SMP Gateway User Manual • 77
12 Interconnecting
SMP Gateways
It is possible to connect two SMP Gateways together, by the means of the Interconnections
feature. One advantage of such connectivity is the ability to concentrate data from multiple
SMP Gateways, which is very convenient considering the limited amount of IEDs that can be
monitored by a single SMP Gateway. You can also have a setup where the SCADA has only
access to one SMP Gateway (for security reasons, for example), while the substation actually
contains much more. It would be possible to interconnect two SMP Gateways using another
protocol, such as DNP3. However, it would require a considerable configuration effort, which is
not the case with Interconnections: data point information and configuration is exchanged between
both SMP Gateways.
The Interconnections feature and standard acquisition are based on the same master/slave
principles. For Interconnections, the SMP Gateway that provides the data is the slave gateway, and
the one that retrieves the data from the other is the master gateway. So, to connect two gateways
together, a slave Interconnections instance must be configured in the slave gateway, and a master
Interconnections instance must be configured in the master gateway.
Consider a substation configuration where an IED’s data is retrieved by an SMP Gateway called
Cedar Creek (i.e. the slave gateway). An SMP Gateway called Park Avenue (i.e. the master
gateway) needs to get connected to it to make the IED data available to the SCADA. This example
is presented in the following illustration:
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