Evaluating the 1756-2WS for Your Weighing Needs
When selecting a weigh scale module for a ControlLogix system, engineers need a reliable solution that integrates seamlessly and delivers accurate measurements. The Allen-Bradley 1756-2WS, designed by Hardy Process Solutions, is a dual weigh scale module that occupies one slot in the chassis. It supports up to eight load cells or points, making it suitable for applications like batching, blending, filling, dispensing, level by weight, and weight checking.
This buyer's guide helps you assess whether the 1756-2WS meets your specific requirements. We focus on its technical specifications, compatibility, and real-world value, using only verified data from the manufacturer.
Key Technical Specifications to Consider
The 1756-2WS operates with an input voltage range of -0.3 to 15.3 millivolts and provides an output voltage of 5 Volts DC to 8.75 Volts DC. It delivers 5V DC excitation to up to four 350 Ohm full Wheatstone bridges, which translates to eight load cells or points on one vessel. The conversion rate is 50 updates per second, and the internal resolution is 1:8,388,608.
Users can select averages from 1 to 255 in single increments. The module draws less than 0.0125 Amps at 24 Volts DC and less than 1 Amp from the chassis backplane at 5 Volts DC. Its operating temperature range is 32 to 140 degrees Fahrenheit, and it weighs 0.5 kilograms. These parameters directly affect performance in different environments.
Compatibility and Integration with ControlLogix
The 1756-2WS is designed for the Allen-Bradley ControlLogix platform and is also compatible with CompactLogix systems. It collects data from load cells or sensors and transmits the information to the ControlLogix processor over the chassis backplane. This design eliminates the need for external Ethernet switches and routers, reducing installation costs and enhancing speed.
The module supports hot-swapping, meaning you can insert or remove it under power without shutting down the system. This feature minimizes downtime during maintenance or upgrades. For calibration, the 1756-2WS offers C2 Electronic Calibration, which allows calibration without test weights, and also supports traditional calibration using test weights.
Application Scenarios and Use Cases
In batching applications, the 1756-2WS helps maintain precise ingredient proportions by providing fast, accurate weight data. Its 50 updates per second conversion rate ensures real-time control. For blending operations, the module's ability to average readings from 1 to 255 samples reduces the impact of vibration or material movement.
In a typical filling line, the 1756-2WS can monitor weight changes and trigger actions when targets are reached. The Wavesaver feature eliminates the effects of plant vibration around the scale, improving measurement stability. These capabilities make the module suitable for industries such as food and beverage, chemicals, and pharmaceuticals.
Business Value and ROI Considerations
Investing in the 1756-2WS can reduce total cost of ownership by simplifying system architecture. Because it integrates directly into the ControlLogix backplane, you avoid the expense of additional networking hardware. The hot-swappable design also reduces unplanned downtime during module replacement.
The module's C2 Electronic Calibration saves time and labor by eliminating the need to handle test weights. For facilities that require frequent recipe changes, the user-selectable averaging and multiple weighing modes (net, gross, and rate-of-change) provide flexibility without additional programming.
Frequently Asked Questions About the 1756-2WS
What is the input voltage range of the 1756-2WS?
The 1756-2WS accepts input signals ranging from -0.3 to 15.3 millivolts. This range accommodates typical strain gauge load cell outputs.
How many load cells can the 1756-2WS support?
The module supports up to eight 350 Ohm full Wheatstone bridge load cells or points on one vessel. It provides 5V DC excitation to these sensors.
Does the 1756-2WS support hot-swapping?
Yes, the 1756-2WS supports hot-swapping, also known as insertion and removal under power. This allows you to replace the module without powering down the ControlLogix chassis.
What calibration methods are available for the 1756-2WS?
The module supports C2 Electronic Calibration, which enables calibration without test weights, as well as traditional calibration using test weights. Both methods are user-selectable.
What is the operating temperature range for the 1756-2WS?
The operating temperature range is 32 to 140 degrees Fahrenheit. The transportation and storage temperature range is -40 to 185 degrees Fahrenheit.
Why Choose AutoDCSTech for Your 1756-2WS
AutoDCSTech offers the Allen-Bradley 1756-2WS with verified specifications and reliable supply. Our team understands industrial automation and can help you confirm compatibility with your existing ControlLogix system. Please verify current lifecycle status and availability with AutoDCSTech before ordering.
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