1794-OA16 16-Point AC Digital Output Module | Allen-Bradley Flex I/O Series

Global PLC Spare HUB's Insight

The 1794-OA16 is a cornerstone component of the Rockwell Automation Flex I/O distributed architecture. Our technical experts highlight its extreme versatility in handling inductive AC loads, such as contactors and sirens. Because the channels are non-isolated, this module is exceptionally compact, making it the primary choice for space-constrained industrial control cabinets where high-density 120VAC output switching is required.

Application Suitability and Diagnostic Capability

• Suitable Equipment: Compatible with all 1794 Flex I/O communication adapters for seamless integration into Logix or legacy PLC systems.
• Core Applications: Energizing AC relay coils, solenoid-actuated valves, contactor control, and high-visibility industrial alarm signaling (horns/buzzers).
• Diagnostic Capability: Features 16 dedicated yellow LED status indicators for per-channel output verification, allowing maintenance staff to pinpoint signal faults instantly without secondary diagnostic tools.

Technical Specifications

• Brand: Allen-Bradley (Rockwell Automation)
• Model: 1794-OA16
• Output Type: 16-Channel Non-isolated Digital AC Output
• Voltage Range: 74 to 132 VAC (120 VAC Nominal)
• Current Rating: 0.5A per channel (4.0A total module current)
• Scan Delay: ½ AC cycle (Off-to-On/On-to-Off)
• Power Dissipation: 4.7 Watts at 0.5A maximum
• Environmental: 0 to 55°C operating range; 5G vibration resistance

Configuration Breakdown (Flex I/O Series)

• 1794: Flex I/O Platform Base
  • OA: AC Digital Output Module
  • 16: 16-Channel Density Configuration

Logistics and Warranty Assurance

• Shipping Partners: Secure and priority worldwide transit via FedEx, UPS, or DHL.
• Dispatch: Rapid order fulfillment with 24-48 hour processing.
• Warranty: Protected by our industry-standard 12-month quality and performance guarantee.

Engineering Frequently Asked Questions

Q: Why is external fusing required with the 1794-TBNF base, but not others?
A: The 1794-TBNF base includes integrated fuse holders specifically designed to protect the non-isolated outputs of the 1794-OA16; using a non-fused base (like the TBN) necessitates external circuit protection to satisfy electrical safety codes.

Q: How does the "non-isolated" nature of this module affect my wiring strategy?
A: Because outputs are non-isolated, all channels share a common return path to the AC source; ensure your common wiring is correctly sized for the aggregate load and avoid mixing different voltage phases within the same module.

Q: Selection Guide: How do I choose the right terminal base for my cabinet space?
A: If you require integrated fusing, opt for the 1794-TBNF. For standard space-saving applications, the 1794-TB2 or TB3 offers a smaller footprint, but remember you must provide your own independent overcurrent protection.

Q: Experience Tip: What causes the 2.25 mA off-state leakage current?
A: This is a byproduct of the module's internal snubbing circuitry; be cautious when using this module to drive very low-power loads, as this leakage current can sometimes keep sensitive indicators or relays energized even when commanded "OFF."

Q: What is the most efficient way to maintain the 1794-OA16 in high-vibration environments?
A: Regularly inspect the terminal base-to-module locking mechanism. The 5G vibration rating is contingent upon the module being securely seated and the keyswitch correctly positioned (Position 8) to prevent accidental mismating.

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