Answer Posted / midhun pius 09946626427
Basically relay is a electromagnetic device,we can't do any
changes in its mode of operation it is works only normally
open/normally closed conditions as per its default
manufacturing set up.
But a PLC is a Programmable Logic Controller. It has a
number of inputs and out puts, we can define its conditions
by using a computer program known as Ladder Logic program.
Any time we can easily change that conditions by the ladder
program1
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