Allen-Bradley 1756-WS ControlLogix Weigh Scale Module

Product Overview

The Allen-Bradley 1756-WS integrates high-precision weighing directly into the ControlLogix chassis. This dedicated weigh scale module accepts millivolt inputs from load cells and converts them into accurate weight data for your control system. It manages complex weighing tasks—such as filling, dispensing, and checkweighing—without burdening the main processor. By handling tare, zero tracking, and motion detection internally, the module ensures precise inventory control and batch processing. We supply this item as a 100% Brand New, factory-sealed unit.

Technical Specifications

Engineering Advantages

Direct Load Cell Integration
The 1756-WS connects directly to strain gauge load cells via its -0.3 to +15.3 mV input range. This direct connection eliminates the need for external signal conditioners or standalone weight controllers. The module provides the necessary excitation voltage and amplifies the weak sensor signal, reducing panel footprint and wiring complexity.

Versatile Process Control Modes
This module adapts to various industrial applications through its programmable modes. In Gross mode, it weighs the total contents of a vessel. In Net mode, it subtracts the tare weight to measure only the added material. The Rate-of-Change mode detects flow rates, allowing the system to shut off valves precisely to prevent overfilling. This flexibility supports batching, blending, and filling operations within a single hardware platform.

Ruggedized for Industrial Environments
The 1756-WS operates reliably in temperatures ranging from 0°C to 60°C. Its robust construction withstands the electrical noise and physical stress found in heavy manufacturing plants. The module mounts securely in the ControlLogix rack, locking into the backplane to ensure a stable data connection even in high-vibration environments.

FAQs

Q: What type of sensors does the 1756-WS support?
A: The module supports standard resistive bridge load cells (strain gauges) that output a millivolt signal. It accepts inputs ranging from -0.3 to +15.3 mV, covering most industrial weighing sensors.

Q: Does the 1756-WS require external power for the load cells?
A: No. The module provides the necessary excitation power (5 to 24 Volts DC) for the load cells directly through the interface. This simplifies wiring by eliminating separate power supplies for the sensors.

Q: Can I use this module for dynamic weighing applications?
A: Yes. The 1756-WS includes a "Rate-of-Change" mode specifically designed for dynamic applications. This feature allows the controller to monitor weight changes over time, which is essential for filling operations or leak detection.