Answer / sumith

The main difference is that
the PLC has one processor(it has limitations for memory
space) and it can used to control one plant or 2 small plants.
The DCS has many processors and it can be used for control
many plants at one time.

Answer / sandip patel

plc has central controller where as dcs has dictributed control.
scanning time of the dcs is more than plc.

Answer / karikhul

plc is centralized controller while dcs distributive.plc has 1 processor card n dcs has 2 processor cards if one fails means v can copy d content frm one 2 another jst lyk master n slave. so it wont disturb d plant also.

Answer / shinde k v

plc means programmable logic control which has fixed
program .dcs means distributed control system which
distribute functionally and physically.

Answer / goutam

The main difference is that PLC needs an external SCADA s/w for process visualization bt in DCS scada is inbuilt.

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