D.25
Date Code 20150130 Instruction Manual SEL-787 Relay
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
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 amps to 11 amps. You may 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 amps will be 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 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 will
lose some precision as the last digit is rounded off in the scaling process, but
you can transmit the scaled value 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 required, 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 above, 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.
If it is important to maintain tight data coherency (that is, all data read of a
certain type was sampled or calculated at the same time), then you should
group that data together within your custom map. For example, if you want all the
Winding 1 currents to be coherent, you should group points IAW1_MAG,
Analog Inputs
--------------------------------------------------------------------------------
INDEX POINT LABEL EVENT CLASS SCALE FACTOR DEADBAND
0 IAW1_MAG 2 10.0000 1000
1 IBW1_MAG 2 10.0000 1000
2 ICW1_MAG 2 10.0000 1000
3 IAW2_MAG 2 10.0000 1000
4 IBW2_MAG 2 10.0000 1000
5 ICW2_MAG 2 10.0000 1000
6 IGW1_MAG 2 10.0000 1000
7 IGW2_MAG 2 10.0000 1000
8 IN_MAG 2 10.0000 1000
9 IAVW1MAG 2 10.0000 1000
10 IAVW2MAG 2 10.0000 1000
11 3I2W1MAG 2 10.0000 1000
12 3I2W2MAG 2 10.0000 1000
13 FREQ 2 1.0000 100
14 VAB_MAG 2 10.0000 2000
15 VBC_MAG 2 10.0000 2000
16 VCA_MAG 2 10.0000 2000
17 VAVE_MAG 2 10.0000 2000
18 3V2_MAG 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 NOOP
Figure D.4 Port MAP Command (Sheet 2 of 2)
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