LCD
Liquid crystal display
LED
Light-emitting diode
LHMI
Local human-machine interface
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
NO
Normally open
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 picking up on two conditions: the peak-
to-peak value is above the set pickup current or the peak
value is above two times the set pickup value
PLC
Programmable logic controller
PPS
Pulse per second
RAM
Random access memory
RCA
Also known as MTA or base angle. Characteristic angle.
REF615R
Wire-alike replacement option for DPU2000R with the
same form factor
RJ-45
Galvanic connector type
RMS
Root-mean-square (value)
ROM
Read-only memory
RSTP
Rapid spanning tree protocol
RTC
Real-time clock
1MRS240050-IB C
Section 18
Glossary
REF615R
655
Technical Manual
Summary of Contents for RELION REF615R
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