TU846 High-Density Module Termination Unit (MTU)

Description

TU846

The ABB TU846 is a high-performance Module Termination Unit (MTU) within ABB’s S800 I/O system, engineered to handle both analog and digital signals with enhanced flexibility. Its core function is to distribute power and communication across the I/O chain, supporting up to 24 channels to accommodate larger signal volumes than standard termination units. The unit features advanced signal conditioning capabilities, reducing noise interference that can compromise measurement accuracy in sensitive applications.

TU846

Positioned between field devices and the S800 I/O modules, the ABB TU846 acts as a critical interface in the automation stack. It incorporates mechanical coding to prevent incorrect module insertion, safeguarding against installation errors that could disrupt system operation. Mounted on a standard DIN rail with secure grounding latching, it integrates seamlessly into existing control cabinets while maintaining compliance with industrial safety standards. The TU846 communicates via the S800 backplane, ensuring compatibility with ABB’s controllers and enabling real-time data exchange across the automation network.

TU846

Main features and advantages:

Choosing the ABB TU846 delivers tangible operational advantages in demanding industrial environments. Its high-density 24-channel design reduces the number of termination units required, optimizing cabinet space and simplifying wiring layouts—directly lowering installation costs and reducing clutter that can hinder maintenance access. Engineered for rugged reliability, the TU846 operates consistently across extreme temperature ranges, making it suitable for both indoor control rooms and harsh field environments.

The unit’s advanced signal conditioning minimizes measurement drift, ensuring long-term accuracy in critical applications like chemical dosing or pressure monitoring. Maintenance teams benefit from its intuitive design: clear labeling and status indicators enable quick identification of connection issues, while tool-less terminal blocks speed up wiring adjustments during system upgrades. By integrating seamlessly with the S800 ecosystem, the ABB TU846 reduces engineering overhead, allowing teams to focus on optimizing processes rather than troubleshooting compatibility issues.

TU846

Application areas:

The ABB TU846 excels in industries requiring high-channel density and signal versatility. In oil refineries, it connects pressure, temperature, and flow sensors across distillation units, where accurate real-time data is vital for maintaining process efficiency and safety. Its noise-resistant design ensures reliable performance even in electrically noisy environments common in petrochemical facilities.

In food and beverage manufacturing, the TU846 manages signals from hygiene sensors, level detectors, and valve actuators, supporting compliance with strict quality standards through consistent data collection. Water treatment plants leverage its 24-channel capacity to monitor pH levels, turbidity, and pump statuses across multiple treatment stages, ensuring regulatory compliance and efficient resource utilization. In all these applications, the ABB TU846 delivers the signal integrity and scalability needed to support dynamic industrial processes.

Related products:

ABB TU838 – Compact 16-channel termination unit ideal for smaller-scale applications with lower signal volumes.

ABB S800 I/O AI835 – High-precision analog input module paired with TU846 for advanced process measurement.

ABB S800 I/O DI810 – Digital input module compatible with TU846 for monitoring discrete sensors and switches.

ABB TU840 – Explosion-proof termination unit for hazardous areas requiring ATEX/IECEx certification.

ABB AC500-eCo PLC – Compact controller that integrates seamlessly with TU846 for distributed automation systems.

ABB S800 I/O PS860 – Redundant power supply module ensuring uninterrupted operation for TU846 and connected I/O.

ABB CI854 – Profibus DP-V1 communication interface enabling TU846 integration with third-party devices.

Installation and maintenance:

Before installing the ABB TU846, verify compatibility with existing S800 I/O modules and controller firmware to ensure seamless communication. Confirm the DIN rail is properly grounded and rated to support the unit’s weight when fully wired. Check that the control cabinet provides adequate ventilation, as the TU846’s high-density design generates moderate heat during operation. Inspect terminal blocks for debris and ensure wiring matches the specified gauge and stripping length to prevent connection failures.

For ongoing maintenance, periodically inspect terminal connections for corrosion or looseness, particularly in humid environments. Use the status LEDs to quickly diagnose signal or power issues without disconnecting wiring. Calibrate connected analog sensors annually, using the TU846’s signal conditioning as a reference point. Every two years, perform a dielectric strength test to verify insulation integrity, ensuring continued compliance with safety standards. Keep firmware updated via ABB’s engineering software to access the latest diagnostic features.

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