D.26
SEL-751 Relay Instruction Manual Date Code 20170927
DNP3 Communications
DNP3 Documentation
You can use the command SET DNP x, where x is the map number, to edit or
create custom DNP3 data maps. You can also use the
ACSELERATOR
QuickSet SEL-5030 Software, which is recommended for this purpose.
Scaling factors allow you to overcome the limitations imposed by the integer
nature of the default variations of Objects 30 and 32. For example, the device
rounds a value of 11.4 A to 11 A. You can use scaling to include decimal point
values by multiplying by a number larger than one. If you use 10 as a scaling factor,
11.4 A is transmitted as 114. You must divide the value by 10 in the master to see
the original value including one decimal place.
You can also use scaling to avoid overflowing the 16-bit maximum integer
value of 32767. For example, if you have a value that can reach 157834, you
cannot send it by using DNP3 16-bit analog object variations. You could use a
scaling factor of 0.1 so that the maximum value reported is 15783. You can
then multiply the value by 10 in the master to see a value of 157830. You lose
some precision as the last digit is rounded off in the scaling process, but you
can transmit the scaled value by using standard DNP3 Objects 30 and 32.
You can customize the DNP3 analog input map with per-point scaling, and
dead-band settings. Per-point customization is not necessary, but class scaling
(DECPLA, DECPLV, and DECPLM) and dead-band (ANADBA, ANADBV,
and ANADBM) settings are applied to indices that do not have per-point
entries. Unlike per-point scaling described previously, class-level scaling is
specified by an integer in the range 0–3 (inclusive), which indicates the
number of decimal place shifts. In other words, you should select 0 to multiply
by 1, 1 for 10, 2 for 100, or 3 for 1000.
Counters
--------------------------------------------------------------------------------
INDEX POINT LABEL EVENT CLASS DEADBAND
0 SC01 0 1
1 SC02 0 1
2 SC03 0 1
…
29 SC30 0 1
30 SC31 0 1
31 SC32 0 1
Analog Inputs
--------------------------------------------------------------------------------
INDEX POINT LABEL EVENT CLASS SCALE FACTOR DEADBAND
0 IA_MAG 2 10.0000 1000
1 IB_MAG 2 10.0000 1000
2 IC_MAG 2 10.0000 1000
3 IG_MAG 2 10.0000 1000
4 IN_MAG 2 10.0000 1000
5 IAV 2 10.0000 1000
6 3I2 2 10.0000 1000
7 FREQ 2 1.0000 100
8 VAB_MAG 2 10.0000 2000
9 VBC_MAG 2 10.0000 2000
10 VCA_MAG 2 10.0000 2000
11 VAVE 2 10.0000 2000
12 3V2 2 10.0000 2000
…
…
96 P 2 10.0000 100
97 Q 2 10.0000 100
98 S 2 10.0000 100
99 PF 2 10.0000 100
Analog Outputs
--------------------------------------------------------------------------------
INDEX POINT LABEL
0 GROUP
1 RA001
Figure D.4 Port MAP Command (Continued)
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