Product Overview

The Allen-Bradley 1771-OWNA functions as a high-density digital contact output module engineered specifically for the legacy 1771 I/O chassis platform and PLC-5 control systems. This industrial hardware contains 32 independent, normally-open (N.O.) electromechanical relay contacts arranged in four isolated groups of eight outputs. It provides an efficient processing bridge for switching both AC and DC resistive electrical loads directly from controller memory logic.

To ensure long-term physical protection when deployed in challenging manufacturing spaces, this module features factory-applied conformal coating. This specialty protective layer shields internal electronic components against airborne moisture, dust, and corrosive chemicals.

We deliver this hardware exclusively as 100% brand new, original, and factory-sealed to guarantee uncompromised mechanical relay lifecycles, reliable contact resistance, and long-term installation stability.

Technical Specifications

The table below logs the precise mechanical, electrical, and thermal parameters for the 1771-OWNA relay contact card. All alphanumeric data utilizes standard ASCII characters.

Engineering Advantages

• High-Density Rack Space Consolidation: Packing 32 normally-open mechanical contact points into a single 1771 slot saves massive space inside legacy enclosures. This high concentration minimizes the number of total chassis racks required during plant layout expansions.
• Multi-Group Electrical Isolation: Splitting the 32 outputs into four isolated sets of eight channels allows engineering teams to mix different voltage references safely on the same physical module card. This configuration isolates distinct industrial circuit loops and prevents localized cross-talk.
• Corrosive Environment Mitigation: The factory-applied conformal coating provides a durable barrier against humidity and gaseous environmental hazards. This protective treatment stops trace chemical tracking, dendritic metal growths, and rust, preventing premature field component failure.
• Simplified Field Wiring Maintenance: The hardware establishes field terminal connection loops through a pivot-action swing arm (1771-WH or 1771-WN). This mechanical interface allows plant electricians to slide the entire module out of the slot for inspection without disconnecting a single wire loop.

FAQs

• Is this 1771-OWNA module brand new, and does it carry original factory seals?
• Yes. We supply this 1771-OWNA module strictly in 100% brand new, original, authentic factory condition. It ships in original unopened factory boxes to verify physical integrity and complete mechanical relay lifespans.
• Can I use this contact output module to drive heavy inductive solenoid coils or motors?
• Rockwell Automation builds the 1771-OWNA primarily for switching resistive loads (Power Factor = 1.0). The module does not include internal surge-limiting snubber circuits. If you interface this card with inductive components like solenoids or contactors, you must install external suppression devices to protect the relay contacts from electrical arcing.
• Does the 1771-OWNA card draw its electrical relay power from the field lines or the chassis?
• The module pulls its logic processing power and its internal relay coil activation current directly from the 1771 chassis backplane power supply. It draws a nominal current of 1.8 Amps (up to 2.5 Amps maximum when all 32 relay coils engage simultaneously) from the +5V DC backplane line.
• What happens to the current rating of the module if my control room ambient temperature exceeds 45°C?
• The module requires linear current derating above 45 degrees Celsius. Individual outputs derate by 0.033 Amps per degree, each 8-point group derates by 0.133 Amps per degree, and the overall module current capacity derates by 0.4 Amps per degree above 45°C to protect internal traces from thermal overload.