Hi,
Your question is quite general. It sounds more like an assignment type question?
The Forum is not in the habit of doing members homework for them. Until you can confirm this is not for homework, answers will be short coming. If it is homework, you must have had course material to at least know such basic and fundamental answers.
Give us some idea as to what you already know...
What do you think a DeviceNet Scanner is?
Where would you think you might use one?
We are eager to assist and teach, but please add some context to the reason for your questions. Then we can be of more assistance to you.
Regards,
George