Allen-Bradley 1794-OA16 FLEX I/O Digital Output Module | Replacement, Equivalent & Selection Guide
The Allen-Bradley 1794-OA16 is a 16-point, 120V AC digital output module designed for the Rockwell Automation FLEX I/O platform. It provides reliable discrete output control for industrial automation systems, offering high-density I/O in a compact, modular form factor. Whether you are sourcing an original unit, evaluating compatible replacements, or selecting the right module for a new project, this guide covers everything you need.
Technical Specifications
| Parameter | Specification |
|---|---|
| Catalog Number | 1794-OA16 |
| Platform | Allen-Bradley FLEX I/O |
| Output Type | AC Digital Output (Triac) |
| Number of Outputs | 16 Points |
| Output Voltage Range | 74–132V AC (nominally 120V AC) |
| Output Current per Point | 0.5A continuous |
| Surge Current | 7A for 43ms (one cycle) |
| Backplane Current (5V DC) | 75 mA |
| Power Dissipation | 5.5W max |
| Operating Temperature | 0°C to 55°C (32°F to 131°F) |
| Storage Temperature | -40°C to 85°C |
| Relative Humidity | 5–95% non-condensing |
| Isolation Voltage | 250V AC continuous (group isolation) |
| Output Groups | 2 groups of 8 points |
| Wiring Style | Requires 1794-TB3 or compatible terminal base |
| Certifications | UL, CSA, CE, C-Tick |
| Weight | Approx. 200g |
Compatible Replacement & Equivalent Models
When the original 1794-OA16 is unavailable or cost-prohibitive, the following models offer functional equivalence or direct drop-in compatibility:
| Model | Brand | Outputs | Voltage | Compatibility Notes |
|---|---|---|---|---|
| 1794-OA16 | Allen-Bradley (OEM) | 16-pt AC | 120V AC | Original — direct fit |
| 1794-OA8 | Allen-Bradley | 8-pt AC | 120V AC | Half-density alternative; same platform |
| 1794-OA8I | Allen-Bradley | 8-pt AC Isolated | 120V AC | Individually isolated outputs; higher isolation |
| 1794-OB16 | Allen-Bradley | 16-pt DC | 24V DC | DC equivalent; requires voltage change |
| 1794-OB16P | Allen-Bradley | 16-pt DC Protected | 24V DC | Protected DC outputs; short-circuit rated |
| IC694MDL940 | GE Fanuc / Emerson | 16-pt AC | 120V AC | Cross-platform; requires adapter/rewiring |
| SM321 / SM322 | Siemens S7-300 | 16-pt AC/DC | 120V AC / 24V DC | Different platform; migration project only |
Note: Cross-brand replacements require engineering review of backplane compatibility, terminal base wiring, and software tag remapping.
Why Choose the Original Model
- Guaranteed Compatibility: Native FLEX I/O backplane communication — no adapter or firmware workaround required.
- Rockwell Software Integration: Full support in Studio 5000 / RSLogix 5000 with pre-built Add-On Instructions (AOIs) and electronic data sheets (EDS).
- Proven Reliability: Triac-based solid-state outputs with no mechanical wear, rated for millions of switching cycles.
- Group Isolation: Two isolated output groups reduce cross-circuit interference in mixed-load applications.
- Regulatory Compliance: UL 508 listed and CE marked for global deployment in industrial control panels.
- Long Service Life: Designed for 24/7 industrial environments with wide temperature tolerance.
