ABB TB845 3BSE021437R1 S800 I/O Redundant Dual Modulebus Outlet

Product Overview

The ABB TB845 (3BSE021437R1) serves as the high-availability exit point for the S800 I/O Modulebus. Unlike standard single outlets, the TB845 features two female D-sub connectors to support redundant communication architectures. It enables the connection of two separate TK801 extension cables, effectively eliminating single points of failure in the bus segment. This unit ensures that a failure in one extension cable or connector does not compromise the data integrity of the subsequent I/O clusters. We supply this component as 100% Brand New and Original, manufactured in Sweden to meet the strictest industrial quality standards.

Technical Specifications

The TB845 provides a robust mechanical and electrical interface for redundant bus topologies:

• Product ID: 3BSE021437R1

• Model: TB845

• Product Type: Module Termination Unit (Dual Outlet)

• Connectivity: 2 x D-sub 25-pin, Female

• Redundancy Support: Dual TK801 Cable Interface

• Net Width: 43 mm

• Net Height: 186 mm

• Net Depth: 31.5 mm

• Net Weight: 0.18 kg

• Country of Origin: Sweden

• Compliance: RoHS (EU Directive 2011/65/EU), WEEE Category 5

Engineering Advantages

• Fault-Tolerant Bus Expansion: The TB845 facilitates a redundant Modulebus topology. By providing two physical ports for two TK801 cables, the system maintains full communication with downstream I/O clusters even if one cable sustains mechanical damage or electrical interference.

• Integrated Path Redundancy: The internal logic of the TB845 splits the Modulebus signals into two parallel paths. This design allows the AC 800M controller or communication interface to detect and switch between data lines seamlessly, ensuring zero-latency failover during operation.

• Industrial-Grade Shielding: The D-sub female connectors utilize high-quality metallic shielding to minimize electromagnetic interference (EMI). This protection remains critical when routing extension cables near high-power motors or variable frequency drives (VFDs) that generate significant noise.

• Standardized D-sub Interface: The use of standard D-sub 25 connectors simplifies maintenance. Technicians secure the TK801 cables using integrated thumb screws, preventing accidental disconnections caused by vibration or mechanical stress in industrial control rooms.

• Space-Efficient Vertical Profile: Despite its dual-port capability, the 43mm width maximizes DIN rail density. The vertical height aligns perfectly with S800 I/O clusters, providing a clean and organized cable exit path for complex, multi-rail cabinet layouts.

FAQs

• When must I use a TB845 instead of a standard TB805?

  You select the TB845 when your system architecture requires redundancy. If you utilize redundant communication interfaces (like CI840A) and want to extend that redundancy across separate DIN rails via dual TK801 cables, the TB845 is the mandatory outlet adaptor.

• Can I use the TB845 with a single TK801 cable?

  Yes, the TB845 functions with a single cable, but the system will not provide communication redundancy. The controller will flag a "redundancy lost" warning, though data transmission will continue through the single active cable.

• Does this unit require an external power supply?

  No. The TB845 is a passive termination unit that derives the necessary signal reference from the Modulebus backplane. It requires no external 24V DC or 5V DC power inputs to function.

• What is the recommended installation location?

  Install the TB845 at the far right-hand side of the I/O cluster where the bus needs to "exit" and move to the next rail. Ensure you have sufficient clearance for the bend radius of the two TK801 cables connected to the D-sub ports.