ABB TU841 3BSE020848R1

1. Overview

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

• 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