R.4.19
Date Code 20111215 Reference Manual SEL-421 Relay
Communications Interfaces
Communications Card
Data within the communications card regions is available for mapping to any
protocol over the Ethernet interface.
The LOCAL region contains the device FID, SID, and RID. It will also
provide appropriate status points. This region is updated on settings changes
and whenever monitored status points change. See Table 4.19.
The METER region contains all the basic meter and energy information. This
region is updated every 0.5 seconds. See Table 4.20 for the Map.
Table 4.18 Communications Card Database Regions
Region Name Contents Update Rate
LOCAL Relay identification data including
FID, Relay ID, and active protec-
tion settings group
Updated on settings change and
whenever monitored values change
METER Real-time metering and measure-
ment data
0.5 s
DEMAND Demand and peak demand mea-
surement data
15 s
TARGET Selected rows of Relay Word bit
data
0.5 s
HISTORY Relay event history records for the
20 most recent events
Within 15 s of any new event
BREAKER Summary circuit breaker monitor
data updated every 15 s
15 s
STATUS Self-test diagnostic status data 5 s
ANALOGS Protection and automation math
variables
0.5 s
STATE Elements defined as SER points 0.5 s of any new event
Table 4.19 SEL-421 Communications Card Database Structure—LOCAL
Region
Address
(Hex)
Name Ty pe Description
0000 FID char[48] FID string
0030 BFID char[48] SELboot 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
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