Good morning Nghia,

Thanks for your question.

You could use the Rockwell Knowledgebase and Sample Code examples to further your understanding of their PLCs:

Knowbase: https://rockwellautomation.custhelp.com/
Sample Code: https://www.rockwellautomation.com/en_NA/sample-code/overview.page

Sincerely,

Shawn Tierney,
Instructor, The Automation School