Several entities, including ABB , Siemens , Endress+Hauser , and Emerson Electric, lead the factory automation landscape . ASEA Brown Boveri specializes in power & automation and drives , while Siemens https://ledbookmark.com/story7776859/asea-brown-boveri-versus-siemens-versus-endress-hauser-versus-emerson-electric-a-comparison-at-leading-automation-firms