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Help me write a PLC program that senses the rotation

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ibrar

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HI All

i am connecting a encoder to my plc i want to read the possition of encoder and it rotation side (Clock wise, Anticlock wise). my encoder is giving signals A, B and index. can some body help me how to built a program to sense the rotation or in other words how to make decision thet from A and B which one come first.
i am using Modicon PLC and my software is Concept

thanks
 

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