3BSE022460R1 ABB TU846 Dual Communication Interface MTU

Product Overview

The ABB TU846 (3BSE022460R1) functions as a high-availability Module Termination Unit (MTU) designed to host redundant communication interfaces within the S800 I/O ecosystem. This specific MTU facilitates a 1+1 configuration for CI840 or CI840A PROFIBUS fieldbus communication interfaces, ensuring that the I/O system maintains continuous operation even if one communication module fails. It bridges the gap between field-level S800 I/O modules and the AC 800M controller by providing stable power distribution and redundant signal pathways. We supply this unit as 100% brand new and original in factory-sealed packaging, meeting the rigorous standards of mission-critical process industries.

Technical Specifications

Engineering Advantages

The TU846 3BSE022460R1 provides the mechanical and electrical foundation for zero-downtime industrial networks:

• Fault-Tolerant Architecture: The dual-slot design hosts two CI840/CI840A modules in a 1+1 redundant configuration. If the primary module encounters an error, the system seamlessly switches to the standby unit without interrupting the PROFIBUS signal or process control.

• Integrated Communication Ports: The unit features a dedicated DSUB9 connector for PROFIBUS connectivity and RJ45 service ports. This eliminates the need for external T-junctions or messy cabling, as the bus termination and signal splitting occur within the MTU base.

• Versatile Orientation: The TU846 supports both horizontal and vertical DIN rail mounting. This flexibility allows engineers to optimize airflow and cabinet space, particularly in high-density distributed control racks.

• Reliable Power Distribution: The MTU manages 24V DC input and distributes it across both communication interfaces. The robust 50V insulation rating protects the I/O bus from common-mode voltage spikes and electrical noise.

• Hot-Swap Capability: Because the field wiring and PROFIBUS cables connect directly to the TU846 baseplate, maintenance teams can replace communication modules while the system remains live. This reduces Mean Time To Repair (MTTR) and prevents process shutdowns.

FAQs

• Does the TU846 come with the CI840 modules included?

  No. The TU846 is a passive termination unit only. It provides the slots and wiring terminals for the CI840 or CI840A modules, which must be purchased separately.

• What is the maximum operating temperature for the TU846?

  The unit supports up to 55°C (131°F) when mounted horizontally. If your cabinet layout requires vertical mounting, the operating limit is 40°C (104°F) to ensure proper heat dissipation.

• Is the 3BSE022460R1 a new or refurbished unit?

  We only supply 100% brand new, original ABB hardware. Each TU846 arrives in its original factory packaging with a full 12-month manufacturer warranty.

• Can I use this MTU for non-redundant applications?

  While the TU846 is specifically designed for redundancy, it can operate with a single CI840 module. However, for non-redundant systems, the compact single-slot MTUs are generally more space-efficient.