ABB TB842 3BSE022464R1 Optical ModuleBus Port1

Product Overview

The TB842 (3BSE022464R1) is a high-speed fiber optic communication interface designed for the ABB S800 I/O system. It serves as the primary gateway between Field Communications Interfaces (FCI) like the CI801 or CI840/A and remote I/O clusters or ABB drives. By converting electrical ModuleBus signals into optical pulses, the TB842 enables long-distance data transmission while providing total electrical isolation and immunity to electromagnetic interference (EMI) in complex industrial environments.

Technical Specifications

• Brand: ABB

• Series: S800 I/O

• Model Name: TB842

• Part Number: 3BSE022464R1

• Protocol: ModuleBus (Optical)

• Data Rate: Up to 10 Mbit/s

• Wavelength: 650 nm

• Connector Type: Agilent Versatile Link (formerly Hewlett-Packard)

• Fiber Compatibility: Plastic Optical Fiber (POF) or Hard Clad Silica (HCS)

• Redundancy Support: Line and Module Redundancy supported

• Hot Swap: Yes

• Current Consumption (24V): 20 mA (typical)

• Power Dissipation: 0.5 W

• Mounting Orientation: Vertical or Horizontal

• Hazardous Ratings: ATEX Zone 2, cULus Class 1 Zone 2

• Marine Approvals: ABS, BV, DNV-GL, LR

• Protection Rating: IP20

Engineering Insights and Operational Logic

The TB842 (3BSE022464R1) is a versatile interface that supports both Simplex (ring topology) and Duplex (row topology) configurations. In a simplex setup, nodes are connected in a continuous loop to optimize cable runs, while duplex configurations allow for point-to-point row segments. The module acts as a critical bridge: for single I/O setups, it connects to a CI801 via the TB806; for redundant I/O, it interfaces with CI840 units via the TU846/TB846 assembly. Its use of HCS and Plastic fiber allows for flexible distance planning—HCS for longer runs and plastic for cost-effective, short-range cabinet linking—ensuring that high-speed I/O data remains synchronized across the entire plant floor.