Allen-Bradley AC Output Module for CompactLogix and MicroLogix Systems

Overview of the Allen-Bradley 1769-OA8 Module

For controlling AC loads in industrial automation systems, the Allen-Bradley 1769-OA8 provides a reliable 8-point AC output module.
Engineers designed this CompactLogix discrete output module to operate at voltages from 85 to 265V AC with 47 to 63 Hz frequency.
Specifically, the 1769-OA8 features two groups of four outputs each, giving you flexible load distribution options.
In addition to the flexible grouping, this module works with both CompactLogix chassis systems and MicroLogix 1500 controllers.
Each group includes an independent AC common terminal, allowing separate voltage sourcing for different applications.
Furthermore, the 1769-OA8 drives AC relays, contactors, motor starters, solenoids, and pilot lamps effectively.
Due to its versatile design, this output module suits a wide range of AC load control applications across many industries.

Technical Specifications of the 1769-OA8 Module

Below are the complete technical parameters for this AC output module.

Output Configuration and Channel Grouping

When examining the 1769-OA8, you will find its 8 outputs arranged into two isolated groups of four channels each.
Group 1 includes output channels 0, 1, 2, and 3, which handle the first four loads in your system.
Group 2 includes output channels 4, 5, 6, and 7, which manage the remaining four loads independently.
Each group features an independent AC common terminal, enabling separate voltage connections for each group.
One group may operate at a different voltage category than the other group, offering installation flexibility.
Alternatively, both groups may share the same voltage category, simplifying wiring and spare parts.
For this reason, the Allen-Bradley 1769-OA8 offers excellent flexibility for mixed voltage installations.

Operating Voltage and Frequency Range

Engineers appreciate the wide voltage range of the 1769-OA8, which supports global compatibility.
The minimum operating voltage measures 85V AC, accommodating nominal 100V AC systems comfortably.
At the upper end, the maximum operating voltage reaches 265V AC, covering nominal 240V AC systems easily.
The frequency range spans from 47 to 63 Hz, making the module suitable for both 50 Hz and 60 Hz power systems.
For 120V AC applications commonly found in North America, the Allen-Bradley 1769-OA8 provides reliable switching performance.
For 240V AC applications used internationally, the same module works without any modification or derating.
Consequently, one catalog number serves both North American and international voltage standards seamlessly.

Signal Delay and Switching Performance

The 1769-OA8 uses solid-state switching technology, which delivers predictable signal delay characteristics for your applications.
Turn-on signal delay measures exactly 1/2 cycle of the AC power waveform from the switching command.
Similarly, turn-off signal delay also measures 1/2 cycle, providing symmetrical response for consistent control.
At 50 Hz operation, one full cycle equals 20 milliseconds, so the half-cycle delay is approximately 10 milliseconds.
At 60 Hz operation, one full cycle equals 16.67 milliseconds, so the half-cycle delay is approximately 8.33 milliseconds.
The Allen-Bradley 1769-OA8 switches at zero-crossing points, which significantly reduces electrical noise generation.
As a result, the module provides clean switching without creating excessive electromagnetic interference in your cabinet.

Compatible Controllers and Systems

The 1769-OA8 works seamlessly with both CompactLogix and MicroLogix 1500 controller families.
For CompactLogix systems, the module installs directly into the 1769 I/O chassis using standard procedures.
For MicroLogix 1500 systems, the Allen-Bradley 1769-OA8 connects via the base unit ribbon cable for communication.
When using DeviceNet networks, pair this module with the 1769-ADN communication adapter for network connectivity.
For Ethernet/IP networks, use this module alongside the 1769-AENTR communication adapter for remote I/O applications.
The programming software varies depending on which controller you use, so check compatibility before starting.
Nevertheless, the 1769-OA8 adapts to your existing control architecture without requiring hardware modifications.

