Allen-Bradley 1771-NOV Analog Output Module | Replacement, Equivalent & Selection Guide
The Allen-Bradley 1771-NOV is a voltage analog output module designed for use in Rockwell Automation PLC-5 I/O chassis systems. It provides precision analog voltage output signals for process control applications. This page serves as a comprehensive selection, replacement, and compatibility reference for industrial automation engineers and procurement teams.
Technical Specifications
- Part Number: 1771-NOV
- Manufacturer: Allen-Bradley / Rockwell Automation
- Module Type: Analog Output (Voltage)
- Series: PLC-5 / 1771 I/O
- Output Channels: 4 channels
- Output Signal Range: 0–10 VDC / ±10 VDC (selectable)
- Resolution: 12-bit
- Output Impedance: ≤ 1 kΩ load
- Power Consumption: 1771 I/O chassis backplane powered
- Isolation: Channel-to-backplane isolation
- Operating Temperature: 0°C to 60°C (32°F to 140°F)
- Dimensions: Standard 1771 single-slot module
- Weight: Approx. 800 g
- Certifications: UL Listed, CE Marked
Compatible Replacement & Equivalent Models
When the 1771-NOV is discontinued or unavailable, the following models are commonly evaluated as replacements or equivalents. Always verify electrical and software compatibility before substitution:
- 1771-NOA – Allen-Bradley analog output module (current output variant, 4–20 mA); direct platform equivalent for current-output applications
- 1771-OFE1 – Allen-Bradley enhanced analog output module; improved resolution and diagnostics, drop-in chassis fit
- 1771-OFE2 – 8-channel enhanced analog output; suitable when channel expansion is needed
- 1756-OF4 (ControlLogix) – Next-generation platform migration option; requires chassis and software migration
- 1769-OF4 (CompactLogix) – Compact platform alternative for system modernization projects
- Third-party equivalents: Spectrum Controls, ProSoft Technology, and other 1771-compatible I/O vendors may offer functional equivalents — confirm firmware and ladder logic compatibility
Why Choose the Original 1771-NOV
- Guaranteed compatibility with existing PLC-5 programs and 1771 I/O chassis — no re-engineering required
- Proven reliability in legacy process control environments (chemical, oil & gas, utilities)
- Supports existing RSLogix 5 / PLC-5 programming without migration overhead
- Sourced from verified supply chains to ensure authentic, non-counterfeit hardware
- Ideal for plant maintenance, spare parts inventory, and MRO procurement
Typical Applications
- Analog voltage setpoint control for drives, valves, and positioners
- Process control loops in DCS/PLC hybrid architectures
- Legacy system maintenance and spare parts replacement
- Industrial automation in manufacturing, water treatment, and energy sectors
- OEM machine control panels using PLC-5 platforms
System Compatibility
- Compatible Chassis: 1771-A1B, 1771-A2B, 1771-A3B, 1771-A4B series I/O chassis
- Compatible Controllers: PLC-5/10, PLC-5/15, PLC-5/20, PLC-5/25, PLC-5/30, PLC-5/40, PLC-5/60, PLC-5/80
- Programming Software: RSLogix 5, 6200 Series Programming Software
- Communication: DH+, Remote I/O (RIO) via PLC-5 controller
- Not compatible with: 1746 (SLC 500), 1756 (ControlLogix), or 1769 (CompactLogix) chassis without adapter modules
Selection Guide
Use the following criteria to select the correct analog output module for your application:
- Output signal type: Choose 1771-NOV for voltage output (0–10 V / ±10 V); choose 1771-NOA for current output (4–20 mA)
- Channel count: 1771-NOV provides 4 channels; upgrade to 1771-OFE2 for 8 channels
- Resolution requirement: Standard 12-bit (1771-NOV) vs. enhanced 13-bit (1771-OFE1/OFE2)
- Platform migration: If migrating from PLC-5 to ControlLogix, evaluate 1756-OF4 with appropriate migration tools
- Budget vs. availability: Refurbished/surplus 1771-NOV units are cost-effective for maintenance; new OFE series for long-term projects
Quality Assurance & Sourcing
- All modules are inspected and tested prior to shipment
- Sourced from authorized distributors and verified surplus channels
- Anti-counterfeit verification available upon request
- Warranty: 90-day functional warranty on all units
- Certificates of conformance and test reports available for critical applications
How to Order
- Part Number: 1771-NOV
- Minimum Order: 1 unit
- Lead Time: In-stock units ship within 1–3 business days; sourced units 5–15 business days
- Payment: T/T, PayPal, credit card accepted
- Shipping: DHL, FedEx, UPS worldwide; EXW Xiamen available
- Contact: support@konmask.com | +0086 19859288691
- Request a Quote: Submit RFQ via our contact page
Replacement & Compatibility FAQ
Q: Can the 1771-OFE1 directly replace the 1771-NOV?
A: Yes, the 1771-OFE1 fits the same 1771 chassis slot and is backward compatible with PLC-5 systems. It offers enhanced diagnostics and slightly higher resolution. Verify your ladder logic output scaling before swapping.
Q: Is the 1771-NOV still in production?
A: The 1771-NOV has been discontinued by Rockwell Automation. Konmask.com sources surplus and refurbished units from verified supply chains.
Q: Can I use a 1756-OF4 (ControlLogix) as a replacement?
A: Not directly — the 1756 series uses a different chassis and programming environment. A full platform migration project is required. Contact us for migration consulting.
Q: What is the difference between 1771-NOV and 1771-NOA?
A: The 1771-NOV outputs voltage signals (0–10 VDC / ±10 VDC), while the 1771-NOA outputs current signals (4–20 mA). Select based on your field device input requirements.
Q: Do you provide test reports for the 1771-NOV?
A: Yes. Functional test reports and certificates of conformance are available upon request for critical procurement.
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