Several companies , including ABB , Siemens , E+H, and Emerson , dominate the process automation sector . ABB is known for power & automation and drives , while Siemens delivers a comprehensive portfolio https://macrobookmarks.com/story22100051/asea-brown-boveri-versus-siemens-versus-e-h-versus-emerson-electric-a-look-at-industrial-automation-giants