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 SB401-50 S1 ESB Bus Interface Slave Module Introduction The Yokogawa SB401‑50 S1 ESB Bus Interface Slave Module is a specialized communication component engineered to function as a slave node on the Extended System Bus (ESB) within Yokogawa distributed control and automation inf *Your Name: *Your Email: *Your Name: *Vdcode: Submit