The DNP 3.0 protocol is defined and administered by the DNP Users Group. For further information on DNP 3.0 and
the protocol specifications, please see the DNP website (www.dnp.org).
7.3.1 PHYSICAL CONNECTION AND LINK LAYER
DNP 3.0 can be used with two physical layer protocols: EIA(RS)485, or Ethernet.
Several connection options are available for DNP 3.0
● Rear Port 1 (RP1) - for permanent SCADA connection via RS485
● Optional fibre port (RP1 in slot A) - for permanent SCADA connection via optical fibre
● An RJ45 connection on an optional Ethernet board - for permanent SCADA Ethernet connection
● A fibre connection on an optional Ethernet board - for permanent SCADA Ethernet connection
The IED address and baud rate can be selected using the front panel menu or by the settings application software.
When using a serial interface, the data format is: 1 start bit, 8 data bits, 1 stop bit and optional configurable parity
bit.
7.3.2
OBJECT 1 BINARY INPUTS
Object 1, binary inputs, contains information describing the state of signals in the IED, which mostly form part of
the digital data bus (DDB). In general these include the state of the output contacts and opto-inputs, alarm signals,
and protection start and trip signals. The ‘DDB number’ column in the device profile document provides the DDB
numbers for the DNP 3.0 point data. These can be used to cross-reference to the DDB definition list. See the
relevant Menu Database document. The binary input points can also be read as change events using Object 2 and
Object 60 for class 1-3 event data.
7.3.3
OBJECT 10 BINARY OUTPUTS
Object 10, binary outputs, contains commands that can be operated using DNP 3.0. Therefore the points accept
commands of type pulse on (null, trip, close) and latch on/off as detailed in the device profile in the relevant Menu
Database document, and execute the command once for either command. The other fields are ignored (queue,
clear, trip/close, in time and off time).
There is an additional image of the Control Inputs. Described as Alias Control Inputs, they reflect the state of the
Control Input, but with a dynamic nature.
● If the Control Input DDB signal is already SET and a new DNP SET command is sent to the Control Input, the
Control Input DDB signal goes momentarily to RESET and then back to SET.
● If the Control Input DDB signal is already RESET and a new DNP RESET command is sent to the Control
Input, the Control Input DDB signal goes momentarily to SET and then back to RESET.
Chapter 22 - Communications P543i/P545i
576 P54x1i-TM-EN-1
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