Allen-Bradley 1771-WHFB Field Wiring Arm | Replacement, Equivalent & Selection Guide
The Allen-Bradley 1771-WHFB is a Field Wiring Arm designed for use with the PLC-5 I/O chassis system. It provides a reliable, removable wiring interface between field devices and I/O modules, enabling maintenance and module replacement without disturbing field wiring. This page serves as a comprehensive selection, replacement, and compatibility reference for engineers and procurement teams sourcing this component.
Technical Specifications
- Part Number: 1771-WHFB
- Manufacturer: Allen-Bradley (Rockwell Automation)
- Description: Field Wiring Arm
- Compatible Chassis: 1771 PLC-5 I/O Chassis
- Terminal Type: Screw-type field wiring terminals
- Weight: Approx. 450 g
- Mounting: Attaches directly to front of 1771 I/O modules
- Wiring Capacity: Supports standard field wiring gauges per module specification
- Country of Origin: USA
- RoHS Compliance: Consult Rockwell Automation documentation for current status
Compatible Replacement & Equivalent Models
The following models are commonly referenced as replacements or functional equivalents for the 1771-WHFB. Always verify compatibility with your specific I/O module and chassis revision before substitution.
- 1771-WN – Standard Field Wiring Arm for 1771 I/O modules (verify terminal count compatibility)
- 1771-WB – Alternative wiring arm variant; confirm module-specific fit
- 1771-WH – Similar wiring arm series; check suffix for exact terminal configuration
- Third-party equivalents – Compatible field wiring arms from approved industrial suppliers may be available; contact Konmask for sourcing assistance
Note: Suffix letters (e.g., -WH, -WN, -WB, -WHFB) denote specific terminal configurations. Always cross-reference with the module’s installation manual before ordering a replacement.
Why Choose the Original Model
- Guaranteed Fit: Factory-designed to mate precisely with 1771-series I/O modules — no adapter or modification required
- Wiring Continuity: Removable design allows module swap without disconnecting field wiring, minimizing downtime
- Rockwell Certification: Fully tested and certified within the Allen-Bradley PLC-5 ecosystem
- Long-term Support: Documented in Rockwell Automation’s official spare parts catalog for legacy PLC-5 systems
- Reliability: Proven in demanding industrial environments across decades of deployment
Typical Applications
- PLC-5 discrete and analog I/O module field wiring termination
- Manufacturing automation and process control panels
- Oil & gas, water treatment, and utilities SCADA systems
- Automotive assembly line control systems
- Legacy system maintenance, MRO (Maintenance, Repair & Operations) sourcing
- Panel builders and system integrators working with 1771-series hardware
System Compatibility
- Primary Platform: Allen-Bradley PLC-5 (1771 I/O system)
- Compatible Chassis: 1771-A1B, 1771-A2B, 1771-A3B, 1771-A4B series (verify slot width)
- Compatible Modules: 1771-series digital input, digital output, and analog I/O modules (check module datasheet for wiring arm suffix)
- Not Compatible With: ControlLogix (1756), CompactLogix (1769), SLC 500 (1746) — these platforms use different wiring arm systems
Selection Guide
Use the following criteria to confirm the correct wiring arm for your application:
- Step 1 – Identify your I/O module: Locate the module catalog number (e.g., 1771-IAD, 1771-OBD). The module’s installation manual specifies the required wiring arm suffix.
- Step 2 – Match the suffix: The suffix (e.g., -WHFB, -WN, -WB) indicates terminal count and configuration. Do not substitute suffixes without verifying terminal compatibility.
- Step 3 – Check chassis slot width: Confirm single-slot vs. double-slot module to ensure the wiring arm spans the correct width.
- Step 4 – Verify wire gauge: Ensure your field wiring gauge is within the terminal’s rated range (typically 14–22 AWG).
- Step 5 – Confirm quantity: Each I/O module requires one wiring arm. Order one 1771-WHFB per module being serviced.
Quality Assurance & Sourcing
- All units sourced by Konmask.com are inspected for physical integrity and correct labeling prior to shipment
- Products are supplied as new surplus, refurbished, or used-tested — condition is clearly stated on each listing
- Traceability documentation available upon request for critical applications
- Packaging: anti-static bag + protective carton; original Rockwell packaging where available
- Lead time: typically 1–5 business days for in-stock items; contact us for urgent requirements
How to Order
- Online: Add to cart directly from this page at Konmask.com
- Email: Send your BOM or part number to support@konmask.com
- Phone/WhatsApp: +0086 19859288691
- Bulk / OEM Pricing: Available for orders of 5+ units — contact us for a quote
- Export & International Shipping: We ship worldwide; contact us for customs documentation support
Replacement & Compatibility FAQ
Q: Can I use a 1771-WN instead of a 1771-WHFB?
A: Possibly, but you must verify that the terminal count and configuration match your specific I/O module. Refer to the module’s installation manual for the exact required wiring arm catalog number.
Q: Is the 1771-WHFB still in production?
A: The PLC-5 platform is in end-of-life status with Rockwell Automation. New production of accessories may be limited; Konmask specializes in sourcing legacy and surplus stock for ongoing maintenance needs.
Q: Can I reuse a wiring arm from another module?
A: Only if the suffix and terminal configuration are identical. Mismatched wiring arms can cause wiring errors or physical damage.
Q: Do you provide a warranty?
A: Yes. We offer a 90-day functional warranty on tested units. Terms vary by condition grade — see our Return Policy for details.
Q: Can you help me find an equivalent for a discontinued part?
A: Yes — contact our technical team with your module catalog number and we will identify the correct replacement wiring arm.
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Original Source: https://Konmask.com
Contact: support@konmask.com | +0086 19859288691
