programmable logic control

can anyone guide me to websites where i can find detailed information on how 'PLC' and 'SCADA' works. thanx in advance Sudip Chatterjee.

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These and vendor sites:
http://www.plcs.net/contents.shtml
http://www.mrplc.com /
http://electrical-contractor.net/The_Store/PLC_Products.htm?source=google

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