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ABB  TU890 3BSC690075R1

The ABB TU890 3BSC690075R1 is a compact Module Termination Unit (MTU) for ABB’s S800 I/O system, specifically designed for intrinsic safety (IS/Ex) applications. It provides the interface between field wiring, process power, the I/O module, and the S800 ModuleBus. 

Core Functions

• Provides field wiring and process power connections for S800 I/O modules.
• Distributes the ModuleBus to the installed I/O module and onward to the next MTU.
• Generates the appropriate module address through position-signal shifting.
• Provides mechanical keying to prevent installation of an incompatible I/O module.
• Supports compact installation on a DIN rail. 

Design Features

The TU890 uses a terminal-block connection with 27 blue terminals and supports 8 I/O channels. It is intended for single I/O configurations and has a nominal 24 V system specification. ABB specifies a maximum rated voltage of 50 V and a maximum current of 2 A per I/O channel, subject to the limitations of the connected I/O module and its certification. 

Hardware Composition

Typical Applications

The TU890 is compatible with ABB S800 I/O modules including AI890, AI893, AI895, AO890, AO895, DI890, and DO890. It is particularly suitable where intrinsic-safety interfaces are required for field devices in hazardous-area process applications. 

For example, ABB specifies the TU890 as a matching MTU for the DO890 digital output module, while the AO890 analog output module can also use the TU890 for two-wire process connections in Ex applications. 

Maintenance Considerations

Before replacement, verify the 3BSC690075R1 article number and confirm that the connected I/O module is one of the TU890-compatible models. Check terminal wiring, ModuleBus connections, mechanical keying, and DIN-rail locking during installation. In hazardous-area applications, replacement should also follow the applicable Ex/Intrinsic Safety installation requirements.

Overall Evaluation

The ABB TU890 3BSC690075R1 is a compact S800 I/O termination unit designed to simplify field wiring and provide an intrinsic-safety interface for compatible ABB I/O modules. Its compact DIN-rail design, integrated ModuleBus connection, mechanical keying, and support for multiple S800 Ex I/O modules make it suitable for distributed process-control and hazardous-area instrumentation systems.