16.7
Date Code 20171006 Instruction Manual SEL-400 Series Relays
DNP3 Communication
DNP3 in the Relay
DNP3 in the Relay
The relay is a DNP3-2009 Level 2 outstation device. The relay DNP3 interface
has the capabilities summarized in Tab le 16.5 .
Data Access
You can use any of the data access methods listed in Table 16.6. Table 16.6 also
lists the relay DNP3 settings. You must configure the DNP3 master for the data
access method you select.
Table 16.4 TCP/UDP Selection Guidelines
Use in the case of… TCP UDP
Most situations X
Non-broadcast or multicast X
Mesh Topology WAN X
Broadcast X
Multicast X
High-reliability single-segment LAN X
Pay-per-byte, non-mesh WAN, for example, Cellular Digital Packet Data (CDPD) X
Low priority data, for example, data monitor or configuration information X
Table 16.5 Relay DNP3 Feature Summary
Feature Application
DNP3 event data reporting More efficient polling through event collection or unsolic-
ited data
Time-tagged events Time-stamped SER data
Control output relay blocks Operator-initiated control
Write analog set point Change the active protection settings group
Time synchronization Set the relay time from the master station or automatically
request time synchronization from the master
Custom mapping Increase communications efficiency by organizing data and
reducing available data to what you need for your applica-
tion
Modem support Reduce the cost of the communications channel by either
master dialing to relay or relay dialing to master
Analog dead-band settings per
session
Dead bands may be set to different values per session
depending on desired application
Virtual Terminal Provides engineering access for configuration, diagnostics,
and other tasks over the existing DNP3 connection
TEST DB2 command Test DNP3 protocol interface without disturbing protection
Support for Object 0 Device
Attributes
Provides Device Attributes (Device ID, Number of binary,
analog and counter points, Manufacturer information, etc.)
for the device specific to the current connected DNP3 ses-
sion in use
XML DNP3 Device Profile
Document
The DNP3 Device Profile document contains the complete
information on DNP3 Protocol support in the relay. This
information is available in XML format.
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