Section 4 Glossary
AFL Application function block library
AR Autoreclosure
CB Circuit breaker
CROB Control output block
CTO Common time of occurrence. The time and date CTO object is
an information object that represents the absolute time of day.
DA Data attribute
DNP3 A distributed network protocol originally developed by
Westronic. The DNP3 Users Group has the ownership of the
protocol and assumes responsibility for its evolution.
DO Data object
EMC Electromagnetic compatibility
HMI Human-machine interface
I/O Input/output
IEC International Electrotechnical Commission
IEC 61850 International standard for substation communication and
modelling
IED Intelligent electronic device
LED Light-emitting diode
LN Logical node
PCM600 Protection and Control IED Manager
SBO Select-before-operate
1MRS756879 A Section 4
Glossary
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