A1 Function Groups
CBF_1 Circuit breaker failure protection
CBF_2 Circuit breaker failure protection
CBF_3 Circuit breaker failure protection
CBF_4 Circuit breaker failure protection
COMM1 “Logical” communication interface 1
COMM2 “Logical” communication interface 2
COUNT Binary counts
CTS Current transformer supervision
DIFF Differential protection
DTOC1 Definite-time overcurrent protection
DTOC2 Definite-time overcurrent protection
DTOC3 Definite-time overcurrent protection
DTOC4
DVICE Device
F_KEY Configurable function keys
f<> Over-/underfrequency protection
FT_DA Fault data acquisition
FT_RC Fault recording
GOOSE Generic Object Orientated Substation Events
IDMT1 Inverse-time overcurrent protection
IDMT2 Inverse-time overcurrent protection
IDMT3 Inverse-time overcurrent protection
IEC IEC 61850 Communication
INP Binary input
IRIGB IRIG‑B interface
LED LED indicators
LIM_1 Limit value monitoring
LIM_2 Limit value monitoring
LIM_3 Limit value monitoring
LIMIT Limit value monitoring
P634
P634/EN M/R-42-A // P634‑311‑653 A1-1