ABB TU843 3BSE021443R1 S800 I/O Redundant Module Termination Unit

Description

The TU843 3BSE021443R1 is a passive interface that integrates two redundant ModuleBus communication paths, eliminating single points of failure between field I/O and the AC 800M controller. It features dedicated terminal points for dual 24V DC power inputs, ensuring power redundancy alongside data redundancy. With no active electronics, the TU843 maintains system reliability. Its rugged, DIN-rail mountable housing includes mechanical keying to prevent incorrect module installation, making it ideal for high-density DCS environments requiring process continuity and fault tolerance.

Specifications

• Manufacturer: ABB

• Model Number: TU843 (3BSE021443R1)

• Product Type: Redundant Module Termination Unit

• Module Support: Dual CI810 or CI820 Interfaces

• Maximum Rated Voltage: 30 V DC

• Maximum Rated Current: 5 A

• Connection Logic: Redundant ModuleBus

• Mounting Method: 35mm DIN Rail

• Protection Class: IP20

• Operating Temperature: -25 to +70 °C

• Weight: 0.53 kg

Features

• Redundancy-Ready Design: Specifically engineered to support two communication modules, enabling seamless failover and high system availability.

• Dual Power Input Terminals: Accommodates two independent power sources to provide redundant electrical supply to the I/O cluster.

• Zero-Downtime Maintenance: Supports the hot-swapping of communication interfaces, allowing for module replacement while the control system remains live.

• Passive Reliability: The hardware-centric backplane design ensures a high Mean Time Between Failures (MTBF) by removing active electronic failure points.

• Secure Mechanical Keying: Includes physical coding pins to ensure that only compatible hardware can be seated, preventing damage from electrical mismatch.

• Compact Cabinet Routing: Consolidates redundant bus routing and power distribution into a single, space-efficient DIN rail unit.