SCADA IN WATER SECURITY
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S C A D A I N W A T E R S E C U R I T Y
SCADA is a monitoring system that is networked throughout their entire operation. The system would provide constant monitoring of all vulnerable areas. It would immediately report any security breaches or abnormal operating conditions. It would eliminate any necessity for regular patrols and drastically reduce the frequency of visits to remote sites.
The system would be tolerant of efforts to defeat it. It would continue operating if the power were cut off or a communication line severed. It would be accessible to operations people even if the control room were disabled or evacuated. It would provide security from hacking. The system also would be able to automatically react to conditions and perform control actions, which could safely shut down processes or isolate sections of the water distribution system.
LEVERAGING THE SCADA SYSTEM
Utilizing the SCADA system to its fullest is the best way for water companies to leverage existing infrastructure and available resources. With such capabilities and coverage at your service, the SCADA system should not merely be one aspect of your operation to consider in a security assessment.
A SCADA system linked to perimeter monitoring devices can either significantly reduce or eliminate the need for manned patrols. Unlike patrols, the SCADA system can provide constant monitoring of all locations. Security systems or equipment, including video cameras, motion detectors, contact switches, keypad entry devices and card readers, can be readily interfaced either directly to the SCADA network or via a nearby remote terminal unit (RTU).
Security breaches are reported to the operations staff in the same manner as process failures—via the alarm system that is built-in to all SCADA systems. SCADA systems alert operators via a broad array of visual indications on graphical displays, as well as audible alarms.
Today's SCADA systems further offer alarm management, which prevents operator overload in cases where many alarms occur within a short time. It can also overcome deliberate attempts to decoy operators. Alarm management filters alarms by location, logical grouping or priority and keeps operators focused.
SCADA systems can also automatically react to conditions and perform control actions, such as emergency shutdowns of processes, starting or stopping pumps, opening/closing valves, etc. Input for these actions can come from anywhere on the network.
SCADA system can even provide detection of biohazards or chemical contaminants in water supply. They would provide standard interfaces, which allow alarms to be immediately reported through the SCADA system.
ENHANCED UTILIZATION OF THE SCADA SYSTEM
In its most simple implementation, a SCADA system can still reliably distinguish between normal and abnormal operation. Even basic monitoring functions include the discrete, limit and rate alarms mentioned earlier. As in the pump station example, control actions can also be verified and alarms set to indicate failures.
Alarm limits can also dynamically follow the process. For example, a ratio alarm could be set if the chlorinator feed rate were inappropriate to the water flow rate, even if it were within fixed high and low limits. If someone tampered with the chlorinator setting, this setup would catch it and report an alarm. Also a chlorine analyzer further downstream could also back up this system.
Perhaps the most advanced functions are performed when the SCADA system is used in conjunction with a modeling and simulation system. If the SCADA system is networked with the modeling and simulation system, it can provide live process information to build a model of your entire distribution system.
The model can be used to establish feed forward controls and run the process with increased efficiency. It can also provide for back-up alarming. If a process alarm, e.g. for a pump failure, does not work, the inevitable effect elsewhere in the system can still result in an alarm, which reports the pump failure as the likely cause.
ADVANTAGES OF SCADA ON OTHER SYSTEMS
Systems similar to SCADA systems are routinely seen in factories, treatment plants etc. These are often referred to as Distributed Control Systems (DCS). They have similar functions to SCADA systems, but the field data gathering or control units are usually located within a more confined area. Communications may be via a local area network (LAN), and will normally be reliable and high speed. A DCS system usually employs significant amounts of closed loop control.SCADA systems on the other hand generally cover larger geographic areas, and rely on a variety of communications systems that are normally less reliable than a LAN. Closed loop control in this situation is less desirable.
A major advantage of SCADA systems is that security measures are coordinated with operations. Many security systems and other recommended measures are not necessarily coordinated and require significant effort to do so.
General Advantages:
• Reduced waste of human resources.
• High level of software reusability creates a focus to problem solving.
• Reducing misunderstanding and errors.
• Provided programming techniques usable in broad area; general industrial control.
• Combines harmoniously different components from different locations, countries and projects.
Advantages for suppliers of production units (machines) :
• Provides more independence towards suppliers at control level.
• Provides basis for reuse of software across platforms .
• Higher flexibility in personnel: not limited to one system only.
• Less training required. j
• High level of reusability reduces cost and increases in planning.
• Provides tools to specify requirements at higher level .
• Better comparision between different offers , especially software development.
• Provides page link to existing personnel.
• Usable world wide, again & again.
• Provides a standard communication tool between engineers at different locations.
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