ABB TB805 3BSE008534R1 Modulebus Extension Adaptor

Product Overview

The TB805 (3BSE008534R1) serves as a specialized Modulebus outlet designed for the ABB S800 I/O system architecture. It facilitates physical bus extension between separate I/O clusters, providing a reliable interface for D-sub connectivity. This termination unit is critical for maintaining high-speed signal integrity when distributing I/O modules across multiple DIN rails or separate enclosures within a DCS environment.

Technical Specifications

• Brand ABB

• Series S800 I/O

• Model Designation TB805

• Part Number 3BSE008534R1

• Functional Category Modulebus Extension Adaptor / Termination Unit

• Interface Hardware D-sub 25-pin, Female

• Bus Compatibility Modulebus (Internal and Extended)

• Connectivity Requirement One unit per TK801 extension cable

• Mounting Configuration Attaches to the right-hand side of the I/O station

• Input Voltage Compatibility Passive (Signal routing only)

• Pollution Degree Degree 2 (IEC 61131-2)

• Protection Class IP20

• Width 22 mm

• Height 109 mm

• Depth 25 mm

• Weight 0.046 kg

• RoHS Compliance Directive 2011/65/EU

Engineering Insights and Operational Logic

In complex automation topologies, the TB805 (3BSE008534R1) functions as the gateway for the Modulebus signal to exit the local rail. By utilizing a female D-sub 25 connector, it pairs specifically with the TK801 cable to bridge data flow to a secondary I/O cluster. This allows engineers to expand the I/O count beyond a single DIN rail while treating the remote modules as part of the same logical station. The hardware is designed for low-impedance signal paths to prevent data packet loss during high-speed communication cycles typical of ABB 800xA systems.