Power Supply Distance Rating

Following standard 1769 system rules, the 1769-OA8 adheres to specific power supply distance requirements.
The power supply distance rating limits this module to positions within 8 slots from the power supply unit.
You must not install the Allen-Bradley 1769-OA8 more than 8 modules away from the supplying power supply.
This distance rating ensures adequate voltage levels reach all modules on the backplane for reliable operation.
For larger systems requiring more than 8 modules, add additional power supplies to extend the effective distance rating.
Compatible power supplies include the 1769-PA2, 1769-PB2, 1769-PA4, and 1769-PB4 models.
Thus, always follow the distance rating guidelines when designing your I/O chassis layout for best results.

Current Draw and Power Consumption

The 1769-OA8 draws 145 mA from the +5V DC backplane bus line under normal operating conditions.
This current draw converts to approximately 1.125 Watts of power consumption from the +5V supply.
Total heat dissipation from the Allen-Bradley 1769-OA8 reaches 2.12 Watts under maximum load conditions.
Despite this modest heat output, no special cooling provisions are required under normal cabinet conditions.
For high-density installations with many modules, however, ensure adequate airflow around the module.
The power consumption remains consistent regardless of the actual output load current being switched.
Therefore, the 1769-OA8 places only a modest demand on your system power supply capacity.

Typical AC Load Applications

The 1769-OA8 drives a wide variety of AC loads commonly found in industrial automation systems worldwide.
For motor control applications, the module switches AC contactors and motor starters reliably and repeatedly.
For solenoid actuators requiring AC power, the Allen-Bradley 1769-OA8 provides direct switching capability without external relays.
Variable Frequency Drives (VFDs) frequently accept start and stop commands from this output module's channels.
AC relays and interposing relays work perfectly with the 1769-OA8 outputs, extending control to higher power loads.
Additionally, pilot lamps and indicator lights signal machine status effectively through these outputs.
In summary, the module serves as a general-purpose AC output solution for many field devices.

Wiring Specifications and Terminal Connections

The 1769-OA8 uses removable terminal blocks, which make field wiring much more convenient during installation.
For solid copper wire, acceptable conductor sizes range from 22 to 14 AWG for flexibility.
For stranded copper wire, acceptable conductor sizes range from 22 to 16 AWG for ease of handling.
Always use copper wire rated for 90 degrees Celsius minimum temperature to ensure safe operation.
Terminal screws accept a standard flat-blade screwdriver, making secure connections quick and easy.
The Allen-Bradley 1769-OA8 provides clear labeling for each output channel, reducing wiring errors.
Consequently, field wiring remains straightforward, maintainable, and easy to troubleshoot over time.

Mounting Options and Mechanical Design

The 1769-OA8 supports both DIN rail and panel mounting methods, giving you installation flexibility.
For DIN rail mounting, simply clip the module onto standard 35mm EN rail with firm pressure.
For panel mounting, use screws through the integrated mounting tabs for secure attachment.
The Allen-Bradley 1769-OA8 uses standard 1769 mechanical locking mechanisms for consistent installation.
This locking mechanism secures the module firmly to adjacent modules and the backplane bus.
For removal when necessary, use a screwdriver to release the locking tabs from the adjacent module.
Thus, installation and replacement require minimal tools and time, reducing maintenance downtime.

Environmental Specifications

The 1769-OA8 operates reliably across standard industrial temperature ranges found in most factories.
Operating temperature spans 0 to 60 degrees Celsius (32 to 140 degrees Fahrenheit) for normal conditions.
Relative humidity tolerance reaches 5 to 95 percent non-condensing, accommodating humid environments comfortably.
For long-term storage, the module tolerates wider temperature extremes as specified in the manual.
The Allen-Bradley 1769-OA8 requires installation within a protected enclosure for safety and reliability.
For shock and vibration resistance, follow standard 1769 system specifications outlined in the documentation.
Despite these requirements, the module suits most factory automation environments without special handling.

