{"When" | "While" | "Considering" the landscape of industrial "control systems" , four "giants" – Siemens, Allen-Bradley (now Rockwell Automation), ABB, and Schneider Electric – "commonly" surface. Siemens https://alen-bradley047995.wikitelevisions.com/10039948/siemens_allen_bradley_abb_and_schneider_a_comparison