1769-OB8 CompactLogix Digital DC Output Module by Allen-Bradley

Product Overview

The 1769-OB8 is an 8-channel solid-state 24V DC digital sourcing output module designed specifically for the Allen-Bradley CompactLogix and MicroLogix expansion ecosystem. Engineered to handle high-current inductive loads, this module delivers reliable switching performance across compact automation panels. Automation professionals depend on the 1769-OB8 for its robust surge handling, flexible expansion compatibility via local racks or communication adapters, and dependable performance in rigorous industrial environments.

Technical Specifications

• Brand: Allen-Bradley / Rockwell Automation
• Series: CompactLogix / Compact I/O (Series A and B)
• Part Number: 1769-OB8
• Product Type: 8-Point Digital DC Sourcing Output Module
• Operating Voltage Range: 20.4 to 26.4 VDC (24 VDC nominal source)
• Output Channels: 8 points total, divided into two (2) groups of 4 points each
• Surge Current Rating: 4 Amps for 10 ms (repeatable every 2 seconds per output)
• Backplane Current Draw: 145 mA at 5.1 VDC
• Wire Size Compatibility: 22 to 16 AWG stranded copper wiring
• Replacement Accessories: 1769-RTBN18 terminal block and 1769-RD replacement door
• Physical Mounting: DIN rail or direct panel mount installation

Installation & Integration Guide

• Mechanical Assembly: Mount the 1769-OB8 securely onto a standard DIN rail or backplane panel. Lock adjacent bus connectors tightly together to guarantee clean electrical communication.
• System Flexibility: Compatible with CompactLogix controllers, MicroLogix expansion assemblies, or distributed nodes utilizing EtherNet (1769-AENTR) and DeviceNet adapters.
• Wiring Termination: Connect field load lines using 22 to 16 AWG stranded wire terminated neatly into the 1769-RTBN18 removable terminal block housing.

Commissioning & Maintenance Ease

• Configuration States: Program read/writable configuration data to maintain user-defined conditions or safe last-state behaviors during controller mode transitions.
• Output Data Echo: Utilize the controller input data file to monitor output data echo status, ensuring software-commanded states match system logic.
• Modular Upkeep: Replace damaged doors or terminal blocks easily using designated replacement part kits (1769-RD and 1769-RTBN18) without rewiring the entire panel.

Compatibility & Certifications

• Controller Compatibility: Fully compatible with Allen-Bradley CompactLogix controllers and modular expansion backplanes.
• Industrial Standards: Built to meet strict Rockwell Automation electrical and mechanical performance standards.

Packing List & Warranty Terms

• Packing List: One (1) 1769-OB8 DC Output Module, 1769-RTBN18 terminal block, protective casing, and documentation sheet.
• Warranty Terms: Protected by a comprehensive 12-month warranty covering structural integrity and functional performance from the date of purchase.

Shipping & Logistics

• Courier Network: Secure, expedited international delivery managed through premier global carriers including FedEx, UPS, and DHL.
• Fulfillment Window: Orders are verified, securely packaged, and dispatched within 24-48 hours to minimize unexpected plant downtime.

Typical Application Scenes

• Discrete Manufacturing: Driving high-current solenoid valves, small DC motors, and indicator stack lights on automated assembly lines.
• Material Handling Systems: Switching high-frequency pneumatic actuators and sorting gates on high-speed conveyor networks.
• OEM Machine Skids: Consolidating digital output control within compact, space-constrained CompactLogix control cabinets.

Global PLC Spare HUB Insight & Field Experience

When driving heavy inductive loads with solid-state source modules like the 1769-OB8, back-EMF spikes can cause premature output transistor degradation if proper suppression is omitted. Based on field installation experience, our engineering team strongly recommends installing flyback diodes across DC inductive loads (such as relay coils and solenoids) and respecting the 4A surge current timing window to prevent thermal overloads during repetitive high-frequency switching cycles.

Frequently Asked Questions

Does the input data file of the 1769-OB8 reflect the physical electrical state of the output terminals?

No, the module's input data file reflects the output data echo (what the controller commands) rather than detecting open or shorted field wiring conditions.

How are the 8 output channels grouped on this module?

The 8 output points are arranged into two (2) distinct groups of 4 points each, allowing for independent power common grouping.

Can this module be used for expansion with MicroLogix controllers?

Yes, the 1769-OB8 can be deployed as an expansion I/O module in MicroLogix controller assemblies utilizing compatible 1769 communication and bus interfaces.

What wire sizes are recommended for the terminal block connections?

Field wiring should utilize stranded copper wire sized between 22 AWG and 16 AWG to ensure secure clamping inside the 1769-RTBN18 terminal block.

What key criteria should I evaluate when replacing a CompactLogix output card?

Verify your controller platform series, voltage requirements (24 VDC sourcing), total point count (8 points), and backplane current consumption limits before ordering.

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