11.20
SEL-421 Relay Instruction Manual Date Code 20171021
Relay Word Bits
Alphabetical List
IN517–IN524 Fourth optional I/O board Input 17–24 (if installed) 410
IO300OK Communications status of Interface Board 300 when installed or commissioned 403
IO400OK Communications status of Interface Board 400 when installed or commissioned 403
IO500OK Communications status of Interface Board 500 when installed or commissioned 403
KEY Transmit permissive trip signal 58
KEY1 Transmit general permissive trip 59
KEY3 Transmit three-phase permissive trip 59
KEYA Transmit A-Phase permissive trip (ECOMM = POTT3) 61
KEYB Transmit B-Phase permissive trip (ECOMM = POTT3) 61
KEYC Transmit C-Phase permissive trip (ECOMM = POTT3) 61
KEYD Transmit Directional permissive trip (ECOMM = POTT, EPTDIR = Y) 61
LB_DP01–LB_DP08 Local Bit 01–08 status display (SEL
OGIC Equation) 308
LB_DP09–LB_DP16 Local Bit 09–16 status display (SEL
OGIC Equation) 309
LB_DP17–LB_DP24 Local Bit 17–24 status display (SEL
OGIC Equation) 310
LB_DP25–LB_DP32 Local Bit 25–32 status display (SEL
OGIC Equation) 311
LB_SP01–LB_SP08 Local Bit 01–08 supervision (SEL
OGIC Equation) 304
LB_SP09–LB_SP16 Local Bit 09–16 supervision (SEL
OGIC Equation) 305
LB_SP17–LB_SP24 Local Bit 17–24 supervision (SEL
OGIC Equation) 306
LB_SP25–LB_SP32 Local Bit 25–32 supervision (SEL
OGIC Equation) 307
LB01–LB08 Local Bit 1–8 92
LB09–LB16 Local Bit 9–16 93
LB17–LB24 Local Bit 17–24 94
LB25–LB32 Local Bit 25–32 95
LBOKA Normal M
IRRORED BITS Communications Channel A status while in loopback mode 229
LBOKB Normal M
IRRORED BITS Communications Channel B status while in loopback mode 230
LCBF1 Circuit Breaker 1 load current circuit breaker failure 68
LCBF2 Circuit Breaker 2 load current circuit breaker failure 74
LD_DPFA Leading A-Phase displacement power factor 26
LD_DPFB Leading B-Phase displacement power factor 26
LD_DPFC Leading C-Phase displacement power factor 26
LD_DPF3 Leading three-phase displacement power factor 26
LEADBK0 No lead circuit breaker 44
LEADBK1 Lead circuit breaker = Circuit Breaker 1 44
LEADBK2 Lead circuit breaker = Circuit Breaker 2 44
LG_DPFA Lagging A-Phase displacement power factor 26
LG_DPFB Lagging B-Phase displacement power factor 26
LG_DPFC Lagging C-Phase displacement power factor 26
LG_DPF3 Lagging three-phase displacement power factor 26
LINK5A Link status of Port 5A connection 264
LINK5B Link status of Port 5B connection 264
LINK5C Link status of Port 5C connection 264
Table 11.1 Alphabetic List of Relay Word Bits (Sheet 20 of 34)
Name Description Row
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