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 with-
out including the DC component. The peak-to-peak mode allows consid-
erable 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
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
RMS Root-mean-square (value)
RoHS Restriction of hazardous substances
ROM Read-only memory
RSTP Rapid spanning tree protocol
RTC Real-time clock
RTD Resistance temperature detector
RTS Ready to send
SAN Single attached node
SBO Select-before-operate
SCADA Supervision, control and data acquisition
SCL XML-based substation description configuration language defined by IEC
61850
Single-line dia-
gram
Simplified notation for representing a three-phase power system. Instead
of representing each of three phases with a separate line or terminal, only
one conductor is represented.
SMT Signal Matrix tool in PCM600
Table continues on the next page
1MRS758755 C Glossary
REC615 & RER615
Technical Manual
867
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