PLC Based AC motor Protection project help need

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PLC Based AC motor Protection project help needed

Hello Everyone,
my final year project is to protect ac motor using PLC.
i have done over voltage,current, temperature protection.
But i need over speed protection system.i need help about that.
how can i do it??how the encoder use??
how to make the encoder??pls help me Friends
tnx
 

what kind of plc and programming you are using ?
 

PLC > LG K7M/MK-120S
with A/D converter i need to use a encoder which give me dc output(V/I) with 0~10V or 0~800mA.
I made Plc prog. its just compare the value. i am in trouble with over speed protection analog part.
 

you are programming with ladder diagramme ??
 

can you share your project data plzzz. ialso want to do this project
 

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