Allen-Bradley,1756-OA8D
Allen-Bradley,1756-OA8D
Allen-Bradley,1756-OA8D
Allen-Bradley,1756-OA8D
Allen-Bradley,1756-OA8D
Allen-Bradley,1756-OA8D
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1756-OA8D/A

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The Allen-Bradley 1756-OA8D/A is a diagnostic AC output module belonging to the ControlLogix family, designed to be installed in any slot of a 1756 ControlLogix chassis.
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Technical specifications for 1756-OA8D/A

  • Manufacturer:
    Allen-Bradley
  • Part Number:
    1756-OA8D/A
  • Product Family:
    ControlLogix
  • Short trip, min:
    12 A for 500 µs
  • Outputs:
    8 diagnostic, electronic fusing (4 points/group)
  • Voltage category:
    120V AC 50/60 Hz
  • Current draw @ 5.1V:
    175 mA
  • Current draw @ 24V:
    250 mA
  • Total backplane power:
    6.89 W
  • Weight:
    0.26 kg
  • Estimated shipping dimensions:
    3.5x14.3x14.5cm
  • Tariff Code:
    8537101190
  • Country of origin:
    USA
  • Place of shipment:
    Xiamen, Fujian, China
By purchasing this item, you agree to the Terms & Conditions, ApterPower is not an authorized distributor for listed manufacturers or tradenames and therefore the manufacturer's warranty does not apply. All our products come with ApterPower's 1-year warranty.

More Information

Overview Manuals Specifications Diagnostics Operating Applications

Features:

  • Embedded Diagnostics for Reduced Downtime
  • High Surge Current Tolerance for Demanding Loads
  • Global Certifications and Hazardous Location Approval
The Allen‑Bradley 1756‑OA8D/A integrates advanced diagnostic capabilities including off‑state detection, output verification, pulse testing, and field power loss monitoring with zero‑cross tracking. These built‑in diagnostics allow engineers to remotely identify failed outputs or missing AC field power, and the module provides time‑stamped fault data with ±1 ms accuracy. As a result, the Allen‑Bradley 1756‑OA8D/A significantly reduces unplanned downtime and simplifies maintenance in critical control systems.

Designed to handle inrush currents from solenoids, relays, and pilot lights, the Allen‑Bradley 1756‑OA8D/A supports a surge current of 8 A for 43 ms per point, recurring every 2 seconds at 30 °C. Each output point is rated at 1 A continuously, with a total module current of 8 A at 30 °C that linearly derates at higher temperatures. This robust output capability makes the Allen‑Bradley 1756‑OA8D/A a reliable choice for controlling a wide range of AC loads without external suppression components.

The Allen‑Bradley 1756‑OA8D/A holds multiple international certifications including cULus, CE, RCM, FM, KC, UKCA, and Moroccan compliance, and is approved for use in Class I Division 2 Group A,B,C,D hazardous locations. These certifications confirm that the Allen‑Bradley 1756‑OA8D/A meets stringent industrial safety, EMC, and environmental standards such as EN 61131‑2 and EN 61000‑6‑2/4. For global machine builders and end users, this ensures regulatory acceptance and reduces project risk across different regions.

The 1756-OA8D/A Allen-Bradley ControlLogix Output Module may still be available for purchase and support from Apter Power beyond End-Of-Life (EOL) by the manufacturer (OEM).
Allen-Bradley 1756-OA8D/A ControlLogix Output Module Manuals,Datasheets,Link Important Notice: Other accessories, manuals, cables, calibration data, software, etc. are not included with this equipment unless listed in the above stock item description. All prices are shown in USD.
Allen-Bradley 1756-OA8D/A ControlLogix Output Module

