The Telemecanique® Uni-Telway bus is a standard means of communication between control system components, including PLCs, MMI terminals, supervisors, variable speed drives, numerical controllers, weighing equipment, and more. It is suitable for architectures designed to pilot control and monitoring devices via a PLC, or architectures used for man machine interface, or MMI (supervision, etc).

The Uni-Telway bus requires a master station which manages the allocation of bus access rights to the various connected stations (known as slave stations). In addition, some slave-to-slave communication is possible.