what is the difference between plc & DCS?
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Answer Posted / sumit_110386
PLC Simplified with limited logic control for like a
machine or Simple process with limited interlock logic -
progamme can be modified easily.& also proto type.This will
give only indication of faiiure.No recording the event or
process parameter ,with limited memory.Cost wise it is very
cheap
Dcs concern Huge multiple logic controlls with >1000 of
inter lock for process of power plant or refineries or any
process Industries it will give all types of alarm in soft
copy & hard copy about process , failure & record all the
process input & out put parameters & efficiency if
required .(like Boiler,Turbine, Generator controlls Switch
gear cotrolls ie power generation to Transmission It will
cover up everything) Very huge memory back up, failuer rate
very less.process parameter all are fixed cannot be changed
by Individual. Troube shooting very easy .production will
not be affected at all .( (stand by system will take care
automatically change over)Cost will be very high.
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