1771-WA | Allen-Bradley Field Wiring Arm
The Allen-Bradley 1771-WA is a general-purpose 10-terminal field wiring swing arm engineered for the 1771 I/O chassis system. It provides a quick-disconnect wiring interface for up to 8-point digital AC and DC I/O modules, enabling maintenance personnel to swap modules without removing individual field conductors. Operating across a wide 24 to 220 V AC/DC voltage spectrum, the 1771-WA ensures secure wiring connections and reduces equipment downtime during system servicing.
Modular Swing Arm Mechanism
The 1771-WA connects directly to the pivot bar at the bottom of a 1771 I/O chassis slot. It swings upward to latch onto the front of the installed module, mating field wiring directly with the module's terminal pins. When replacing or inspecting hardware, technicians release the locking tab and swing the arm away from the module. This design retains the complete field cable harness, eliminating re-wiring errors and preserving loop integrity.
Terminal Layout & Electrical Parameters
The unit features 10 screw-clamp terminals: terminals 0 through 7 serve as 8 individual I/O signal connection points, terminal A accommodates power high (L1/+DC), and terminal B handles return low (L2/Common Return). The terminal contact plating consists of 9 tin-plated contacts and 1 gold-plated contact to ensure high-conductivity signal transfer across a 24 to 220 V AC/DC voltage range. Recommended screw terminal tightening torque is 7–9 in-lb (0.8–1.0 N·m).
| Parameter | Specification |
|---|---|
| Model | 1771-WA |
| Brand | Allen-Bradley |
| Product Type | Field Wiring Swing Arm |
| System Compatibility | 1771 I/O Chassis Platform |
| Number of Terminals | 10 (Terminals 0-7, A, B) |
| Supported I/O Points | 8 Points |
| Voltage Rating | 24 - 220 V AC/DC |
| Contact Plating | 9 Tin-Plated / 1 Gold-Plated |
| Terminal Screw Torque | 7 - 9 in-lb (0.8 - 1.0 N·m) |
| Weight | 0.07 kg |
Frequently Asked Questions
Q: Which Allen-Bradley modules use the 1771-WA field wiring arm? A: The 1771-WA is used with general-purpose 8-point 1771 digital I/O modules operating on AC or DC control voltages, such as the 1771-IA, 1771-IB, 1771-OA, and 1771-OB.
Q: What is the purpose of terminals A and B on the 1771-WA arm? A: Terminal A is dedicated to incoming supply voltage (L1 or +DC), while terminal B connects to the common return path (L2 or -DC), leaving terminals 0 through 7 for field device signals.
1771-WA | Allen-Bradley Field Wiring Arm
1771-WA | Allen-Bradley Field Wiring Arm
The Allen-Bradley 1771-WA is a general-purpose 10-terminal field wiring swing arm engineered for the 1771 I/O chassis system. It provides a quick-disconnect wiring interface for up to 8-point digital AC and DC I/O modules, enabling maintenance personnel to swap modules without removing individual field conductors. Operating across a wide 24 to 220 V AC/DC voltage spectrum, the 1771-WA ensures secure wiring connections and reduces equipment downtime during system servicing.
Modular Swing Arm Mechanism
The 1771-WA connects directly to the pivot bar at the bottom of a 1771 I/O chassis slot. It swings upward to latch onto the front of the installed module, mating field wiring directly with the module's terminal pins. When replacing or inspecting hardware, technicians release the locking tab and swing the arm away from the module. This design retains the complete field cable harness, eliminating re-wiring errors and preserving loop integrity.
Terminal Layout & Electrical Parameters
The unit features 10 screw-clamp terminals: terminals 0 through 7 serve as 8 individual I/O signal connection points, terminal A accommodates power high (L1/+DC), and terminal B handles return low (L2/Common Return). The terminal contact plating consists of 9 tin-plated contacts and 1 gold-plated contact to ensure high-conductivity signal transfer across a 24 to 220 V AC/DC voltage range. Recommended screw terminal tightening torque is 7–9 in-lb (0.8–1.0 N·m).
| Parameter | Specification |
|---|---|
| Model | 1771-WA |
| Brand | Allen-Bradley |
| Product Type | Field Wiring Swing Arm |
| System Compatibility | 1771 I/O Chassis Platform |
| Number of Terminals | 10 (Terminals 0-7, A, B) |
| Supported I/O Points | 8 Points |
| Voltage Rating | 24 - 220 V AC/DC |
| Contact Plating | 9 Tin-Plated / 1 Gold-Plated |
| Terminal Screw Torque | 7 - 9 in-lb (0.8 - 1.0 N·m) |
| Weight | 0.07 kg |
Frequently Asked Questions
Q: Which Allen-Bradley modules use the 1771-WA field wiring arm? A: The 1771-WA is used with general-purpose 8-point 1771 digital I/O modules operating on AC or DC control voltages, such as the 1771-IA, 1771-IB, 1771-OA, and 1771-OB.
Q: What is the purpose of terminals A and B on the 1771-WA arm? A: Terminal A is dedicated to incoming supply voltage (L1 or +DC), while terminal B connects to the common return path (L2 or -DC), leaving terminals 0 through 7 for field device signals.
