Answer / h v k kumar

simply plc is a controller we can control analog and digital
i/o s but i/0 limit is there in plcs.dcs is nothing but
networking of plcs.EX
plc1+plc2+smart instruments+mc baesd instruments all are
controlled by dcs at a time .ic has redundancy also

Answer / nitin pathak

Actually in todays world there is a very thin line between
a DCS and a PLC,in simple words when the plant process is
controlled with the help of a computer(all the processing
done by the server) is called a DCS and when the process
control is done with the help of stand alone contollers
then it is called a PLC.

Nitin Pathak
Lafarge Cement

Answer / shani_dms

yes ur rite but i want to addition
first plc also has redundancy.

Answer / sharma

the difference between is that we can detect the error in plc
but in dcs we can find the exact point of error.
where the actual problem is.
we can also control the different error at different

sir, i preparing hpcl,ongc,barc,hal exams(instrumentation engg)pls send a placement papers

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