ABB TU841 3BSE020848R1
1. Overview
The ABB TU841 is a Module Terminal Unit (MTU) specifically designed for the redundant configuration of the Optical ModuleBus modem TB840/TB840A, and it is suitable for non-redundant I/O environments. As a passive device, this unit provides power input, a single electrical ModuleBus, and two TB840 interfaces, enabling reliable signal distribution and terminal protection.
2. Key Specifications
- Model: TU841 (3BSE020848R1)
- Weight: Approximately 0.4 kg
- Protection Class: IP55 / IP66 (dustproof and waterproof)
- Power Supply: 24 V DC
- Interfaces: Two TB840/TB840A Optical ModuleBus interfaces supporting redundant configuration; one single electrical ModuleBus terminal
- Mechanical Structure: Compact housing equipped with four mechanical keys (two keys per position), each with six contacts, for configuring the matching between the MTU and corresponding modules
- Applicable Voltage: 50 V application range (compatible with the ABB Compact product series)
3. Product Features
- Redundancy Support: Tailored for the redundant configuration of TB840/TB840A, enhancing system reliability.
- Passive Unit: No internal power supply required, reducing power consumption and simplifying wiring.
- High Protection Class: IP55/IP66 rating ensures adaptability to harsh industrial environments.
- Modular Configuration: Quick setting of corresponding module types via mechanical keys, facilitating on-site fast wiring and maintenance.
- Compact Structure: Small footprint, easy to install in densely packed control cabinets.
4. Structure and Components
- Housing: Metal enclosure with electrolytic surface treatment for corrosion resistance.
- Power Terminal Block: 24 V DC power input interface (for powering the entire system).
- Optical ModuleBus Terminals: Two TB840/TB840A interfaces for redundant transmission of fiber optic signals.
- Single Electrical ModuleBus Terminal: Provides electrical connection with on-site I/O modules.
- Mechanical Keys: Four key positions (two keys per position), each with six contacts, for setting the matching relationship between the MTU and modules.
5. Typical Application Fields
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- Process Automation Control Systems (DCS)
- Distributed I/O Networks (e.g., S800 series I/O communication interfaces)
- Redundant Fiber Optic ModuleBus systems, especially in industrial sites requiring high reliability (such as petrochemical, energy, and manufacturing industries)
- Bridging between PLCs and fieldbuses, realizing seamless integration of fiber optic buses and traditional I/O
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