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Phone: +86 16626708626Description
The ABB TU846 is a robust and adaptable Module Termination Unit (MTU) designed specifically for use with ABB’s CI840 and CI840A field communication interfaces, intended primarily for redundant I/O system configurations. This passive module plays a crucial role in industrial automation, particularly in complex control systems used in process industries like oil and gas, power generation, and manufacturing, where system reliability and fault tolerance are critical. The ABB TU846 supports split responsibility architectures by managing multiple redundant communication and power pathways, significantly enhancing system availability and preventing single point failures.
This MTU includes support for dual electrical ModuleBuses and optional fiber optic connections through TB842 and TB846 adapters for extended network reach and noise immunity. Engineers value the ABB TU846 for its dual rotary switches that allow precise station addressing from 0 to 99, accommodating large distributed control networks with ease. Its mechanical keying system offers up to 36 configuration options, ensuring correct module installation and reducing maintenance errors. The unit’s design incorporates a secure latching device for DIN rail mounting and ensures grounding consistency for safety and interference resistance.
- TU846
- TU846
Major advantages of the ABB TU846 include seamless integration within ABB’s S800 I/O and System 800xA platforms, enabling scalable, reliable modular I/O architecture in highly automated plant environments. Its robust, compact form (124 mm wide, 47 mm deep, 186 mm tall) and lightweight (around 0.5kg) make it easy to fit into control cabinets with minimal space requirements. The dual bus support and redundancy features help system integrators achieve continuous operation and simplified fault management in mission-critical industrial control scenarios.
| Parameter | Value |
|---|---|
| Model | ABB TU846 (3BSE022460R1) |
| Brand | ABB |
| Product Type | Module Termination Unit |
| Supported System | CI840/CI840A for redundant I/O systems |
| Communication Interface | Dual electrical ModuleBus, optional optical ModuleBus via adapters |
| Station Address Range | 0–99 (two rotary switches) |
| Mechanical Keying Configurations | 36 configurations |
| Mounting | DIN rail with latching device |
| Dimensions (WxHxD) | 124 mm × 186 mm × 47 mm |
| Weight | Approx. 0.5 kg |
| Operating Temperature | 0°C to +55°C typical |
| Environmental Rating | IP20 |
| Certifications | CE, UL, IEC standards |
Related and compatible modules include ABB CI840/CI840A (communication interface modules), ABB TB842 (optical port adapters), ABB TB846 (fiber optic adapters for ModuleBus systems), as well as a variety of S800 I/O modules designed to work in redundant configurations.
For installation, ensure proper DIN rail mounting with firm securement to maintain electrical grounding and mechanical stability. Allow adequate clearance around the module for ventilation and accessibility during maintenance. Verify mechanical key settings and station addressing prior to powering the system to avoid communication conflicts. Routine maintenance should include inspection of module bus connections, lubrication of latching mechanisms if applicable, and verification of module configuration settings per system documentation.
