ABB TU846 3BSE022460R1 Redundant I/O Module Termination Unit

Description

The TU846 3BSE022460R1 provides a reliable mounting platform for two Communication Interface modules, enabling a fully redundant ModuleBus setup. It acts as a passive hub, distributing power and internal bus signals, with two independent 24V DC power feeds for the modules. With no active components, the TU846 offers high reliability and long service life. It features mechanical keying to prevent incorrect module insertion and integrated terminals for easy DIN rail installation, making it ideal for fault-tolerant I/O communication in distributed control systems.

Specifications

• Manufacturer: ABB

• Model Number: TU846 (3BSE022460R1)

• Product Type: Redundant Module Termination Unit (MTU)

• Supported Modules: Dual CI810, CI820, or CI840 Interfaces

• Input Voltage: 24 V DC (Redundant dual inputs)

• Maximum Current: 5 A

• Backplane Type: Redundant ModuleBus

• Mounting Type: 35mm DIN Rail

• Protection Class: IP20

• Operating Temperature: -25 to +70 °C

• Weight: 0.54 kg

Features

• High-Availability Design: Accommodates two communication modules simultaneously to support automatic failover and eliminate communication downtime.

• Dual Power Feed Support: Equipped with separate terminal blocks for redundant power sources, ensuring the cluster remains energized during a power supply fault.

• Hot-Swap Functionality: Allows for the replacement of a faulty communication module without interrupting the operation of the redundant partner or the I/O cluster.

• Passive Circuitry: Uses a hardware-only design with no active electronics on the base unit, maximizing the Mean Time Between Failures (MTBF).

• Safe Configuration Keying: Features physical coding to ensure only compatible module types can be installed, protecting hardware from electrical damage.

• Vibration-Resistant Housing: Compact and durable construction designed for long-term stability in harsh industrial cabinet environments.