Answer Posted / sajid

you are very correct..but u forgot one main thing..the scan
for PLC is lessthan DCS..
scan time for PLC is 100ms and scan time for DCS is 500 ms..
so that in indusrties they are using the PLC's for critical
operations along with DCS..such as shutdown or emergency
operations..

Regards..

SAJID
INSTRUMENTATION ENGINEER

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