1791-0B32 Allen-Bradley Discrete DC Block I/O 32-Output Module
The 1791-0B32 functions as a high-density, remote discrete output solution within the Allen-Bradley Series B Block I/O family.
This 24V DC module integrates a programmable controller interface, power supply, and 32 signal-generating circuits into a single standalone unit.
Designed for Universal Remote I/O communication, the 1791-0B32 allows engineers to distribute control effectively across material handling and packaging lines while minimizing enclosure costs and wiring complexity.
Technical Matrix & Operational Ratings
- Manufacturer: Allen-Bradley / Rockwell Automation
- Model Number: 1791-0B32
- Output Density: Thirty-two (32) Discrete DC channels
- Nominal Voltage: 24V DC (Operating range 10-30V DC)
- External Power Requirements: 19.2-30V DC; 300mA current requirement
- Signal Switching Speed: Maximum 0.5ms ON delay and 1.0ms OFF delay
- On-State Performance: 1V maximum voltage drop at rated current levels
- Leakage Current: 0.5mA maximum in OFF-state for safe operation
- Thermal Management: 65.5 BTU/hr dissipation; 19.2W maximum power dissipation
- Protection Circuitry: Internally fused outputs ensure component and logic safety
- Physical Profile: 6.95 x 4.35 x 3.85 inches; Weight 1.75 lbs (0.79 kg)
Oiltech Controls’s Insight: High-Density Deployment
- The 1791-0B32 provides the highest output density in the 1791 series for large panels.
- Vertical mounting is technically superior, offering 500mA per output at 60 °C environmental temperature.
- Horizontal mounting reduces the output rating to 250mA at 60 °C to prevent overheating.
- Engineers save significant downtime using the removable terminal strips during unit replacement cycles.
- Internal switch assemblies allow precise setting of rack numbers and communication rates without software.
- Dual-status indicators provide instant visual diagnostics for COMM, STATUS, and 16 I/O LEDs.
- For immediate technical support, contact info@oiltechcontrols.com or WhatsApp +86 158 8020 0923.
Equipment Compatibility & Installation
- Seamlessly interfaces with legacy PLC-2, PLC-3, and PLC-5/250 series programmable controllers.
- Fully supports SLC 5/02 modular controllers via discrete transfer over Remote I/O links.
- Requires 14 AWG (2.0 mm²) solid or stranded wire for secure terminal strip connections.
- Built-in mounting versatility allows for installation in small, cost-effective enclosures near field devices.
- Optimized for high-speed automated machinery including sorters, conveyors, and complex palletizer systems.
Supply Chain & Global Logistics
- Warranty Policy: Includes a full 12-month quality guarantee on all 1791-0B32 units.
- Dispatch: Guaranteed professional dispatch within 24-28 hours for all confirmed in-stock orders.
- Shipping Carriers: Priority worldwide delivery available via FedEx, UPS, and DHL.
- Packaging: Industrial-grade anti-static protection ensures safe arrival of sensitive electronic hardware components.
Professional FAQ & Selection Guide
- Can the 1791-0B32 be used with modern ControlLogix systems?
Yes, provided you use a 1756-DHRIO module to bridge the Universal Remote I/O link. - How does mounting orientation affect the lifespan of the block?
Vertical mounting facilitates natural convection; horizontal mounting requires extra ventilation space for air-cooling. - What happens if an output channel shorts out during operation?
The internal fusing protects the logic circuitry, though the specific group fuse may blow. - Selection Guide: When should I choose 32-channels over 16-channel variants?
Select the 1791-0B32 when you have high-density valve banks to reduce total RIO nodes. - Expert Tip: How do I verify the communication rate on a replacement?
Check the two side-mounted switch assemblies to match your existing network baud rate settings.
Author: Oiltech Controls
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