General

  • Manufacturer Allen-Bradley
  • Model 1756-OA8D/A
  • Condition New Original ready stock
  • Product Family 1756-IA8D,1756-IA16,1756-IA32
Important Notice: Other accessories, manuals, cables, calibration data, software, etc. are not included with this equipment unless listed in the above stock item description. All prices are shown in USD.
  • The module includes LED indicators for each output channel, allowing quick visual identification of status and faults. This helps technicians reduce troubleshooting time.
  • It supports controller-based diagnostics, enabling real-time fault detection and reporting. This improves system visibility and reliability.
  • Built-in fault detection mechanisms identify issues such as short circuits or overloads. This ensures safe operation of connected devices.
  • Diagnostic data can be accessed via ControlLogix software tools, enabling predictive maintenance strategies.
  • The module operates within a wide AC voltage range, supporting flexible deployment. This ensures compatibility with various industrial power systems.
  • It is designed for continuous operation in industrial environments. This allows for high system uptime and reliability.
  • Simple installation within the ControlLogix chassis reduces setup complexity. This minimizes commissioning time.
  • The module requires minimal maintenance due to its solid-state design.
  • Used in manufacturing automation systems for controlling machinery outputs. This improves operational efficiency.
  • Suitable for energy and power systems requiring reliable switching. This ensures stable performance.
  • Ideal for process industries such as oil & gas and chemical plants. This supports critical operations.
  • Applied in building automation systems for lighting and equipment control.
Description
The Allen-Bradley 1756-OA8D/A includes advanced diagnostic capabilities such as off-state detection, output verification, pulse testing, and field power loss detection. It features a configurable pulse test with a maximum width and time delay from zero cross, and it detects field power loss at a minimum peak voltage of 25V using a firmware phase-locked loop. Additionally, the Allen-Bradley 1756-OA8D/A provides time-stamped diagnostics with an accuracy of ±1 ms, and its short-circuit trip occurs at 12 A for 500 μs.

The Allen-Bradley 1756-OA8D/A operates within a temperature range of 0 to 60 °C (32–140 °F) and a non-condensing relative humidity of 5–95%. It withstands operating shocks of 30 g and non-operating shocks of 50 g, with vibration tolerance of 2 g at 10–500 Hz. The Allen-Bradley 1756-OA8D/A weighs approximately 1 kg (2.25 lb), has a single slot width, and uses a removable terminal block (RTB) with user-configurable keying.

The Allen-Bradley 1756-OA8D/A holds multiple international certifications, including cULus, CE, RCM, FM, KC, UKCA, and Moroccan compliance. It meets industrial immunity and emission standards such as EN 61000-6-2, EN 61000-6-4, and EN 61131-2. These certifications confirm that the Allen-Bradley 1756-OA8D/A is suitable for use in industrial control systems, including Class I Division 2 hazardous locations.
Revisions

Revision Part #

Also known as

1756-OA8D Ser A
1756-OA8D/A, Series A, Rev A
Alternative Names
1756-0A8D 1756-OABD 17560A8D 1756OABD
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FAQS

The following is a list of questions commonly asked by our customers. Please contact us if you have a question about our process that is not answered below.
What makes the Allen‑Bradley 1756‑OA8D/A different from a standard AC output module?
Unlike basic AC output modules, the Allen‑Bradley 1756‑OA8D/A integrates embedded diagnostics including off‑state detection, output verification, pulse testing, and field power loss detection with zero‑cross tracking. These features allow engineers to identify failed outputs or missing field power remotely, reducing machine downtime. For procurement teams, this diagnostic capability translates into lower total cost of ownership and improved system availability.
What is the maximum output current, and how does derating work on the 1756‑OA8D/A?
Each point of the Allen‑Bradley 1756‑OA8D/A supports 1 A continuously at 30 °C, with a total module current of 8 A at the same temperature. Above 30 °C, both per‑point and module currents derate linearly. Engineers can rely on predictable thermal performance, while purchasing managers benefit from a robust design that minimizes oversizing or costly cooling modifications.
Can the Allen‑Bradley 1756‑OA8D/A handle inrush or surge currents typical of solenoid and relay loads?
Yes. The Allen‑Bradley 1756‑OA8D/A withstands a surge current of 8 A for 43 ms per point, recurring every 2 seconds at 30 °C. This makes it suitable for controlling AC solenoids, pilot lights, and small contactors without external suppression. Engineers gain reliable switching, and procurement avoids specifying larger, more expensive output modules for the same application.
What certifications does the 1756‑OA8D/A hold, and why do they matter for global projects?
The Allen‑Bradley 1756‑OA8D/A carries cULus, CE, RCM, FM, KC, UKCA, and Moroccan certifications, including Class I Division 2 hazardous location approval. For engineering teams, this ensures compliance with international safety and EMC standards (EN 61131‑2, EN 61000‑6‑2/4). For procurement, certified modules simplify global machine acceptance, reduce regulatory risk, and shorten project lead times.