1771-WS | Allen-Bradley | PLC-5 Weigh Scale Module

Product Description

The 1771-WS weigh scale module from Allen-Bradley is designed for PLC-5 controllers and the 1771 Series I/O chassis. This module provides precise weight measurement capabilities for industrial automation systems, integrating seamlessly into process control applications. With strong common mode rejection and reliable backplane current support, the 1771-WS ensures accurate data acquisition even in electrically noisy environments.

Technical Specifications

• Manufacturer: Allen-Bradley

• Part Number: 1771-WS

• Product Line: PLC-5 / 1771 Series I/O

• Product Type: Weigh Scale Module

• Weight: 1.25 lbs (0.57 kg)

• Input Power: 5 V DC

• Backplane Current Draw: 1.5 A

• Compatible Chassis: 1771-A1B, -A2B, -A3B, -A3B1, -A4B, 1771-AM1, -AM2

• Operating Temperature: 0–60 °C

• Storage Temperature: -40–85 °C

• Humidity Range: 0–90% non-condensing

• Common Mode Rejection: 100 dB

• Enclosure Type: Open-style

Key Features

• High Accuracy: Designed for precise weight measurement in industrial processes

• Strong Noise Immunity: 100 dB common mode rejection ensures reliable performance

• Wide Compatibility: Works with multiple 1771 chassis models

• Compact Design: Lightweight and easy to install in rack-mounted systems

• Industrial Durability: Operates across wide temperature and humidity ranges

Application Scenarios

• Batch processing in chemical and pharmaceutical industries

• Food and beverage production requiring precise weight monitoring

• Power generation and utility systems with integrated weigh scale functions

• Manufacturing automation with PLC-5 controllers

FAQ

Q: Which chassis are compatible with the 1771-WS?  A: It supports 1771-A1B, A2B, A3B, A3B1, A4B, AM1, and AM2 chassis.

Q: What is the backplane current requirement?  A: The module requires 1.5 A at 5 V DC.

Q: Can this module operate in high humidity environments?  A: Yes, it supports up to 90% relative humidity without condensation.

Comparison with Similar Models

• 1771-WS: Standard weigh scale module for PLC-5 systems

• 1771-IFE: Analog input module for current/voltage signals (non-weighing applications)