Allen-Bradley 1791-0B32 DC Output Block Module 32 Channels

Product Overview

The Allen-Bradley 1791-0B32 is a DC output block from the 1791 Block I/O series, designed by Rockwell Automation for reliable remote I/O in industrial environments. This module integrates a programmable controller interface, power supply, and signal generation into a single unit, reducing wiring and enclosure costs. With 32 discrete output channels, it is well-suited for applications like packaging, material handling, and operator interface panels where distributed control is needed.

Technical Specifications Breakdown

Key parameters for the 1791-0B32 are listed below for quick reference:

Industry Applications

In packaging lines, the 1791-0B32 controls actuators and solenoids with its 32 discrete outputs, ensuring precise timing for wrapping and sealing. For material handling systems, it manages conveyor diverters and stops, leveraging the 0.5ms on-delay for fast response. In operator interface panels, this module reduces wiring complexity by placing I/O near sensors and pushbuttons, cutting installation costs.

Installation & Setup Guidance

Mount the 1791-0B32 vertically for optimal airflow; horizontal mounting is acceptable with adequate ventilation. Use 14 AWG solid wire with maximum insulation of 3/64 in. for connections. The removable terminal strips simplify wiring and allow block replacement without rewiring. Set the starting I/O group, rack number, and communication rate using the two onboard switch assemblies.

Maintenance & Reliability

The module is internally fused for overcurrent protection. Inspect the enclosure for dust buildup quarterly to maintain cooling. The 1 COMM, 1 STATUS, and 16 I/O Status LEDs enable quick diagnostics. For horizontal mounting, note that output current is derated to 250mA at 60°C versus 500mA for vertical mounting.

Compatibility & Integration

The 1791-0B32 uses Universal Remote I/O communication and is compatible with PLC-2, PLC-3, PLC-5/250, PLC-5, and SLC 5/02 controllers. It can be placed in remote locations up to 10,000 feet from the processor, reducing cable runs.

Selection Guide & Purchasing Advice

When selecting a DC output block, verify your controller compatibility and output current needs. The 1791-0B32 offers 32 outputs with 500mA per channel (vertical mount). For lifecycle status and availability, contact AutoDCSTech before ordering. AutoDCSTech stocks genuine Allen-Bradley modules with fast shipping.

Troubleshooting & Common Issues

If outputs fail to energize, check the internal fuse and external power supply (19.2-30V dc). Use the STATUS LED to verify communication. For intermittent operation, inspect wiring for loose connections or damaged insulation. Ensure the module is not exceeding 19.2W power dissipation.