Section 5 Glossary
620 series Series of numerical protection and control relays for high-
end protection and supervision applications of utility
substations, and industrial switchgear and equipment
ACD Start/pickup status
ACT 1. Application Configuration tool in PCM600
2. Trip status in IEC 61850
ASCII American Standard Code for Information Interchange
CMT Communication Management tool in PCM600
CPU Central processing unit
CT Current transformer
DPC Double-point control
DPS Double-point status
EMC Electromagnetic compatibility
Ethernet A standard for connecting a family of frame-based
computer networking technologies into a LAN
HMI Human-machine interface
HW Hardware
IEC International Electrotechnical Commission
IEC 61850 International standard for substation communication and
modeling
IED Intelligent electronic device (protection and control relay)
INS/INC Integer status
IP Internet protocol
IP address A set of four numbers between 0 and 255, separated by
periods. Each server connected to the Internet is assigned
a unique IP address that specifies the location for the TCP/
IP protocol.
LED
Light-emitting diode
LHMI Local human-machine interface
LSB Least significant bit
MCD Momentary change detect
MOM Momentary position
1MRS757645 B Section 5
Glossary
620 series 77
Communication Protocol Manual
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