1756-2WS: Dual-Channel Weighing for ControlLogix
When a batching or filling line stalls, every minute of downtime costs money. The Allen-Bradley 1756-2WS dual weigh scale module keeps process weighing inside the ControlLogix chassis, so you get fast, reliable weight data without extra network hardware.
Built by Hardy Process Solutions for the Allen-Bradley ControlLogix platform, this module handles two independent scales in a single slot. It reads up to eight 350 Ohm full Wheatstone bridge load cells or points, converts weight at 50 updates per second, and passes data straight to the processor over the backplane. No external Ethernet switches or routers are required, which cuts installation cost and simplifies the panel.
Technical Specifications
| Specification | Value |
|---|---|
| Product type | Dual weigh scale module |
| Series | ControlLogix |
| Compatibility | CompactLogix |
| Input voltage | -0.3 to 15.3 millivolts |
| Output voltage | 5 VDC to 8.75 VDC |
| Excitation | 5 VDC to load cells |
| Conversion rate | 50 updates per second |
| Averages | 1-255, user selectable in single increments |
| Internal resolution | 1:8,388,608 |
| Calibration | C2 Electronic / manual |
| Hot-swappable | Yes |
| Operating temperature | 32 to 140 degrees Fahrenheit |
| Weight | 0.5 kilograms |
What These Numbers Mean on the Line
The 50 updates per second conversion rate suits fast filling and dispensing, where weight changes quickly and the controller must react in real time. The 1:8,388,608 internal resolution gives you fine weighing detail for small additions. User-selectable averaging from 1 to 255 smooths readings when product flow or vibration disturbs the scale.
C2 Electronic Calibration lets you calibrate without test weights, saving setup time and avoiding production interruptions. The Wavesaver feature suppresses plant vibration effects around the scale, which protects accuracy on busy floors. Because the module is hot-swappable, you can insert or remove it under power, so a failed unit does not force a full line shutdown.
Where the 1756-2WS Fits
This module targets batching, blending, filling, dispensing, level by weight, and weight checking. In a batching plant, two channels can monitor two vessels at once while the processor runs the recipe. On a filling line, fast updates and vibration suppression keep each container on target. For level-by-weight tank monitoring, the module reports net, gross, and rate-of-change values directly to the ControlLogix processor.
Integration and Selection Notes
Because the 1756-2WS sits in the ControlLogix chassis and communicates over the backplane, it avoids extra network hardware and the wiring that comes with it. Confirm your load cell type, bridge resistance, and excitation needs before ordering. If you are matching this module to an existing weighing system, verify the current lifecycle status and availability with Oil AutoTech before you commit.
Oil AutoTech supplies fast-dispatch spares for oil, gas, and industrial automation, with quick worldwide delivery and hands-on technical selection help. Contact Oil AutoTech today for pricing and availability.
