Answer / george mathews

Its simple
Plant need to be upgraded and lots of instrument come and go
as technology changes
so

1 :- PLC can be reprogrammed and we can make the new change
and run the plant according to the new condition.

2 :- It can save human hour and Error factor and also
malfunction.

Answer / cae

And also it can work at very hazardous places with great accuracy where humans can not work. it operates at low voltage levels like 12v or 24v DC, so that losses are very less. there is a chance of modify the ladder logic more frequently as per the process needs.

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