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

Overview

The 1788-FBJB6 from Allen-Bradley is a high-performance Fieldbus 6-Way Junction Box. It simplifies wiring and improves communication reliability in Profibus PA and Fieldbus Foundation (H1) networks.

This junction box supports stable data exchange between control systems and field devices, enhancing industrial automation efficiency. The 1788-FBJB6 can be mounted on DIN rails or panels, providing flexible installation in distributed control environments.

Designed for high reliability, the module operates on 24–32 VDC and consumes only 40 mA at 24 VDC. It features six drop connections and a single trunk input/output, making it ideal for complex fieldbus topologies.

The enclosure protection is rated IP20, ensuring safe operation in industrial environments. The device withstands shock levels up to 15 G and can operate at temperatures up to 50°C (122°F), making it suitable for harsh conditions.

Key Features

• Brand: Allen-Bradley

• Model: 1788-FBJB6

• Product Type: Fieldbus 6-Way Junction Box

• Supported Networks: Profibus PA, Fieldbus Foundation (H1)

• Number of Ports: 6-way

• Trunk Connection: 1 x H1 Media Trunk (In and Out)

• Drop Connections: 6 x H1 Media Drops

• Operating Voltage: 24–32 V DC

• Input Current: 0.5 A (Class 2 / SELV)

• Output Current (Trunk): 0.36 A (resistive load only)

• Power Consumption: 40 mA @ 24 V DC

• Terminal Torque: 0.5–0.6 Nm

• Mounting Type: DIN rail or panel-mounted

• Enclosure Protection: IP20

• Temperature Rating: Up to 50°C (122°F)

• Shock Resistance: 15 G

• Dimensions: 11.12 × 14.3 × 2.17 inches

• Weight: 0.8 kg

Technical Specifications

Advantages

• Simplifies wiring in complex fieldbus networks

• Supports Profibus PA and Fieldbus Foundation (H1) protocols

• Six drop connections plus trunk input/output for flexibility

• IP20 enclosure ensures safe industrial operation

• Compact, lightweight, and DIN rail or panel-mountable

• Reliable performance under high shock and temperature conditions

FAQ

Q1: Is the Allen-Bradley 1788-FBJB6 brand new?
A1: Yes, it is factory-sealed, original, and in stock.

Q2: How many fieldbus connections does it support?
A2: It has six drop connections and one trunk connection (in/out).

Q3: What networks are compatible with this junction box?
A3: It supports Profibus PA and Fieldbus Foundation (H1) networks.

Q4: What is the operating voltage and current?
A4: 24–32 VDC, 0.5 A input current, and 0.36 A trunk output current.

Q5: Can it handle industrial environmental conditions?
A5: Yes, IP20 rated, shock-resistant up to 15 G, and operates up to 50°C.

Q6: What mounting options are available?
A6: DIN rail or panel mounting is supported for flexible installation.