Product Overview: Allen-Bradley 1769-OB8 Output Module
The Allen-Bradley 1769-OB8 is a compact, solid-state 24V DC digital sourcing output module engineered for the CompactLogix family of controllers and I/O. This high-current output module delivers 8 outputs arranged as 4 points per group, making it a reliable choice for demanding industrial applications. As part of the 1769 Series of Compact I/O Modules, the 1769-OB8 supports expansion I/O in MicroLogix controllers, as well as integration with EtherNet/IP (1769-AENTR) or DeviceNet (1769-ADN) adapters, or directly with a CompactLogix controller. Its read/writable configuration data allows you to program the module to maintain the last state or apply user-defined conditions, providing flexibility in control logic.
With a voltage range of 20.4-26.4V DC and a current draw of 145 mA at 5.1V, the 1769-OB8 ensures stable operation in transient conditions. It handles surge currents of 4A for 10 ms, repeatable every 2 seconds, which is critical for driving inductive loads. The module's input data file reflects the output data echo rather than the electrical state of the terminals, so monitoring logic must account for this behavior. The Allen-Bradley 1769-OB8 can be mounted on a DIN rail or panel and assembled with a controller or adjacent I/O module either before or after mounting. Always lock the bus connectors together to guarantee proper electrical connections.
Technical Specifications
The following table lists the key specifications for the Allen-Bradley 1769-OB8. These parameters are sourced directly from the manufacturer's data and are essential for system design.
| Specification |
Value |
| Manufacturer |
Rockwell Automation |
| Brand |
Allen-Bradley |
| Part Number / Catalog No. |
1769-OB8 |
| Product Line |
CompactLogix |
| Module Type |
DC Output Module |
| Input Type |
Digital Output |
| Communication Cable |
8 Point |
| Shipping Weight |
2 lbs. |
| Shipping Dimensions |
8 x 8 x 5 in. |
| Series |
A and B |
| Wire Size (Stranded) |
22-16 AWG |
| Replacement Terminal Block |
1769-RTBN18 |
| Replacement Door |
1769-RD |
| Mounting |
Panel Mount or DIN Rail |
The 1769-OB8 operates with a source voltage of 24V DC, providing 8 outputs with 4 points per group. Its voltage range spans 20.4-26.4V DC, ensuring compatibility with standard 24V systems. The module draws 145 mA at 5.1V, and its surge current rating of 4A for 10 ms is repeatable every 2 seconds, making it suitable for high-inrush loads.
Key Features & Benefits
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8 High-Current Outputs: Each output can handle demanding loads, reducing the need for external relays.
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Flexible Mounting: Panel mount or DIN rail installation simplifies integration into existing cabinets.
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Read/Write Configuration: Programmable last-state and user-defined conditions enhance control flexibility.
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Compact Design: Space-saving form factor fits into tight control panels.
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Current Product Status: The 1769-OB8 is an active, current product, ensuring long-term availability.
Industry Applications
The Allen-Bradley 1769-OB8 is ideal for applications requiring reliable digital output control, such as:
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Material Handling: Controlling conveyor motors, solenoids, and indicator lights in sorting and packaging lines.
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Process Control: Actuating valves and pumps in batch processing systems, where high-current outputs are essential.
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Machine Automation: Driving contactors and relays in CNC machines, presses, and robotic cells, benefiting from the module's surge current capability.
Installation & Setup Guide
Proper installation of the 1769-OB8 ensures reliable operation. Follow these steps:
- Mount the module on a DIN rail or panel using the integrated mounting mechanism.
- If assembling with a controller or adjacent I/O module, lock the bus connectors together to ensure secure electrical connections.
- Connect the 24V DC power supply within the 20.4-26.4V DC range to the module's power terminals.
- Wire the output devices using stranded wire of 22-16 AWG size. Ensure proper torque settings per the manufacturer's guidelines.
- Configure the module's read/writable data using your programming software to set last-state or user-defined conditions as needed.
- Verify all connections before energizing the system.
Maintenance & Reliability
To maximize the service life of the Allen-Bradley 1769-OB8, perform routine inspections every 6-12 months. Check for loose terminal connections, signs of overheating, or dust accumulation on the module's surface. The module's solid-state design reduces mechanical wear compared to relay-based outputs, lowering maintenance costs and downtime. Since the 1769-OB8 is a current product, replacement parts and support are readily available, ensuring long-term reliability for your automation infrastructure.
Compatibility & Integration
The 1769-OB8 is part of the CompactLogix series and integrates seamlessly with:
- MicroLogix controllers for expansion I/O.
- CompactLogix controllers as local or remote I/O.
- EtherNet/IP adapters (1769-AENTR) for networked I/O.
- DeviceNet adapters (1769-ADN) for distributed control.
This broad compatibility makes the 1769-OB8 a flexible choice for both new installations and system upgrades. The module supports Series A and B, ensuring compatibility across different revisions.
Buying Guide
When purchasing the 1769-OB8, verify the part number matches your system requirements. Confirm the module's series (A or B) and check the replacement terminal block (1769-RTBN18) and door (1769-RD) availability if needed. Ensure your power supply delivers 24V DC within the specified range. For genuine, in-stock Allen-Bradley 1769-OB8 modules with competitive pricing, consider PLC Source PRO as your trusted supplier.