1771-WN | Allen-Bradley PLC-5 I/O Field Wiring Arm, 32-Point (Max), 40 Terminals

The Allen-Bradley 1771-WN is a wiring arm specifically designed to connect field wiring to 1771 series I/O modules in PLC-5 systems. It provides a secure terminal interface that simplifies both installation and maintenance. By allowing direct connection without altering module internals, it helps minimize downtime during module swaps or service. This component is essential for creating organized, efficient control panels in industrial automation systems.

The 1771-WN is compatible with all standard Allen-Bradley 1771 series I/O modules. This includes digital and analog cards used in PLC-5 systems. It supports up to 32 I/O points and interfaces with modules through a plug-style front connection. Always verify the module’s terminal configuration to ensure alignment with the arm’s terminal layout.

Installation involves:

1. Aligning the wiring arm with the front face of a compatible 1771 I/O module
2. Attaching it using the integrated latch system
3. Securing all field wiring to the 40 screw terminals with 7–9 lb·in torque
4. Verifying each connection point and labeling wires if required

No special tools are needed beyond a torque screwdriver.

The 1771-WN does not actively process signals but may introduce minor delay due to physical wiring characteristics. Typical delays:

• AC Signal Off Delay: ~29 ±8 ms
• DC Signal Off Delay: ~30 ±7 ms

These values are minimal and within normal operating ranges for PLC-5 systems.

While primarily designed for digital applications (10–32V DC), the 1771-WN can be used with certain analog modules in the 1771 series if the terminal configuration aligns. However, some analog modules may require different wiring arm models optimized for signal type or isolation. Always check the module’s datasheet for wiring compatibility.