The Safety Integrated Function Manual contains detailed information about the safety functions.
https://support.industry.siemens.com/cs/document/99668646

Further manuals pertaining to Safety Integrated in drive systems can be found on the Internet at 
https://support.industry.siemens.com/cs/ww/en/ps/13231/man

Further information about Safety Integrated in SINAMICS can be found on the Internet at 
http://www.siemens.com/safety-drives

Further information about Safety Integrated in SIMOTION can be found on the Internet at 
http://www.siemens.com/simotion-d-safety-integrated