R.6.49
Date Code 20111215 Reference Manual SEL-421 Relay
DNP3 Communications
DNP LAN/WAN Application Example
DNP LAN/WAN Application Example
Application
This example uses an SEL-421 connected to an RTU over an Ethernet (TCP)
network. The RTU collects basic metering information from the relay. The
network for this example is shown in Figure 6.1.
Figure 6.3 DNP LAN/WAN Application Example Ethernet Network
The polling method employed by the RTU DNP3 master is polled report-by-
exception, so it normally only does event polls. Once every 25 event polls, the
master polls for Class 0 data (status of all points). This polling method allows
the master to collect data efficiently from the IEDs by only polling and
receiving data that has changed.
The RTU, which will act as the DNP3 master to the SEL-421 slave, has an IP
address of 192.9.0.1 and a DNP3 address of 12. The SEL-421 should be
assigned a DNP3 address of 101.
All event data (analog, binary, counter) should be assigned to CLASS 1.
All Binary Inputs should have SOE-quality timestamps.
The metering, status data and controls that the RTU will receive and/or send to
the relay are listed in Ta ble 6 .17.
175 RB32/RB31 PULSE
remote bit
RB32
PULSE
remote bit
RB31
PULSE
remote bit
RB32
PULSE
remote bit
RB31
PULSE
remote bit
RB32
PULSE
remote bit
RB31
176 CB1 PULSE CC1,
Circuit
Breaker 1
close bit
PULSE OC1,
Circuit
Breaker 1
open bit
PULSE OC1,
Circuit
Breaker 1
open bit
PULSE CC1,
Circuit
Breaker 1
close bit
PULSE OC1,
Circuit
Breaker 1
open bit
PULSE CC1,
Circuit
Breaker 1
close bit
177 CB2 PULSE CC2,
Circuit
Breaker 2
close bit
PULSE OC2,
Circuit
Breaker 2
open bit
PULSE OC2,
Circuit
Breaker 2
open bit
PULSE CC2,
Circuit
Breaker 2
close bit
PULSE OC2,
Circuit
Breaker 2
open bit
PULSE CC2,
Circuit
Breaker 2
close bit
Tabl e 6 . 25 SEL -421 DNP L AN/ WA N Ob j ect 12 Control Point Operation (Sheet 2 of 2)
Indices
Control
Points
Trip / Close Pairs Code Selection Operation
Close (0x4X) Trip (0x8X) Latch On (3) Latch Off (4) Pulse On (1) Pulse Off (2)
RTU
SEL-421
Non-DNP IED
To SCADA
Network Switch
...
SEL-2030
Non-DNP IED
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