DNP3 to PLC conversion (modbus)

I need to replace legacy RTU's with PLC's or other devices that will act as a slave in communicating DNP3 with a master. We must communicate DNP3 to hardwired controls (300- 500 points). First plan is to use protocol translator talking to PLC to hard wired controls. I would prefer a plc to handle both conversion and hard wire control interface but have not identified a suitable plc brand or model.

This brand suppots DNP3 protocol

http://www.controlmicrosystems.com/

Consider this: http://www.dnp.org/Modules/Implementors/Default.aspx
As for the translator concept including local management capabilities: http://www.cybectec.com/en/products/smp/smp.htm. Another valuable option may be this one: http://www.serck-controls.com/Technology/RTUs/. The programming approaches -if required- are respectively based on 3S CoDeSys and IsaGraf (both of them IEC61131 compliant). Well known in Power industry.