Siemens AG provides all the user manuals and documentations for her CNC controls of Sinumerik series for free as download in PDF format.
These documents are available in English and many other languages.
Here you can find the following user manuals as download:
More documentation regarding product series SINUMERIK, SINAMICS, SIMOTION and SIMOTICS you can find in Industry Online Support of Siemens AG on:
http://www.automation.siemens.com/doconweb/.