Quite a few firms , including ABB , Electrical Siemens, Endress+Hauser , and Emerson , represent the process automation sector . ABB specializes in power & automation and motion control , while Siemens https://travialist.com/story12415846/abb-versus-electrical-siemens-versus-e-h-versus-emerson-a-look-at-leading-automation-firms