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Real-World Use & Application Scenarios
In industries demanding accurate process control over material quantities and weights, the Allen-Bradley 1756-2WS dual weigh scale module provides the precision and reliability needed. It is commonly deployed in manufacturing sectors engaged in ingredient batching, material loading, and product packaging where weight measurement accuracy directly impacts quality and compliance. This module is also key in monitoring fill levels in tanks and silos, ensuring product consistency and safety.
- 1756-2WS
- 1756-2WS
The 1756-2WS module supports simultaneous weighing from two independent weigh scales, enabling streamlined operation in processes requiring dual measurement points such as multi-hopper batching or dual-stream blending. It helps address challenges like vibration-induced signal noise and the need for prompt calibration, featuring proprietary algorithms like WAVERSAVER® and C2® Electronic Calibration for enhanced stability and accuracy. Its seamless integration with the ControlLogix system using EtherNet/IP ensures real-time data acquisition crucial for automated control systems.
Product Introduction & Positioning
The Allen-Bradley 1756-2WS is a two-channel weigh scale input module engineered by Hardy Process Solutions to fit directly into ControlLogix chassis. It supports up to four load cells per channel with 5V DC excitation voltage, providing flexibility across a wide range of industrial scale setups. The module enhances control system capabilities by digitizing analog weight signals and providing diagnostic data, enabling precise control and monitoring functions.
Engineers appreciate the 1756-2WS for its advanced signal processing technologies designed to minimize signal interference and reduce calibration effort through electronic means. It integrates tightly with Rockwell Automation’s RSLogix 5000 software, enabling intuitive programming, setup, and diagnostics. This module is positioned as a high-accuracy weight measurement solution for control and batch systems requiring dependable performance and regulatory compliance.
Key Technical Features & Functional Benefits
The 1756-2WS supports a wide input range for strain gauge load sensors (-0.3 mV to +15.3 mV) with 5V DC excitation provided to up to four load cells per channel. Its high resolution achieves over 1 million counts, allowing extremely fine weight measurement differentiation and improved process control accuracy. The module digitizes weight signals at rates up to 110 times per second, keeping pace with dynamic weighing processes.
WAVERSAVER® technology enables dynamic compensation under vibration and environmental disturbances, enhancing signal stability and reducing false weight fluctuations. C2® Electronic Calibration eliminates the need for test weights, shortening calibration time and improving operational efficiency. Its diagnostic capabilities allow continuous monitoring of sensor integrity and module health, minimizing downtime through predictive maintenance.
The module operates reliably in temperatures from 0°C to 60°C with storage capability down to -40°C and supports up to 90% non-condensing humidity. Its compact form factor fits standard ControlLogix chassis slots and consumes minimal backplane power, simplifying system design and integration. Compliance with UL and CUL standards assures suitability for hazardous locations and industrial installations worldwide.
Detailed Technical Specifications
| Parameter | Value |
|---|---|
| Model | 1756-2WS |
| Brand | Allen-Bradley |
| Product Type | Dual Weigh Scale Input Module |
| Channels | 2 Independent weigh scale channels |
| Load Cell Excitation Voltage | 5 V DC |
| Input Signal Range | -0.3 mV to +15.3 mV |
| Resolution | Over 1 million counts |
| Signal Processing Rate | Up to 110 updates per second |
| Calibration Technology | C2® Electronic and Manual |
| Vibration Compensation | WAVERSAVER® technology |
| Operating Temperature | 0 to 60 °C |
| Storage Temperature | -40 to 85 °C |
| Relative Humidity | 5 to 90%, non-condensing |
| Communications | EtherNet/IP integration |
| Certifications | UL, CUL, CE |
| Dimensions (HxWxD) | Standard ControlLogix module size |
| Power Consumption | <5 Watts from ControlLogix backplane |
Related Modules or Compatible Units
Allen-Bradley 1756-WS – Single weigh scale module for simpler weighing applications.
Allen-Bradley 1756-L62 – Load cell interface module supporting up to 8 load cells.
Allen-Bradley 1769-IF4 – Analog input module for integration with ControlLogix I/O platforms.
Allen-Bradley 1769-OB16 – Digital output module used alongside weighing modules for control actions.
Allen-Bradley 1756-L55 – Analog output module complementing weigh scale input modules for closed-loop control.
Installation Notes & Maintenance Best Practices
When installing the 1756-2WS, position the module within a ControlLogix chassis that provides suitable ventilation and stable operating temperatures between 0°C and 60°C. Use shielded cables for load cell wiring to minimize noise interference and ensure the accuracy of weight measurements. Confirm power supply voltage and polarity according to specification to avoid damage to the module.
Routine maintenance involves periodic inspection of load cells, cable connections, and calibration status. Utilize the module’s electronic calibration tools regularly to maintain accuracy without disrupting operation. Monitor diagnostic outputs for signs of sensor degradation or module faults, enabling timely corrective measures to maintain system uptime. Keep the module clean and dry and apply software updates to benefit from enhanced functionality and security.
