prosoft technology, inc. - communications solutions - indust
www: http://www.prosoft-technology.com

i. sie ć profibus                                                               
www: http://209.85.129.104/search?q=cache:_QTQpf6016IJ:www.ee.pw.edu.pl

procentec - profibus and profinet center - troubleshooting,
www: http://www.procentec.com

samson ag mess- und regeltechnik, frankfurt, homepage in
www: http://www.samson.de

profibus system description                                          
www: http://209.85.129.104/search?q=cache:sKuUescMSJIJ:www.profibus.com