PLC Programmable logical controller
PO Power output, process object
RMS Root mean square
RTU Remote terminal unit
SGB Switchgroup for digital inputs
SGF Switchgroup for functions
SGL Switchgroup for LEDs
SGR Switchgroup for output contacts
SO Signal output
SP Second-pulse
SPA Data communication protocol developed by ABB
TCS Trip-circuit supervision
UDR User-defined register
UR Unsolicited reporting
174
REF610REF610
Feeder Protection Relay
Technical Reference Manual - ANSI Version
1MRS755535
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