10.2
SEL-421 Relay Instruction Manual Date Code 20171021
Communications Interfaces
Communications Database
The METER region contains all the basic meter and energy information. This
region is updated every 0.5 seconds. See Table 10.3 for the Map.
Table 10.2 SEL-421 Database Structure—LOCAL Region
Address
(Hex)
Name Ty pe Description
0000 FID char[48] FID string
0030 BFID char[48] SEL
BOOT FID string
0060 SER_NUM char[16] Device Serial number, from factory settings
0070 PART_NUM char[24] Device part number, from factory settings
0088 CONFIG char[8] Device configuration string
(as reported in ID command)
0090 SPECIAL char[8] Special device configuration string
(as reported in ID command)
0098 DEVICE_ID char[40] Relay ID setting, from global settings
00C0 NODE_ID char[40] Station ID from global settings
00E8 GROUP int Active group
00E9 STATUS int Bit map of status flags: 0 for okay, 1 for failure
Table 10.3 SEL-421 Database Structure—METER Region (Sheet 1 of 3)
Address
(Hex)
Name Type Description
1000 _YEAR int 4-digit year when data were sampled
1001 DAY_OF_YEAR int 1–366 day when data were sampled
1002 TIME(ms) long int Time of day in ms when data were sampled
(0–86,400,00)
1004 FREQ float System frequency
1006 VDC1 float Battery 1 voltage
1008 VDC2 float Battery 2 voltage
100A,
100C
IA1 float[2] Line A-Phase current magnitude and phase
100E,
1010
IB1 float[2] Line B-Phase current magnitude and phase
1012,
1014
IC1 float[2] Line C-Phase current magnitude and phase
1016,
1018
I0_1 float[2] Line 0-sequence current magnitude and phase
101A,
101C
I1_1 float[2] Line 1-sequence current magnitude and phase
101E,
1020
I2_1 float[2] Line 2-sequence current magnitude and phase
1022,
1024
IA2 float[2] Breaker 1 A-Phase current magnitude and phase
1026,
1028
IB2 float[2] Breaker 1 B-Phase current magnitude and phase
102A,
102C
IC2 float[2] Breaker 1 C-Phase current magnitude and phase
102E,
1030
IA3 float[2] Breaker 2 A-Phase current magnitude and phase
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