for glass fiber cable, IEC 61754-20
LD Logical device
LDC Line drop compensation
LE Light edition
LED Light-emitting diode
LF Low frequency
LHMI Local human machine interface
LN Logical node (IEC61850)
LOG Loss of grid
LOM Loss of mains
LV Low voltage
M/F Master/Follower
MAC Media access control
MCB Miniature circuit breaker
MCC Minimizing circulating current
MM
1. Multimode
2. Multimode optical fiber
MMS
1. Manufacturing message specification
2. Metering management system
Modbus A serial communication protocol developed by the Modicon company in
1979. Originally used for communication in PLCs and RTU devices.
Modbus ASCII Link mode using 7-bit ASCII characters
Modbus RTU Link mode using 8-bit binary characters
MSB Most significant bit
MV Medium voltage
NC Normally closed
NPS Negative phase sequence
NRP Negative reactance principle
NSCB Non-source circuit breaker
OSB Out of step blocking
Glossary 1MRS759142 F
1956 REX640
Technical Manual
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