Technical Report: 1769-2WS Dual-Channel Weigh Scale Module

1. Product Overview

The 1769-2WS is an industrial dual-channel weigh scale module designed for integration with CompactLogix and MicroLogix 1500 control systems. It is used for high-precision weight measurement applications in automated industrial environments such as batching, filling, dosing, and process weighing systems.

The module directly interfaces with strain gauge load cells and processes low-level millivolt signals, converting them into high-resolution digital data for PLC processing.

It is widely used in systems where real-time weight monitoring and control are required without the need for external weighing instruments.

2. Brand and Series Information

Brand: Allen-Bradley

Series: CompactLogix 1769 I/O Series

Module Family: 1769 Weigh Scale / Specialty Analog Module Family

Alternate designation: HI 1769-2WS (Hardy Process Solutions OEM variant)

3. Product Function and Description

The module provides:

• Dual independent weighing channels
• Direct connection to strain gauge load cells
• Signal conditioning and amplification
• High-speed weight data conversion
• PLC backplane communication

It supports both net and gross weight calculations and can also handle rate-of-change measurement for dynamic weighing applications.

The system eliminates the need for external weighing controllers by integrating directly into the PLC chassis.

4. Technical Parameters

Electrical & Signal Specifications

Mechanical Parameters

Environmental Conditions

5. Functional Features

• Dual-channel independent weighing
• Real-time signal conditioning
• High-resolution A/D conversion
• Electronic calibration capability (C2 method)
• Traditional calibration using test weights
• Noise and vibration filtering for stable readings
• Diagnostic LED indicators for system status
• Supports multiple weighing modes:
  • Net weight
  • Gross weight
  • Rate-of-change measurement

6. Application Areas

This module is typically used in:

• Industrial batching systems
• Food and beverage production lines
• Chemical processing plants
• Packaging and filling machines
• Tank and silo weighing systems
• Conveyor belt weighing systems
• Pharmaceutical manufacturing
• Material dosing and blending systems

It is especially effective in environments requiring continuous weight monitoring and high accuracy under vibration or industrial noise conditions.

7. Key Advantages

1. High Precision Measurement

The module provides ultra-high resolution (1:8 million+), enabling extremely accurate weight detection even in small load changes.

2. Direct PLC Integration

No external weighing controller is required, reducing system complexity and wiring cost.

3. Dual Channel Capability

Two independent weighing inputs allow multi-vessel or multi-point measurement in one module.

4. Fast Data Processing

100 updates per second ensures real-time response for dynamic industrial processes.

5. Strong Noise Immunity

High common-mode rejection improves stability in electrically noisy environments.

6. Flexible Calibration Methods

Supports both electronic and traditional calibration methods for maintenance convenience.

7. Industrial Robustness

Designed for harsh environments with temperature tolerance and vibration filtering.

8. Recommended Models (Same Series / Related Modules)

Related 1769 Series Modules

9. Other Popular Models (Same Brand – High Demand)

10. Summary

The 1769-2WS is a high-precision dual-channel weighing module designed for industrial automation systems requiring accurate real-time weight measurement. Its integration capability, high resolution, and strong noise immunity make it suitable for demanding process control environments.

Its main strengths lie in accuracy, system integration simplicity, and robustness in industrial conditions.