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When we compare SCADA and DCS systems, all of the following are correct, EXCEPT:

DCS sub-systems are usually located within a more confined area, while SCADA field sites are geographically dispersed

DCS systems usually employ greater degrees of closed loop control than SCADA systems

DCS communications are usually performed using LAN technologies, while SCADA uses long-distance communication systems

SCADA systems are hardware-based, while DCS contains both hardware and software

Explanation

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