1771-WI A-B dedicated Field Wiring Arm belonging to the iconic PLC-5 platform

1771-WI A-B dedicated Field Wiring Arm belonging to the iconic PLC-5 platform

Packaging & Delivery

Product Details

The Allen-Bradley 1771-WI is a dedicated Field Wiring Arm belonging to the iconic PLC-5 platform. In the 1771 I/O architecture, wiring arms act as a vital bridge between the physical field devices (sensors, actuators, thermocouples) and the electronic I/O modules plugged into the chassis.

Rather than wiring directly to the expensive, sensitive electronic module, cables are terminated at the 1771-WI wiring arm, which pivots directly onto the front of the I/O module. This specific wiring arm model features 18 terminals and gold-plated contacts, which are engineered specifically for low-voltage, low-current signals such as thermocouple inputs.

Technical Parameters

Feature / Metric	Specification
Model Number	1771-WI
Product Family	PLC-5 / 1771 I/O System
Component Type	Field Wiring Arm (Non-fused)
Number of Terminals	18 screw terminals
Contact Plating	Gold-plated (Optimized for low-level signals)
Typical Target Module	1771-IX series (Thermocouple / Millivolt input modules)
Terminal Screw Torque	7 to 9 lb-in (0.8 to 1.0 N-m)
External Power Requirement	None (Passive mechanical interface)
Environmental Protection	Conformal Coated variants available (for harsh atmospheres)
Weight	~0.31 lbs (0.14 kg)

Product Advantages

• Tool-Free Module Replacement (Hot-Swapping Support): The wiring arm remains anchored to the 1771 I/O chassis during servicing. If an electronic card fails, you simply pivot the wiring arm away, swap the module, and snap the arm back on—without removing a single field wire.

• Gold-Plated Contact Interface: Because it uses gold plating rather than standard tin, it prevents contact oxidation. This is critical for micro-volt or milli-volt signals (like thermocouples), where even slight corrosion resistance could ruin measurement accuracy.

• Reduces Costly Wiring Flaws: By completely decoupling field terminations from the module hardware, it prevents the miswiring issues commonly encountered when updating or repairing automation backplanes.

• Extremely Long Legacy Lifespan: Built to meet rugged, industrial-grade standards, the 1771 mechanical assembly handles severe vibrations and thermal cycles seamlessly.

1. Match the Module Variant

• The 1771-WI features 18 terminals and gold contacts. Do not force this wiring arm onto a standard 1771 I/O module that requires a 20-terminal or 40-terminal layout (such as the 1771-WN). Forcing an incorrect arm can damage both the terminal block teeth and the guide pins on the module.

2. Guard Against Stray Signals (Shielding)

• When routing low-voltage thermocouple wires into the 1771-WI terminals, ensure that proper shielding and twisted-pair wiring rules are strictly observed. Keep these low-power lines physically isolated from high-voltage motor starters or AC wiring conduits inside the cabinet to prevent electromagnetic interference (EMI).

3. Lifecycle & Obsolescence Warning

System Status Note: The entire Allen-Bradley 1771 / PLC-5 platform has been discontinued by Rockwell Automation. New parts are no longer manufactured. For ongoing operation, these components must be managed through certified industrial surplus, factory-refurbished stock, or migration plans to ControlLogix 1756 platforms.

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