16.30
SEL-400 Series Relays Instruction Manual Date Code 20171006
DNP3 Communication
DNP3 Serial Application Example
In this example, the polling method employed by the RTU DNP3 master is polled
report-by-exception. The master device normally polls for events only. 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 not
continuously polling and receiving data that are not changing.
TERTIM2 0 No delay before accepting termination string
DNPADR 101 DNP3 address = 101
DNPID “RELAY1-DNP” DNP ID for Object 0 self-description
DNPMAP 1 Use DNP3 Map 1
ECLASSB 1 Event Class 1 for binary event data
ECLASSC 1 Event Class 1 for counter event data
ECLASSA 1 Event Class 1 for analog event data
ECLASSV OFF Disable virtual terminal event data (this feature is not
supported by the DNP3 master)
TIMERQ I Ignore time-set request because IRIG-B is used for
time synchronization
DECPLA 1 Scale current, multiplying by 10 to send amperes and
tenths of an ampere. The relay would report a value of
10.4 as 104, which would remain unscaled at the mas-
ter.
DECPLV 2 Scale voltage, multiplying by 100 to send kilovolts,
tenths, and hundredths of a kilovolt
DECPLM 2 Scale miscellaneous analog data, multiplying by 100
to send whole numbers and hundredths. The relay
would report a value of 5.25 as 525, which would
remain unscaled at the master.
STIMEO 10.0 10 second select before operate time-out
DRETRY OFF Turn off data link retries
MINDLY 0.05 Minimum delay from DCD to TX
MAXDLY 0.10 Maximum delay from DCD to TX
PREDLY 0.025 Settle time from RTS on to TX to allow EIA-485
transceiver to switch to transmit mode
PSTDLY 0.00 Settle time from TX to RTS off—not required in this
application
DNPCL Y Enable controls for DNP3
AIVAR 2 Default AI variation
ANADBA 50 Analog reporting dead band for currents, 5 A based on
DECPLA scaling factor
ANADBV 100 Analog reporting dead band for voltages, 1 kV based
on DECPLV scaling factor
ANADBM 100 Miscellaneous analog value dead band, based on
DECPLM scaling factor
ETIMEO 10 Event Message Confirm Time-Out, 10 seconds
UNSOL N Unsolicited reporting disabled (data retrieval method
is polled report-by-exception)
MODEM N No modem connected to port
Table 16.12 SEL-421 Port 3 Example Settings (Sheet 2 of 2)
Setting Name Setting Description
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