Operations at the Collier County North County Regional Water Treatment Plant are assisted by its control and information system. The old control system used Siemens/Texas Instruments 555 and 315 PLCs for monitoring and automatic control using remote I/O over a Profibus network.

A graphics interface to the plant operations staff was provided by a PC-based SCADA/HMI system using Iconics Genesis software on two operator workstations and a SCADA server. Engineering and operator workstations had reached an age of declining reliability, and the PLC/remote I/O network demonstrated serious performance problems. Carollo was retained by the County to:

• Provide evaluations, upgrade recommendations, and design-build services for the control and information system including concept and architecture, networks, PLC/HMI hardware, redundancy, reporting, and data sharing.
• Replace all existing Genesis SCADA/HMI
  software with the County standard, Intellution iFix.
• Install a fiber optic based Ethernet network to support communications between all PCs and PLC CPUs.
• Replace existing PLC CPUs with new Allen-Bradley ControlLogix CPUs and completely reprogram all PLC controls, including the
  nanofiltration and reverse osmosis membrane treatment units.
• Replace the existing process data reporting system with a new
  Proficy Historian and Xcel Reporter report generation package.
  

Carollo served effectively as the general contractor by preparing
the scope of work for and supervising the work of the electrical
installation contractor. Carollo purchased and installed the computer
equipment and software. The project was completed successfully
on time and on budget, despite technical and cutover challenges.
Carollo has been retained to provide continuing services to Collier
County.