Allen-Bradley 1771-WH PLC Field Wiring Arm 21-Terminals No Cover

Overview

The Allen-Bradley 1771-WH is a robust field wiring arm engineered for PLC-5 I/O systems. Designed without a cover, it provides 21 tin-plated terminals to support up to 16 isolated I/O modules. Its conformal coating ensures long-term reliability in industrial environments while maintaining accurate signal transmission with minimal delay.

Technical Specifications

• Manufacturer: Allen-Bradley

• Model Number: 1771-WH

• Product Type: Field Wiring Arm

• Category: PLC Accessories

• Maximum I/O Modules: 16

• Number of Terminals: 21

• Contact Plating: Tin

• Screw Torque: 7–9 lb·in

• Coating: Conformal coated

• External Power Required: None

• Signal Delay:

• AC Off: 29 ± 8 ms

• DC Off: 30 ± 7 ms

• Compatible Wiring Arm Replacement: 1771-WN

• Weight: 0.20 kg (0.44 lbs)

Key Features

• Supports high-density I/O connections with 21 terminals

• Tin-plated contacts provide reliable conductivity

• Conformal coating safeguards against moisture and dust

• Self-powered, no external power source needed

• Compatible with general-purpose PLC-5 I/O modules

Application Scenarios

• Ideal for wiring PLC-5 modules in industrial automation

• Suitable for applications requiring multiple isolated I/O modules

• Can be used to replace or upgrade older 1771 series wiring arms

• Supports accurate AC/DC signal processing for process control systems

FAQ

Q1: How many I/O modules can the 1771-WH handle?
A1: It supports up to 16 general-purpose isolated I/O modules.

Q2: Is a cover included with this wiring arm?
A2: No, the 1771-WH model is supplied without a cover.

Q3: Does it require external power?
A3: No, the wiring arm operates without external power.