ABB Relion Applications Manual page 80

Section 5
Glossary
74
IRIG-B Inter-Range Instrumentation Group's time code format B
LAN Local area network
LC Connector type for glass fiber cable, IEC 61754-20
LCD Liquid crystal display
LED Light-emitting diode
LHMI Local human-machine interface
MAC Media access control
MCB Miniature circuit breaker
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.
PCM600 Protection and Control IED Manager
PO Power output
PRP Parallel redundancy protocol
REU611 Voltage protection and control relay
RJ-45 Galvanic connector type
RS-485 Serial link according to EIA standard RS485
RSTP Rapid spanning tree protocol
SAN Single attached node
SNTP Simple Network Time Protocol
SO Signal output
WAN Wide area network
WHMI Web human-machine interface
1MRS758335 B
REU611
Application Manual