Certifications and Standards Compliance

The 1769-OA8 carries multiple international certifications, enabling global deployment without delays.
c-UL-us certification covers UL Listed Industrial Control Equipment for both United States and Canada.
CE compliance meets European Union directives for both safety and electromagnetic compatibility requirements.
RCM certification permits sale in Australian and New Zealand markets without additional approvals.
The Allen-Bradley 1769-OA8 follows open enclosure standards, requiring installation within a protective cabinet.
For hazardous location installations, check the specific product marking on the module label carefully.
Accordingly, this output module ships worldwide without compliance barriers or additional testing.

Installation Guidelines for the 1769-OA8 Module

Follow these steps to install the Allen-Bradley 1769-OA8 correctly and safely.

1. First, remove power from the 1769 system completely before beginning any installation work.

2. Next, mount the module on DIN rail or panel using your preferred installation method.

3. For DIN rail mounting, clip the 1769-OA8 onto the rail at your desired slot position.

4. For panel mounting, use screws through the integrated mounting tabs for secure attachment.

5. Then, slide adjacent modules together firmly until the backplane connectors engage completely.

6. Meanwhile, ensure the power supply distance rating does not exceed 8 modules from the supply.

7. After that, remove the terminal block from the 1769-OA8 for easier field wiring access.

8. Connect AC loads using 22-14 AWG solid wire or 22-16 AWG stranded copper wire.

9. Once wiring completes, apply power to the system and download your controller program.

10. Finally, test each output channel individually to verify proper operation before production.

Only trained automation technicians should install this output module for safety reasons.

Package Contents for the Allen-Bradley 1769-OA8

• One Allen-Bradley 1769-OA8 AC output module

• One removable terminal block for convenient field wiring

• Integrated DIN rail mounting clips pre-installed on the module

• Panel mounting tabs for alternative installation methods

• Quick start installation instruction sheet with diagrams

Common FAQs About This Allen-Bradley 1769-OA8 Module

Q1: What voltage range does the 1769-OA8 outputs support?
A1: The Allen-Bradley 1769-OA8 operates from 85V AC to 265V AC continuously. This wide range covers both 120V and 240V nominal systems globally.

Q2: How does the module group its 8 outputs for isolation?
A2: The 1769-OA8 groups its outputs into two sets of four channels each. Group 1 uses channels 0 through 3, while Group 2 uses channels 4 through 7.

Q3: What signal delay should I expect when switching outputs?
A3: The Allen-Bradley 1769-OA8 provides turn-on and turn-off delays of 1/2 cycle each. At 60 Hz, this equals approximately 8.33 milliseconds of delay.

Q4: Which controllers work with the 1769-OA8 output module?
A4: The 1769-OA8 works with CompactLogix and MicroLogix 1500 controllers. For remote I/O applications, use 1769-ADN or 1769-AENTR adapters.

Q5: What is the power supply distance rating for this module?
A5: The Allen-Bradley 1769-OA8 carries a power supply distance rating of 8 modules. Do not install this module more than 8 slots away from the power supply.

Typical Applications for the Allen-Bradley 1769-OA8

The Allen-Bradley 1769-OA8 excels in AC load control applications throughout industrial facilities worldwide.
You can use this module for HVAC damper and valve actuator control in building automation systems.
Similarly, the module works well for conveyor motor starters and contactors in material handling lines.
For industrial lighting control systems, the 1769-OA8 switches LED and fluorescent fixtures reliably.
Material handling equipment uses this module for solenoid-operated diverters and gates in sorting systems.
Additionally, packaging machinery controls heat sealers and cutters through these eight outputs.
In short, any AC load requiring discrete ON/OFF control suits the 1769-OA8 perfectly.

Ordering and Logistics Information

From our global distribution center, this Allen-Bradley 1769-OA8 AC output module ships promptly.
Original factory packaging protects this sensitive electronic module during transit to your facility.
For volume pricing on Rockwell Automation CompactLogix products, please contact our team directly.
Before placing an order, always verify your load voltage, current, and wiring requirements carefully.
For urgent automation project needs, we offer express shipping options to most locations globally.