ABB 620 Series Manual page 34

Section 6
Glossary
28
IEC 61850-8-1 A communication protocol based on the IEC 61850 standard
series
IED Intelligent electronic device
ISO International Standard Organization
LED Light-emitting diode
LHMI Local human-machine interface
Modbus A serial communication protocol developed by the Modicon
company in 1979. Originally used for communication in PLCs
and RTU devices.
OSI Open systems interconnection
PCM600 Protection and Control IED Manager
RTU Remote terminal unit
SDU Service data unit
SPC Single-point status of a controllable object
TCP/IP Transmission Control Protocol/Internet Protocol
UL Underwriters Laboratories
UR Unsolicited response
WHMI Web human-machine interface
1MAC459571-IB C
620 series ANSI
Communication Protocol Manual