D.24
SEL-751 Relay Instruction Manual Date Code 20170927
DNP3 Communications
DNP3 Documentation
Default scaling and dead bands can be overridden by per-point scaling and
dead band. See Configurable Data Mapping for more information. Dead
bands for analog inputs can also be modified by writing to object 34.
A dead band check is done after any scaling has been applied. Event class
messages are generated whenever an input changes beyond the value given by
the appropriate dead band setting. The voltage and current phase angles only
generate an event if, in addition to their dead band check, the corresponding
magnitude changes beyond its own dead band. Analog inputs are scanned at
approximately a 1 second rate. All events generated during a scan use the time
the scan was initiated.
Configurable Data
Mapping
One of the most powerful features of the SEL-751 implementation is the
ability to remap DNP3 data and, for analog values, specify per-point scaling
and dead bands. Remapping is the process of selecting data from the reference
map and organizing it into a data subset optimized for your application. The
SEL-751 uses object and point labels, rather than point indices, to streamline
the remapping process. This enables you to quickly create a custom map
without having to search for each point index in a large reference map.
You can use any of the three available DNP3 maps simultaneously with as
many as three unique DNP3 masters. Each map is initially populated with
default data points, as described in Default Data Map on page D.20. You can
remap the points in a default map to create a custom map with as many as the
following:
➤ 100 Binary Inputs (Select from supported Relay Word bits in
Appendix K: Relay Word Bits)
➤ 32 Binary Outputs
➤ 100 Analog Inputs
➤ 32 Analog Outputs
➤ 32 Counters
You can use the SHOW DNP x <Enter> command to view the DNP3 data
map settings, where x is the DNP3 map number from 1 to 3. See Figure D.3
for an example display of map 1.
=>>SHO DNP 1 <Enter>
DNP Map 1 Settings
Binary Input Map
BI_00 := ENABLED
BI_01 := TRIP_LED
BI_02 := TLED_01
BI_03 := TLED_02
…
BI_97 := IN101
BI_98 := IN102
BI_99 := 50P1P
Binary Output Map
BO_00 := RB01
BO_01 := RB02
BO_02 := RB03
…
BO_29 := RB30
BO_30 := RB31
BO_31 := RB32
Figure D.3 Sample Response to SHO DNP Command
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