If you have questions about our products, Fill out the form below and we will answer any questions you have. Tips: Fields marked with*are required. Yokogawa EB401-10 S1 ER Bus Interface Master Module Introduction The Yokogawa EB401-10 S1 ER Bus Interface Master Module is a robust communication interface designed for distributed control systems (DCS). Acting as the ER bus master, it coordinates communication between CPU modules and field *Your Name: *Your Email: *Your Name: *Vdcode: Submit