TU890 3BSC690075R1 ABB Termination Module

The TU890 serves as the physical interface between the field wiring and the DI890 module. It's a "pluggable" unit that field cables connect to, simplifying installation and maintenance. Crucially, the TU890 enables hot-swapping of the DI890 module. This means the digital input module can be replaced without powering down the entire system or affecting ongoing operations, which is vital for continuous processes where downtime is costly. It also provides the necessary current limiting, fusing, and surge protection for the input signals, further contributing to the overall system's robustness and long-term reliability.

Field Wiring Interface: Its primary role is to provide a clean and organized interface for connecting field devices directly to the I/O system.

Hot-Swap Capability (with compatible modules): A standout feature of the TU890 is its ability to enable hot-swapping of the associated I/O module . 

Module Retention: The termination unit securely holds the I/O module in place, ensuring a stable and reliable electrical connection within the system.

Terminal Block Design: It typically features robust terminal blocks for easy and secure connection of field wires, often labeled for clear identification.

Direct Mechanical and Electrical Connection: It provides the mechanical mounting and electrical connection points for the DI890 module to the module bus, ensuring seamless data transfer and power distribution.