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, IEC 61754-20
LCD Liquid crystal display
LE Light Edition
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.
MV Medium voltage
NC Normally closed
P2P peer-to-peer
PC 1. Personal computer
2. Polycarbonate
PCM600 Protection and Control IED Manager
Peak-to-peak 1. The amplitude of a waveform between its maximum
positive value and its maximum negative value
2. A measurement principle where the measurement
quantity is made by calculating the average from the
positive and negative peak values without including the
DC component. The peak-to-peak mode allows
considerable CT saturation without impairing the
performance of the operation.
Peak-to-peak with
peak backup
A measurement principle similar to the peak-to-peak
mode but with the function starting on two conditions:
the peak-to-peak value is above the set start current or
the peak value is above two times the set start value
PLC
Programmable logic controller
PPS Pulse per second
PRP Parallel redundancy protocol
1MRS758755 A Section 17
Glossary
REC615 and RER615 795
Technical Manual
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