The system has been in for 5 years, and it has been very reliable. The migration from the older version GraphWorX to the new has been a success. All aspects of the change over from interfacing and gathering data from the Rotork Valve package (Modbus) to the new OPC interface from ICONICS for the Allen Bradley PLC5 were completed in a timely manor with no down time Bill Cole, General Manager Keokuk Municipal Water Works.