We have a customer who has a number of RTUs on a GSM network. They current use a proprietary protocol to communicate with the RTUs - This protocol supports retrieving buffered data from the RTU after a communications interruption, but it does not have any security features like encryption or authentication.
The RTUs support OPC-UA, so the customer wants to switch to using OPC-UA for the security it brings, but they also want to use the Historical Access part of the OPC-UA specification, to retrieved buffered data.
A colleague of mine previously used Kepware as middleware between a DNP3 RTU and a SCADA that used OPC-DA - in this solution Kepware was able to backfill buffered DNP3 data coming from the RTU into the SCADA (over OPC-DA).
Could KEPServerEX be used as middleware as follows:
RTU ---(OPC-UA Historical Access)---> KEPServerEX ---(OPC-UA Data Access)---> SCADA
In other words, could KEPServer, retieve the buffered data from the RTU (OPC-UA HA) and backfill it into the SCADA (OPC-UA DA)?
