Description

The TU807 (Part Number: 3BSE020846R1) is a specialized Base Unit / Termination Module manufactured by ABB. It serves as the critical interface between the TB840 or TB840A ModuleBus Modem and the electrical side of the I/O (Input/Output) chain. Specifically designed for non-redundant configurations, the TU807 provides the necessary electrical termination and power distribution to support up to 12 single I/O modules in a cluster. It acts as the physical foundation that connects the fiber-optic communication backbone to the electrical control circuitry.

Application Scenarios

Consider a scenario in a water treatment plant where a central control room needs to manage a series of pump stations. The TB840A optical modem is installed in the control cabinet, converting electrical signals to optical for transmission over long distances to remote pump stations. At the control end, the TU807 is mounted directly below the TB840A. It terminates the electrical ModuleBus, providing the 24VDC protected power required by the I/O modules. This setup allows the control system to manage up to 12 non-redundant analog inputs monitoring water levels and flow rates, all while maintaining a clean, organized, and reliable electrical connection.