Allen-Bradley 1771-OW Relay Output Module | Replacement, Equivalent & Selection Guide
The Allen-Bradley 1771-OW is a relay output module designed for use in the PLC-5 I/O chassis (1771 series). It provides isolated relay contact outputs suitable for controlling AC/DC loads in industrial automation environments. This page serves as a comprehensive selection, replacement, and compatibility reference for engineers and procurement teams sourcing the 1771-OW or its equivalents.
Technical Specifications
- Manufacturer: Allen-Bradley (Rockwell Automation)
- Part Number / SKU: 1771-OW
- Module Type: Relay Output Module
- Series: 1771 PLC-5 I/O
- Output Type: Relay contact (isolated)
- Number of Outputs: 16 relay outputs
- Output Voltage Range: 5–265V AC/DC
- Max Load Current: 2A per output (resistive)
- Backplane Current Draw: 800 mA @ 5V DC
- Operating Temperature: 0°C to 60°C (32°F to 140°F)
- Storage Temperature: -40°C to 85°C
- Dimensions: Single-slot 1771 I/O chassis module
- Weight: Approx. 400 g
- Certifications: UL, CSA, CE
Compatible Replacement & Equivalent Models
When the 1771-OW is discontinued, hard to source, or cost-prohibitive, the following models are commonly evaluated as replacements or equivalents:
- 1771-OWN — Allen-Bradley narrow-series relay output variant; same relay type, different chassis slot width
- 1771-OX — Allen-Bradley isolated relay output, higher current rating (5A), direct upgrade path
- 1771-OXL — Extended relay output module with LED indicators per output
- 1771-OW16 — 16-point relay output, functionally equivalent in most PLC-5 applications
- Third-party compatible modules — Various OEM-compatible relay output modules designed to fit 1771 chassis; verify backplane pinout and firmware compatibility before substitution
Note: Always verify chassis slot compatibility, backplane current budget, and firmware revision before substituting any module.
Why Choose the Original 1771-OW
- ✅ Proven reliability in legacy PLC-5 installations with decades of field history
- ✅ Isolated relay contacts eliminate ground loop issues in mixed-voltage environments
- ✅ Wide voltage range (5–265V AC/DC) supports diverse load types without additional interface relays
- ✅ Drop-in fit for existing 1771 I/O chassis — no rewiring or re-programming required
- ✅ Full Rockwell Automation documentation and RSLogix 5 compatibility
Typical Applications
- Motor starter and contactor control in manufacturing lines
- Solenoid valve switching in process automation
- Pilot light and alarm annunciator control
- Conveyor and material handling system interlocks
- HVAC and building automation relay switching
- Oil & gas field panel control systems
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 1771 adapter modules
- Not compatible with: ControlLogix (1756) or CompactLogix (1769) chassis without I/O adapter bridges
Selection Guide
Use the following criteria to confirm the 1771-OW is the correct module for your application, or to select an appropriate alternative:
- Step 1 — Chassis slot type: Confirm single-slot 1771 I/O chassis availability
- Step 2 — Output count: 16 relay outputs required? → 1771-OW. Fewer outputs needed? → Consider 1771-OW8 (8-point)
- Step 3 — Load current: ≤2A resistive per point → 1771-OW. >2A or inductive loads → 1771-OX (5A rated)
- Step 4 — Voltage range: Mixed AC/DC loads → 1771-OW (5–265V). DC-only loads → consider solid-state output modules for longer contact life
- Step 5 — Migration path: Planning a ControlLogix migration? → Evaluate 1756-OW16I as the long-term replacement with POINT I/O bridge
Quality Assurance & Sourcing
All 1771-OW modules supplied by Konmask.com are:
- Sourced from authorized distributors or verified surplus channels
- Inspected for physical integrity, label authenticity, and firmware revision
- Tested for backplane communication and output relay function prior to shipment
- Shipped with anti-static packaging and full traceability documentation
- Backed by our 90-day functional warranty
How to Order
- Add the 1771-OW to your cart directly from this page
- For bulk orders (>5 units) or urgent requirements, contact us at support@konmask.com for a dedicated quote
- Specify your required firmware revision or chassis type in the order notes if applicable
- International shipping available — DDP (Delivered Duty Paid) terms available on request
Replacement & Compatibility FAQ
Q: Can the 1771-OW replace a 1771-OWN?
A: The 1771-OWN is a narrow-series variant. Physical slot width differs — confirm chassis slot type before substituting.
Q: Is the 1771-OW compatible with ControlLogix?
A: Not directly. A 1771-to-1756 I/O adapter (e.g., 1756-DHRIO with RIO scanner) is required for integration into a ControlLogix system.
Q: What is the lead time for the 1771-OW?
A: In-stock units ship within 1–3 business days. Contact us for current stock levels and expedited options.
Q: Are third-party 1771-OW equivalents reliable?
A: Quality varies significantly. Konmask.com only supplies modules that pass our functional verification process. We recommend original Allen-Bradley units for safety-critical applications.
Q: Can I use the 1771-OW with RSLogix 5000?
A: RSLogix 5000 is for ControlLogix/CompactLogix platforms. The 1771-OW is programmed via RSLogix 5 for PLC-5 systems.
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