You could replace the 5/03 with an eBay 5/04 (cheaper than the converter) run Blue Hose in a DH+ configuration. Use a ControlLogix chassis with two DH/RIO cards and you have a rugged easy to configure system you can do SCADA with. If you get a tManager from Online Development you can even push data directly to a SQL database of fire a stored procedure to an SQL server.