SEL-3031 Instruction Manual Date Code 20181001
Job Done Examples
Setting Up a Point-to-Multipoint Link Using DNP3 SCADA Protocol
3.10
Setting Up a Point-to-Multipoint Link Using
DNP3 SCADA Protocol
Figure 3.11 SEL-3031 Point-to-Multipoint Example
The SEL-3031 is designed to work in P2P (Point-to-Point) and P2MP (Point-to-
Multipoint) modes. In P2MP mode Port 1 is the only active port. Port 2 and Port 3 are
disabled in this mode. This example will show how to setup a P2MP radio connection
where there is one radio at the master location connected to an SEL-3530 RTAC and
the other end will be three or more remote radios connected to SEL-651R recloser
controls. The protocol used in this example is DNP3. In P2MP mode, the radio works
with most multidrop addressable protocols, including MODBUS.
The radios set in P2MP mode operate by allowing the master to send information to all
of the remotes. Only the remote that is connected to the IED (SEL-651R) with the
correct SCADA address will respond back to the master. Data will collide if the remote
is not set up correctly where two remotes share the same address or sending unsolicited
data. All remote radios have the ability to transmit data to the master and the protocol
addressing determines which remote should respond to the master.
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