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depend upon
industrial
one hundred percent
Scemens PLC,( ON and OFF control systen PLC).
In Industry, PLC actually majorily replaced:
1) Relay Logic
2) Dedicated Control Cards / Systems.
As far as Relay Logic is involved PLC must replace it100%.
As far as Dedicated Control Cards / Systems not more than70% to90%.
Eighty percent Of PLC is USed in Industries Now a Days
DEPEND UPON I/O INTEGRATION AND INDUSTRY REQUIRMENT