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ABB TU841 3BSE020848R1 Module Terminal Unit
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
- 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
6. Installation and Maintenance Guidelines
- Pre-installation Inspection: Confirm that the 24 V DC power supply is properly connected and check the cleanliness of fiber optic ports.
- Mechanical Key Configuration: According to the type of modules used, complete the configuration with the corresponding combination of mechanical keys (six contacts per key) to ensure the key positions match the modules.
- Wiring: Connect the power supply, Optical ModuleBus, and single electrical ModuleBus in accordance with the wiring diagram, taking care to prevent incorrect connection.
- Protection: In humid or dusty environments, ensure the housing is well-sealed to meet the IP55/IP66 requirements.
- Regular Inspection: Check the locking status of mechanical keys, the quality of fiber optic connections, and the integrity of housing protection every 6–12 months.
- Replacement: As a passive unit, the TU841 itself does not require replacement of power components; if terminal corrosion or mechanical key damage occurs, the entire unit can be directly replaced.
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PLC, DCS, CPU modules, communication modules, input/output modules (AI/AO/DI/DO), power supply modules, thyristor modules, terminal modules, PXI modules, servo drives, servo motors, industrial displays, industrial keyboards, controllers, encoders, regulators, sensors, I/O boards, counting boards, fiber optic interface boards, acquisition cards, gas turbine cards, FIM cards and other automation spare parts.
Company Advantages & Services
- With years of experience in the industrial control industry, we maintain a large inventory of products.
- We stand at the industry forefront, offering competitive pricing and reliable quality assurance.
- Our product range covers diverse models and specifications, including rare and discontinued items.
- Free replacement is available within 15 days if quality issues arise.
Our modules, cards, drives, controllers, servo motors, embedded cards, wires, cables, power modules and control modules are widely applied in industries such as steel, hydropower, nuclear power, power generation, glass manufacturing, tire production, rubber processing, thermal power, papermaking, shipping and navigation.
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