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
ACC Actual channel, related to IEC 60870-5-103 disturbance
record
ACK Positive acknowledgement
ACT 1. Application Configuration tool in PCM600
2. Trip status in IEC 61850
ASCII American Standard Code for Information Interchange
ASDU Application-layer service data unit
CB Circuit breaker
COMTRADE Common format for transient data exchange for power
systems. Defined by the IEEE Standard.
COT Cause of transmission
Data set The content basis for reporting and logging containing
references to the data and data attribute values
DFC Data flow control
DPI Double-point information
EIA-485 Serial communication standard according to Electronics
Industries Association
EMC Electromagnetic compatibility
FAN Fault number
FUN Function type
GI General interrogation
HMI Human-machine interface
IEC International Electrotechnical Commission
IEC 60870-5-101 Companion standard for basic telecontrol tasks
IEC 60870-5-103 1. Communication standard for protective equipment
2. A serial master/slave protocol for point-to-point
communication
IEC 60870-5-104 Network access for IEC 60870-5-101
IEC 61850 International standard for substation communication and
modeling
1MRS757647 C Section 5
Glossary
620 series 35
Communication Protocol Manual
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