R.4.22
SEL-421 Relay Reference Manual Date Code 20111215
Communications Interfaces
Communications Card
The TARGET region contains the entire visible Relay Word plus the rows
designated specifically for the TARGET region. This region is updated every
0.5 seconds. See Table 4.22 for the Map. See Appendix A: Relay Word Bits in
the Reference Manual for detailed information on the Relay Word bits.
The HISTORY region contains all information available in a History report for
the most recent 10 events. This region is updated within 15 seconds of any
new events. See Table 4.23 for the Map.
2008 IC float phase C demand current
200A I0 float 0-sequence demand current
200C I2 float 2-sequence demand current
200E PA float phase A demand real power
2010 PB float phase B demand real power
2012 PC float phase C demand real power
2014 P float total demand real power
2016 SA float phase A demand apparent power
2018 SB float phase B demand apparent power
201A SC float phase C demand apparent power
201C S float total demand apparent power
201E PK_IA float phase A demand current
2020 PK_IB float phase B demand current
2022 PK_IC float phase C demand current
2024 PK_I0 float 0-sequence demand current
2026 PK_I2 float 2-sequence demand current
2028 PK_PA float phase A demand real power
202A PK_PB float phase B demand real power
202C PK_PC float phase C demand real power
202E PK_P float total demand real power
2030 PK_SA float phase A demand apparent power
2032 PK_SB float phase B demand apparent power
2034 PK_SC float phase C demand apparent power
2036 PK_S float total demand apparent power
Table 4.22 SEL-421 Communications Card Database Structure—TARGET Region
Address
(Hex)
Name Type Description
3000 _YEAR int 4-digit year when data was sampled
3001 DAY_OF_YEAR int 1–366 day when data was sampled
3002 TIME(ms) long int Time of day in msec when data was sampled
(0–86,400,000)
3004 TARGET char[~240] Entire Relay Word with bit labels
Table 4.21 SEL-421 Communications Card Database Structure—
DEMAND Region (Sheet 2 of 2)
Address
(Hex)
Name Type Description
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