Allen-Bradley|1788-FBJB6|Foundation Fieldbus junction box
Description
The Allen-Bradley 1788-FBJB6 is a Foundation Fieldbus junction box designed for fault-tolerant fieldbus network connectivity.
Features
Six current-protected drop-line ports
Bus fault isolation with LED diagnostics
Auto-reset and manual reset options
Technical Specifications
Electrical
Operating Voltage: 12–32V DC
Power Consumption: 40mA max at 24V
Fieldbus Cable: 18 AWG (0.75 mm²) max, 24 AWG min
Connectivity
Ports:
1 Bus-Input (T1)
1 Bus-Output (T2)
6 Field Device Drop-Lines (D1–D6, current-protected)
Termination: DIP-switch configurable
Protection & Diagnostics
Over-Current Protection: Isolates faulty drops while maintaining bus operation
LED Indicators:
Green: Normal operation
Red: Over-current fault
Off-Red: Previous fault (no current)
Green-Red: Intermittent fault
Environmental
Operating Temperature: 0–50°C (32–122°F)
Storage Temperature: 0–50°C (32–122°F)
Enclosure Rating: IP20
Configuration
Reset Modes (DIP switches 3 & 4):
Manual reset
Auto-reset (5 min, 1 hr, 12 hrs)
Allen-Bradley|1788-FBJB6|Foundation Fieldbus junction box


Allen-Bradley|1788-FBJB6|Foundation Fieldbus junction box
Description
The Allen-Bradley 1788-FBJB6 is a Foundation Fieldbus junction box designed for fault-tolerant fieldbus network connectivity.
Features
Six current-protected drop-line ports
Bus fault isolation with LED diagnostics
Auto-reset and manual reset options
Technical Specifications
Electrical
Operating Voltage: 12–32V DC
Power Consumption: 40mA max at 24V
Fieldbus Cable: 18 AWG (0.75 mm²) max, 24 AWG min
Connectivity
Ports:
1 Bus-Input (T1)
1 Bus-Output (T2)
6 Field Device Drop-Lines (D1–D6, current-protected)
Termination: DIP-switch configurable
Protection & Diagnostics
Over-Current Protection: Isolates faulty drops while maintaining bus operation
LED Indicators:
Green: Normal operation
Red: Over-current fault
Off-Red: Previous fault (no current)
Green-Red: Intermittent fault
Environmental
Operating Temperature: 0–50°C (32–122°F)
Storage Temperature: 0–50°C (32–122°F)
Enclosure Rating: IP20
Configuration
Reset Modes (DIP switches 3 & 4):
Manual reset
Auto-reset (5 min, 1 hr, 12 hrs)