DNP3 TCP

[isabellacog]

Hello everyone,

I am evaluating the integration of a protection relay that is currently configured for DNP3 TCP with Rapid SCADA.

Based on the documentation and forum discussions I found, Rapid SCADA has native support for Modbus, but DNP3 communication requires an intermediate OPC Server (such as Kepware, Matrikon, Triangle MicroWorks, etc.).

I would like to hear about your practical experience:

* In a solar power plant environment, is it worth keeping DNP3 communication through an OPC Server gateway to Rapid SCADA?
* What are the real advantages of DNP3 in this scenario compared to Modbus TCP?
* Is the additional layer (DNP3 → OPC → Rapid SCADA) generally stable and reliable for continuous operation?
* Considering maintenance, costs, and long-term support, would you recommend switching the relay to Modbus TCP when that option is available?

My goal is to monitor and collect data from protection relays in a photovoltaic power plant. I would like to understand whether there are significant operational benefits to keeping DNP3, or if Modbus TCP is generally the better choice when using Rapid SCADA.

Any recommendations or shared experiences would be greatly appreciated.

Thank you.

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