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What is the difference between a PLC (Programmable logic
controller) and DCS (distributed control system)?
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Answer Posted / jonny jain
1)PLC is small syetem in which no. of signals like DI,DO,AI,AO
are less and DCS is wwide system where no. of signals are more.
2)Working speed of PLC is high than DCS because no. of signals are less in PLC.
3)PLC used in small plant and DCS used big plant.
4)More no. of PLC are controled by one DCS
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