1788-FBJB6 | Allen-Bradley | 6-Port PROFIBUS PA Junction Box

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Allen-Bradley 1788-FBJB6 FOUNDATION Fieldbus 6-Way Junction Box

Product Overview

The 1788-FBJB6 is a robust, industrial-grade junction box manufactured by Rockwell Automation, designed specifically for FOUNDATION Fieldbus H1 and PROFIBUS PA networks. It serves as a central connectivity point, allowing for the distribution of a single fieldbus trunk line into six independent spur (drop) connections. By utilizing the 1788-FBJB6, engineers can implement a tree or star topology, significantly simplifying the wiring of intelligent field devices such as transmitters, valves, and sensors. This module is engineered for high-reliability process environments, featuring integrated protection and galvanic isolation to ensure that a fault on a single spur does not compromise the integrity of the entire network segment.

Technical Specifications

The 1788-FBJB6 is built to meet the rigorous physical layer requirements of the IEC 61158-2 standard.

• Manufacturer: Rockwell Automation / Allen-Bradley

• Model Number: 1788-FBJB6

• Product Type: 6-Way Fieldbus Junction Box

• Protocols Supported: FOUNDATION Fieldbus H1, PROFIBUS PA

• Port Configuration: 1 Trunk In, 1 Trunk Out (Loop-through), 6 Spur Outputs

• Operating Voltage: 9 – 32 VDC (Bus powered)

• Current Capacity: Dependent on total segment power budget (typically supports up to 500mA total)

• Impedance Matching: Optimized for 100 Ω shielded twisted-pair fieldbus cable

• Protection: Integrated transient surge protection per spur

• Isolation: Galvanic isolation between trunk and spur connections

• Operating Temperature: -40°C to +85°C (-40°F to +185°F)

• Housing Type: Open style, industrial-grade polymer/metal reinforced

• Mounting: Standard 35mm DIN Rail or Panel Mount

• Weight: 0.75 lbs (0.34 kg)

• Certifications: CE, UL, CSA, IECEx, ATEX (Zone 2 compliant)