eBook: Automating Manufacturing Systems; with PLCs
   



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4.7 PRACTICE PROBLEM SOLUTIONS


1. capacitive proximity, contact switch, photo-optic retroreflective/diffuse, ultrasonic
2. materials that can be sensed, environmental factors such as dirt, distance to object
3. the sinking output will pass only DC in a single direction, whereas a switch can pass AC and DC.
4.


5.


6.


7.


8.


9.



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