LCD
Liquid crystal display
LDC
Line drop compensation
LE
Light Edition
LED
Light-emitting diode
LHMI
Local human-machine interface
LOG
Loss of grid
LOM
Loss of mains
MAC
Media access control
MCB
Miniature circuit breaker
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 TCP/IP
Modbus RTU protocol which uses TCP/IP and Ethernet to carry data be-
tween 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 back-
up
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
PGU
Power generating unit
PLC
Programmable logic controller
PPS
Pulse per second
PRP
Parallel redundancy protocol
PTP
Precision Time Protocol
RAM
Random access memory
RCA
Also known as MTA or base angle. Characteristic angle.
RJ-45
Galvanic connector type
Table continues on the next page
Glossary
1MRS757644 H
1222
620 series
Technical Manual