Overview

The ABB TU891 MTU (Module Termination Unit) is part of the S800 I/O family, designed for use in ABB’s System 800xA distributed control system (DCS). It serves as the termination interface between field signals and I/O modules, ensuring signal integrity and simplifying maintenance.

• Non-IS Design: Suitable for standard industrial environments (not intrinsically safe).

• 3 × 9 Signal Terminals: Compact, efficient wiring for field devices.

• Plug-in Installation: Simplifies integration with ABB’s S800 I/O modules.

• Electrical Protection: Ensures stable communication for connected signals.

This termination unit is essential for connecting field devices to ABB’s modular I/O system, and it plays a crucial role in process automation, power generation, and manufacturing industries.

Technical Data

Typical Applications

• Process automation systems requiring reliable signal termination for field devices.

• Power generation plants where stable I/O connections are critical for turbine and boiler control.

• Chemical and petrochemical industries needing robust wiring solutions in non-IS (non-intrinsically safe) environments.

• Manufacturing automation where compact MTUs simplify wiring and reduce downtime.

Example: In a refinery automation system, the TU891 ensures secure termination for multiple sensor signals, providing accurate data transfer to the control system.

FAQ

Q1: What is the primary function of the TU891?

A1: It terminates field signals for ABB S800 I/O modules in non-intrinsically safe applications.

Q2: How many signal terminals does it support?

A2: It provides termination for 3 × 9 signal terminals.

Q3: Is it compatible with intrinsically safe environments?

A3: No, the TU891 is designed for non-IS applications only.

Q4: How is it installed?

A4: It is DIN-rail or rack-mounted as a plug-in module, simplifying installation and replacement.

Q5: Which industries typically use this unit?

A5: Power generation, petrochemical refining, chemical processing, and heavy manufacturing sectors.