WHAT IS THE DIFFERENCE BETWEEN PLC AND DCS
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Answer Posted / madhukar vangari
PLCs were designed to replace Relay Logic System with only
digital inputs and outputs early 60s whereas Dcs was
designed to cater the requirement of heavy process
industries with only analog inputs and outputs.
Nowaday PLCs are started having analogue I/Os and DCS with
digital I/Os.
Plcs execute sequential program and executes one program at
a time where as Dcs is multitasking in nature.
In plc PIDs are required to be tuned whereas PIDs are tuned
automaticaly in DCS
SCADA is integral part of DCS ,in case plc SCADA
needs to be designed with different scada software.
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