Allen Bradley 1771-WB 12-Terminal Field Wiring Arm

Product Overview

The Allen-Bradley 1771-WB is a 12-terminal field wiring arm for PLC-5 I/O modules. It plugs onto the front of 1771 series modules to provide screw terminal connection points for field wiring, allowing module replacement without disconnecting wires.

Technical Specs

• Terminals: 12 screw terminals
• Plating: Gold-plated contacts
• Compatibility: 1771 series I/O modules requiring 12-terminal connection
• Type: Swing-arm terminal block
• Platform: PLC-5 / 1771 I/O chassis

Key Features

• Allows module removal and replacement without disturbing field wiring
• Gold-plated terminals ensure reliable, corrosion-resistant connections
• Swing-arm design provides clear access to terminals during installation
• Keyed to prevent incorrect module insertion

FAQ

• Which modules use the 1771-WB? It is used with 1771 I/O modules that require a 12-terminal wiring arm, such as the 1771-QC servo positioning assembly.
• Is the WB tin or gold plated? The 1771-WB features gold-plated terminals; the 1771-WD is the tin-plated equivalent.
• Does it include a fuse? No, the standard WB has no fuses; fused variants like the WHFB include fuse holders.

Installation Guide

1. Wire all field devices to the terminals on the wiring arm before installing the module.
2. Align the wiring arm with the module connector and press firmly until it latches.
3. Swing the arm into its operating position against the module face.
4. Verify terminal screws are torqued to specification.
5. Label each wire using the provided terminal identification strip.

Selection Tips

• Match the wiring arm to the module: check the module datasheet for the required arm (WA, WB, WC, WD, WG, WH, or WN).
• Choose gold-plated WB for low-level analog or high-reliability applications.
• Order spare arms to minimize downtime during field wiring changes.