SCADA Software

A typical SCADA system provides a Human Machine Interface (HMI) allowing the operator to visualize all the functions as the system is operating. The operator can also use the HMI to change set points, view critical condition alerts and warnings, and analyze, archive or present data trends. Since the advent of Windows NT, the HMI software can be installed on PC hardware as a reliable representation of the real system at work.

Common HMI software packages include Cimplicity (GE-Fanuc), RSView (Rockwell Automation), IFIX (Intellution) and InTouch (Wonderware). Most of these software packages use standard data manipulation/presentation tools for reporting and archiving data and integrate well with Microsoft Excel, Access and Word.

Web-based technology is widely being accepted as well. Data collected by the SCADA system is sent to web servers that dynamically generate HTML pages. These pages are then sent to a LAN system at the operator’s site or published to the Internet.

THE MICROPROCESSOR OPTION

Now that you have a basic understanding of the SCADA system components, you may want to consider utilizing a microprocessor (MP) and/or a PLC-based SCADA system over a basic RTU or a proprietary system for the following reasons:

MPs, like MTUs, can continuously collect, process and store data, operating independently from the MTU through "intelligent" programming. In addition, by utilizing the EPG 2551 microprocessor-based level meter (pictured), you can have a robust SCADA system with both a master and a local display that automatically gathers, processes, and reports data necessary to comply with local, state and federal regulations in formats that integrate well will Microsoft Excel, Access and Word.

MPs can provide security and monitoring of door switches, heat and motion detectors. Managers/operators can be informed 24 hours a day through automatic email, paging and dial-up call features. Multiple users can easily be added and if open architecture protocol is used, future equipment can easily be integrated. Since MPs have no moving parts, they are extremely reliable and can be designed to be repairable with components that any local electrical distributor supplies.

MP-based SCADA system can reduce the number of man-hours needed for on-site visual inspections, adjustments, data collection and logging. Continually monitoring and troubleshooting potential problems increases equipment life, reduces service calls, reduces customer complaints and increases system efficiency. Simply put, open-architecture, MP-based SCADA systems are an excellent means for process control facilities to save time and money.