Have a look at the Hans Berger books - Automating with Step 7
Not the easiest read BUT very good.
here are some links to other information -
http://support.automation.siemens.c...ib.csFetch&nodeid=18653849&forcedownload=true
http://support.automation.siemens.c...ib.csFetch&nodeid=18653208&forcedownload=true
http://support.automation.siemens.c...ib.csFetch&nodeid=18652742&forcedownload=true
http://www.sea.siemens.com/sitrain/wbt/wbt.asp
http://www.automation.siemens.com/fea/html_76/down_module.htm
Thank you 100000 times and many many more
It would help me a lot.