Typical Applications
- Motor starter and contactor control in conveyor and material handling systems
- Solenoid valve actuation in pneumatic and hydraulic circuits
- Lighting control and alarm annunciator panels
- Pump and fan on/off control in HVAC and water treatment plants
- Discrete output control in food & beverage packaging lines
- Machine tool auxiliary output control (coolant, lubrication, clamping)
- OEM equipment with Allen-Bradley FLEX I/O architecture
System Compatibility
The 1794-OA16 is compatible with the following Allen-Bradley FLEX I/O adapters and controllers:
- Adapters: 1794-AENT (EtherNet/IP), 1794-ADN (DeviceNet), 1794-APB (PROFIBUS), 1794-ACN15 (ControlNet), 1794-ASB (Remote I/O)
- Terminal Bases: 1794-TB3, 1794-TB3S, 1794-TB32, 1794-TBN (verify group wiring requirements)
- Controllers: ControlLogix (1756), CompactLogix (1769), MicroLogix 1500 (via adapter), SLC 500 (via adapter)
- Software: Studio 5000 Logix Designer v21+, RSLogix 5000, RSNetWorx
Selection Guide
Use the following criteria to confirm the 1794-OA16 is the right module for your application, or to identify a better-fit alternative:
- Output Voltage: If your field devices operate at 120V AC, the OA16 is correct. For 24V DC devices, select 1794-OB16 or 1794-OB16P instead.
- Point Count: 16 outputs per module. If you need fewer points or individual isolation per output, consider 1794-OA8I.
- Current Load: Each output supports 0.5A continuous. For higher-current loads (e.g., large contactors), use an interposing relay.
- Isolation Requirement: The OA16 provides group isolation (8+8). For point-to-point isolation, select 1794-OA8I.
- Network Protocol: Choose the matching adapter (AENT for EtherNet/IP, ADN for DeviceNet, etc.) — the I/O module itself is protocol-agnostic.
- Environment: Standard industrial rating (IP20 equivalent). For harsh or washdown environments, consider enclosure-level protection.
Quality Assurance & Sourcing
- Authenticity: All units sourced through verified industrial distributors and authorized supply chains. Counterfeit screening performed on every batch.
- Condition Options: New-in-box (NIB), factory-refurbished, and tested-used units available — clearly labeled on each listing.
- Testing: Functional power-on and I/O point verification performed prior to shipment.
- Warranty: 12-month warranty on new units; 90-day warranty on refurbished and used units.
- Documentation: Original Rockwell Automation datasheets and installation instructions included or available on request.
- Export Compliance: EAR99 classified; standard export documentation provided for international orders.
How to Order
- Confirm your catalog number: 1794-OA16 (Series A, B, or C — specify if required).
- Specify quantity and preferred condition (new / refurbished / used).
- Add to cart and proceed to checkout, or contact us for bulk pricing and lead time confirmation.
- For urgent requirements, email support@konmask.com with your PO number and required delivery date.
- International orders: provide your import license or end-user certificate if required by your country’s regulations.
Replacement & Compatibility FAQ
Q: Can I replace a 1794-OA16 with a 1794-OB16 without rewiring?
A: No. The OA16 is an AC output module (120V AC triac) and the OB16 is a DC output module (24V DC transistor). Field wiring, power supply, and load devices must all be changed accordingly.
Q: Is the 1794-OA16 compatible with ControlLogix 1756 systems?
A: Yes, via a FLEX I/O adapter (e.g., 1794-AENT on EtherNet/IP). The module communicates through the adapter to the ControlLogix backplane.
Q: What terminal base does the 1794-OA16 require?
A: The 1794-TB3 is the standard 3-wire terminal base. The 1794-TB3S adds a shield terminal. Verify your wiring group configuration before ordering.
Q: Can I use a third-party equivalent from Siemens or GE?
A: Functionally possible in a migration scenario, but not a drop-in replacement. Different backplane protocols, terminal bases, and software configurations are required. Recommended only for full platform migrations with engineering support.
Q: Do you supply Series A, B, and C variants?
A: Yes. Please specify the series revision in your order if your application requires a specific hardware revision for firmware compatibility.
Q: What is the lead time for the 1794-OA16?
A: In-stock units ship within 1–3 business days. For large quantities or specific series revisions, contact us for lead time confirmation.
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