Allen-Bradley 1771-WC 1771 I/O Field Wiring Arm

Allen-Bradley 1771-WC is a field wiring arm designed for use within the Allen-Bradley 1771 I/O system. The device connects directly to analog output modules, including the 1771-OFE series modules (such as 1771-OFE1, 1771-OFE2, and 1771-OFE3), to interface field analog output devices like valve positioners, motor speed controllers, signal converters, or recorders. It pivots on the front of the 1771 I/O chassis, attaching to the horizontal bar at the bottom, which allows modules to be installed or removed without disconnecting user field wiring.

Features

• Enables module installation and removal without disconnecting field wiring
• Pivots on the front of the 1771 I/O chassis for modular maintenance
• Attaches to the horizontal bar at the bottom of the 1771 I/O chassis
• Includes terminal screws for field wiring terminations
• Includes a functional ground connection terminal

Applications

• Interfacing 1771 analog output modules with field analog devices
• Industrial process control systems using 1771 I/O chassis installations
• Control panel wiring for valve positioners, motor speed controllers, signal converters, and recorders

Technical Specifications

Installation Guidelines

• Mounting: Attach the wiring arm to the horizontal bar at the bottom of the 1771 I/O chassis. The arm pivots upward to connect with the module.
• Power Safety: Remove power from the 1771 I/O chassis backplane and field wiring arm before removing or installing an I/O module. Disconnect and lockout AC power from the processor and system power supplies before wiring.
• Wiring & Shielding: Use Belden 8761 single insulated, twisted-pair shielded cable for signal transmission. The cable shield must extend the length of the cable and be connected only at the 1771 I/O chassis end.
• Grounding: Connect the cable shield to a properly grounded common bus or chassis ground stud at the chassis end only.