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. ABB TB845 3BSE021437R1 Extension I/O Module Introduction The ABB TB845 Extension I/O Module is designed to expand the reach and flexibility of modular control systems by enabling additional I/O capacity without redesigning the core architecture. Acting as an extension interface, it a *Your Name: *Your Email: *Your Name: *Vdcode: Submit