Allen-Bradley 1771-OAN Digital Output Module | Replacement, Equivalent & Selection Guide
The Allen-Bradley 1771-OAN is an AC Digital Output Module designed for use in the PLC-5 family of programmable logic controllers. It provides 16 isolated output points operating at 120V AC, making it a standard workhorse in legacy industrial automation systems. This page serves as a comprehensive selection guide to help engineers identify direct replacements, compatible equivalents, and upgrade paths.
Technical Specifications
| Parameter | Specification |
|---|---|
| Catalog Number | 1771-OAN |
| Manufacturer | Allen-Bradley (Rockwell Automation) |
| Module Type | AC Digital Output |
| Number of Output Points | 16 |
| Output Voltage | 120V AC |
| Output Current (per point) | 1.0 A max |
| Output Current (total module) | 4.0 A max |
| Output Type | Triac (solid-state) |
| Isolation | Optical isolation between field and backplane |
| Backplane Compatibility | 1771 I/O chassis (PLC-5 platform) |
| Operating Temperature | 0°C to 60°C (32°F to 140°F) |
| Storage Temperature | -40°C to 85°C |
| Relative Humidity | 5% to 95% (non-condensing) |
| Weight | Approx. 460 g |
| Certifications | UL Listed, CE Marked |
Compatible Replacement & Equivalent Models
When the 1771-OAN is discontinued, damaged, or unavailable, the following models are commonly used as direct or near-direct replacements. Always verify wiring and firmware compatibility before substitution.
| Model | Manufacturer | Output Voltage | Points | Compatibility Notes |
|---|---|---|---|---|
| 1771-OAN | Allen-Bradley | 120V AC | 16 | Original — direct fit |
| 1771-OA | Allen-Bradley | 120V AC | 16 | Earlier revision; functionally equivalent in most applications |
| 1771-OAD | Allen-Bradley | 120/240V AC | 16 | Wider voltage range; drop-in for 120V AC systems |
| 1771-OB | Allen-Bradley | 24V DC | 16 | DC equivalent — requires wiring change |
| 1771-OBN | Allen-Bradley | 24V DC | 16 | DC replacement with similar form factor |
| IC693MDL940 | GE Fanuc | 120V AC | 16 | Cross-platform; requires chassis adapter |
Note: Cross-brand replacements require chassis and software reconfiguration. Consult your system integrator before substitution.
Why Choose the Original Model
- Proven reliability — The 1771-OAN has decades of field-proven performance in demanding industrial environments.
- Native PLC-5 compatibility — No firmware changes or adapter modules required; plug-and-play within the 1771 chassis.
- Optical isolation — Protects the backplane and CPU from field-side voltage transients and noise.
- Solid-state triac outputs — No mechanical wear, longer service life compared to relay output modules.
- Broad certification — UL Listed and CE Marked for global deployment in regulated industries.
Typical Applications
- Motor starter and contactor control in manufacturing lines
- Solenoid valve actuation in fluid handling systems
- Conveyor belt and material handling automation
- HVAC control panels and building automation
- Pump and compressor control in water treatment plants
- Legacy PLC-5 system maintenance and spare parts replenishment
System Compatibility
The 1771-OAN is designed exclusively for the Allen-Bradley 1771 I/O chassis used with the PLC-5 processor family. It is not compatible with ControlLogix (1756), CompactLogix (1769), or SLC 500 (1746) platforms without an adapter. Key compatibility points:
- Fits any 1771 single-slot I/O chassis (1771-A1B through 1771-A4B series)
- Requires 1771-WN or equivalent wiring arm for field termination
- Supported by RSLogix 5 and legacy 6200 programming software
- Not compatible with 1756 ControlLogix backplane
Selection Guide
Use the following decision tree to select the correct output module for your application:
- Existing PLC-5 system, 120V AC field devices? → 1771-OAN (this module) is the correct choice.
- Need 120V AC or 240V AC flexibility? → Consider 1771-OAD for wider voltage range.
- Migrating to 24V DC field devices? → Use 1771-OBN; update wiring accordingly.
- Upgrading platform to ControlLogix? → Use 1756-OA16 with new chassis; plan full migration.
- Need relay (dry contact) outputs? → Consider 1771-OW16 for isolated relay outputs.
- High-density requirement (>16 points per slot)? → Evaluate 1771-OAD/B series high-density variants.
Quality Assurance & Sourcing
- Authenticity guaranteed — All modules sourced from authorized distributors or verified surplus channels with full traceability.
- Pre-shipment testing — Each unit undergoes functional verification before dispatch.
- Condition options — New, factory-refurbished, and tested-used stock available; condition clearly stated on each listing.
- Warranty — 90-day replacement warranty on all units; extended warranty available on request.
- Documentation — Original Allen-Bradley datasheets and installation manuals available upon request.
How to Order
- Confirm your chassis type and available slot size (single-slot 1771 chassis required).
- Verify field wiring voltage — 120V AC for 1771-OAN.
- Check required wiring arm: 1771-WN (standard) or 1771-WB (extended).
- Add to cart or contact us for bulk/project pricing.
- Provide your PO number and shipping address at checkout.
- Lead time: In-stock units ship within 1–3 business days; special orders 5–10 business days.
For urgent requirements or project BOM support, email support@konmask.com or call +0086 19859288691.
Replacement & Compatibility FAQ
Q: Can I use the 1771-OAN in a ControlLogix chassis?
A: No. The 1771-OAN is designed for the 1771 backplane only. ControlLogix uses the 1756 platform with a different backplane architecture.
Q: Is the 1771-OAD a direct drop-in replacement for the 1771-OAN?
A: Yes, in most 120V AC applications. The OAD supports both 120V and 240V AC, so verify your field voltage and update documentation accordingly.
Q: What wiring arm does the 1771-OAN require?
A: The standard wiring arm is the 1771-WN. Confirm with your chassis documentation before ordering.
Q: Can I mix 1771-OAN modules with other 1771 I/O modules in the same chassis?
A: Yes. The 1771 chassis supports mixed I/O modules. Ensure the total chassis current budget is not exceeded.
Q: Do you provide certificates of conformance or test reports?
A: Yes, available upon request for all units. Contact us before placing your order if documentation is required for your QA process.
Q: What is the lead time for out-of-stock units?
A: Typically 5–10 business days for sourced units. Contact us for urgent project timelines.
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