ABB TB845 3BSE021437R1 Modulebus Cable Adaptor

Product Overview

The TB845 (3BSE021437R1) is a high-reliability cable adaptor designed for the S800 I/O system's redundant Modulebus architecture. This unit allows engineers to extend the electrical Modulebus across multiple DIN rails, ensuring that redundant communication paths remain synchronized and protected. Functioning in tandem with the TB846 and dual TK801Vxxx cables, the TB845 provides a robust bridging solution for distributed I/O stations where high availability and fault tolerance are paramount.

Technical Specifications

• Brand ABB

• Series S800 I/O

• Model Designation TB845

• Part Number 3BSE021437R1

• Functional Category Redundant Modulebus Cable Adaptor

• System Redundancy Dual-path communication support

• Environmental Protection G3 conformal coating (ISA-S71.04)

• Operating Temperature 0 to +55°C (Storage: -25 to +70°C)

• Electrical Safety IEC 61131-2, UL 61010-1/2-201

• Hazardous Location Ratings ATEX Zone 2, C1 Div 2 cULus

• Marine Approvals ABS, BV, DNV, LR

• Protection Class IP20 (IEC 60529)

• Humidity 5 to 95% non-condensing

• Pollution Degree Degree 2 (IEC 60664-1)

• Width 43 mm

• Height 186 mm

• Depth 31.5 mm

• Weight 180 g

Engineering Insights and Operational Logic

The TB845 (3BSE021437R1) acts as the distribution hub for redundant Modulebus signals. In a high-availability S800 station, maintaining the "same electrical bus" across physical gaps is a challenge; this adaptor solves that by splitting or extending the signals through dedicated redundant ports. It is specifically built for mission-critical sectors like offshore oil platforms and chemical processing, featuring G3 corrosion protection and extensive marine certifications. The hardware ensures that the I/O modules on secondary rails receive consistent timing and data packets from both the primary and backup bus controllers simultaneously.