3BSE022462R1 ABB S800 Modulebus Termination Block

Product Overview

The ABB TU847 (product ID 3BSE022462R1) is a high-density, 100% brand new original Module Termination Unit (MTU) designed for the S800 I/O system platform. This critical baseplate component provides the structural anchoring, electrical backplane links, and field wiring infrastructure for dual, redundant CI840 or CI840A PROFIBUS communication interface modules while connecting them to a single, non-redundant S800 I/O module rack. By separating the fragile electronic processing components from the physical field terminations, this unit allows process plants to implement robust upstream network redundancy without inflating the overall footprint or cost of downstream I/O hardware.

Technical Specifications

The mechanical and electrical architecture routes high-speed data bus paths and field voltage distribution lines natively across the backplane structure. All technical specifications utilize standard ASCII text formatting:

• Product Identification Number: 3BSE022462R1

• Hardware Model Nomenclature: TU847

• Primary Function: Redundant Module Termination Unit (MTU) baseplate

• Supported Module Configuration: 1+1 redundant CI840 / CI840A communication interfaces paired with a single I/O cluster line

• Main Power Supply Input: 24 V DC (operational voltage window spanning 19.2 to 30 V DC)

• Physical Communications Connectors: 1 x DSUB9 port for PROFIBUS networks / 1 x RJ45 socket for dedicated service tool access

• Rated Insulation Voltage Limit: 50 V

• Enclosure Protection Rating: IP20 safety class according to EN60529 and IEC 529 standards

• Horizontal Mounting Maximum Temperature: +55 degrees Celsius (+131 degrees Fahrenheit)

• Vertical Mounting Maximum Temperature: +40 degrees Celsius (+104 degrees Fahrenheit)

• Ambient Thermal Operating Window: 0 to +55 degrees Celsius

• Long-term Thermal Storage Limits: -40 to +70 degrees Celsius

• Relative Humidity Working Range: 5% to 95% non-condensing

• Product Net Depth / Length: 47 mm

• Product Net Height: 186 mm

• Product Net Width: 124 mm

• Net Base Hardware Weight: 0.55 kg

• Total Shipping Weight Allocation: 1.5 to 2.0 kg

• Standard Industrial Mounting: 35mm top-hat DIN-rail profiles

• Hazardous Environment Certifications: CE marked, UL listed, CSA approved, ATEX Zone 2 explosive atmosphere certified, IECEx compliant

Engineering Advantages

The TU847 3BSE022462R1 addresses crucial physical, electrical, and regulatory installation issues in highly demanding continuous-process plants:

• Enables Live Hot-Swapping of Communication Nodes: A network module failure on a standard single-slot base plate crashes the entire downstream I/O link during maintenance. The dual-slot layout of the TU847 allows instrumentation technicians to unplug a faulty CI840 interface module while the secondary redundant module takes over the plant communication traffic instantly, avoiding process trip conditions during hot replacements.

• Reduces Costly Field Termination Errors: Wiring hundreds of industrial field lines directly into electronic module housings risks pinching cables and cracking circuit card pins. The TU847 houses rugged, permanent screw terminal clamps directly on the stationary base, allowing contractors to complete and test all field terminations before snapping the delicate processor modules into position.

• Guarantees Safety Compliance in Hazardous Environments: Petrochemical plants and gas compression platforms require specialized spark-containment infrastructure to prevent explosions. The TU847 carries full ATEX Zone 2 and IECEx compliance ratings, making it field-certified for installation inside remote, low-ventilation enclosures positioned near active process areas without extra flameproof enclosures.

• Adapts to Restrictive Cabinet Dimensions: Crowded marshalling cabinets limit wiring pathways and mounting configurations. The TU847 supports both horizontal orientation (maximizing convective cooling up to +55 degrees Celsius) and vertical orientation. This flexibility allows layout engineers to flip the baseplate configuration to fit narrow wiring ducts and tight side-wall panels.

FAQs

• Q: Is this ABB TU847 3BSE022462R1 unit supplied in factory-new condition?A: Yes. We supply this product strictly as a 100% brand new, original factory component. It arrives sealed inside its authentic original factory packing, carrying a full 12-month factory warranty to meet strict power utility procurement guidelines.

• Q: Can this specific module termination unit operate as a standalone device?A: No. The TU847 serves purely as a mechanical and electrical baseline. It provides no independent processing logic and must be paired with active ABB S800 I/O components (such as a redundant pair of CI840 or CI840A modules) to establish actual communication loops.

• Q: What is the primary operational difference between the TU847 and alternative models like the TU830?A: The TU847 integrates a dual-socket backplane layout specifically designed to host redundant (1+1) CI840 communication modules alongside standard DSUB9 PROFIBUS network connections. Alternative termination blocks like the TU830 handle entirely different high-density single-channel analog or digital I/O card architectures.

• Q: Why does the maximum operating temperature drop from +55 to +40 degrees Celsius when mounted vertically?A: Mounting the unit vertically alters the natural upward convection path of heat dissipating away from internal terminal contacts and module electronics. To prevent thermal hotspots inside the components, you must derate the maximum permitted ambient enclosure temperature to +40 degrees Celsius in vertical configurations.