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Old May 18th, 2009, 11:37 AM   #7
shooter
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Join Date: Sep 2002
Location: duketown
Posts: 2,613
PLC means programmable logic circuit
in general it means a sophistacted relay box that can be programmed with a ladder program. So simple on/off in a line and some timers/counters.
DCS means digital control system Almost same , however programming is done in basic, C, pascal. The in and outputs are not standard
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