Allen-Bradley 1791-0B32 DC Output Block for Reliable Remote I/O Control

Product Introduction

Are you struggling to distribute I/O points across remote locations without sacrificing reliability or adding excessive wiring costs? The Allen-Bradley 1791-0B32 DC output block from the 1791 Block I/O series provides a compact, cost-effective solution. This module integrates a programmable controller interface, power supply, and I/O connections into a single unit, simplifying installation and reducing enclosure size. With 32 output channels and a nominal 24V DC voltage, the 1791-0B32 is built for demanding industrial environments where uptime and ease of maintenance are critical.

Technical Specifications

The 1791-0B32 delivers an output voltage range of 10-30V DC, with an external power requirement of 19.2-30V DC. It supports a minimum on-state current of 1mA per output and a maximum on-state voltage drop of 1V at rated current. Output signal delay is 0.5ms on and 1.0ms off (max). The module has a current requirement of 300mA and dimensions of 6.95 x 4.35 x 3.85 inches. It offers an output current rating of 500mA at 60°C for vertical mounting and 250mA at 60°C for horizontal mounting. Maximum power dissipation is 19.2W, with thermal dissipation of 65.5 BTU/hr. Off-state leakage current is 0.5mA max. Wiring uses 2.0 mm² (14 AWG) solid standard wire with maximum insulation of 3/64 inch.

Industry Applications

The 1791-0B32 excels in packaging lines where remote I/O blocks control actuators and solenoids. In material handling systems, it manages conveyor diverters and stops with reliable 10-30V DC outputs. Operator interface panels benefit from its compact footprint and removable terminal strips, which simplify maintenance. By using remote I/O communication, this module reduces wiring complexity and lowers installation costs—a clear advantage for facilities expanding automation without overhauling existing control cabinets.

Installation & Setup Guidance

Mount the 1791-0B32 vertically whenever possible to optimize airflow and thermal performance. Horizontal mounting is acceptable if adequate ventilation is provided. Use 14 AWG solid wire for power and I/O connections, stripping insulation to 3/64 inch. The module includes removable terminal strips, allowing quick replacement without rewiring. Configure the starting I/O group, rack number, and communication rate using the two onboard switch assemblies. The module supports Universal Remote I/O communication for seamless integration with PLC-2, PLC-3, PLC-5/250, PLC-5, and SLC 5/02 controllers.

Maintenance & Reliability

Internal fusing protects the 1791-0B32 from overcurrent conditions, reducing the risk of damage. Regularly inspect the module for dust accumulation and ensure ventilation paths remain clear. The 1 COMM, 1 STATUS, and 16 I/O status indicators simplify troubleshooting—monitor these LEDs to quickly identify communication or output faults. With proper mounting and periodic inspection, the 1791-0B32 delivers long service life in demanding industrial settings.

Selection Guide & Purchasing Advice

Before ordering, verify that your controller supports Universal Remote I/O communication and that the 32 output channels match your application needs. The 1791-0B32 is a Series B module, so confirm compatibility with existing systems. BluePLC Industrial offers this module with reliable availability and competitive pricing. Contact our team to confirm lifecycle status and ensure the 1791-0B32 fits your current project requirements.