Product Details
Product Overview
The Allen-Bradley 1756-2WS serves as a high-precision interface for industrial load cells and strain gauges within the ControlLogix platform. This dual-channel weigh scale module enables the processor to read and process weight data directly from two independent scales without requiring external signal conditioners or transmitters. We supply this unit as 100% Brand New original factory stock, providing a seamless, backplane-integrated solution for batching, silo level monitoring, and material handling applications.
Technical Specifications
| Feature | Specification |
| Manufacturer | Allen-Bradley / Rockwell Automation |
| Product Line | ControlLogix (1756 Series) |
| Module Type | Dual-Channel Weigh Scale Module |
| Input Signal Range | -0.3 to 15.3 Millivolts (mV) |
| Excitation Output | 5V DC to 8.75V DC |
| Calibration Methods | C2 Electronic Calibration / Manual Calibration |
| Hot-Swappable | Yes (RIUP Supported) |
| Operating Temperature | 32° to 140°F (0° to 60°C) |
| Backplane Interface | Standard 1756 Chassis Slot |
| Weight | 2.00 lbs (0.91 kg) |
Engineering Advantages
-
C2 Electronic Calibration: The 1756-2WS supports C2 electronic calibration, which allows the system to calibrate the scale without using heavy test weights. This feature significantly reduces maintenance time and eliminates the safety risks associated with manual weight handling in large-capacity silos.
-
Direct Backplane Integration: By plugging directly into a ControlLogix chassis, the module eliminates the latency and noise interference inherent in serial or 4-20mA analog weight transmitters. The PLC accesses raw weight data at backplane speeds, ensuring immediate response for high-speed filling or batching lines.
-
Removal and Insertion Under Power (RIUP): The 1756-2WS supports hot-swapping. Maintenance teams can replace a module while the rest of the chassis remains energized, minimizing downtime in continuous process environments.
-
Precision Signal Processing: The module detects minute changes in the millivolt range (-0.3 to 15.3 mV), providing the sensitivity required for high-accuracy industrial scales. It filters out electrical noise to ensure stable weight readings despite the presence of heavy machinery or VFDs.
-
Dual-Channel Independence: Two separate channels allow for the simultaneous monitoring of two different vessels or scales. This density reduces the number of slots required in the chassis, lowering the overall hardware footprint and system cost.
FAQs
-
Can the 1756-2WS be used in a CompactLogix system?
While the 1756 series primarily targets ControlLogix chassis, certain communication adapters allow the module to operate in distributed architectures; however, it natively fits the 1756 local or remote I/O chassis.
-
Does the module require a separate power supply for the load cells?
No. The 1756-2WS provides an excitation voltage output between 5V and 8.75V DC to power the connected load cells directly through the terminal block.
-
What type of load cells are compatible?
The module interfaces with standard 4-wire or 6-wire strain-gauge-type load cells. For long cable runs, we recommend 6-wire configurations to allow the module to compensate for voltage drops in the cabling.
-
Is this a genuine, factory-sealed unit?
Yes. We guarantee this 1756-2WS is 100% Brand New. It ships in its original Allen-Bradley factory packaging with intact security seals, ensuring the highest reliability for critical weighing processes.
Additional Information
- 100% Genuine Parts: All products are original and authentic, ensuring reliable industrial performance.
- 30-Day Refund Guarantee: Return any in-stock item within 30 days in original, unopened packaging for a full refund (excluding shipping and fees).
- 12-Month Warranty: Covers defects in materials or workmanship; excludes misuse, normal wear, or unauthorized modifications.
- Worldwide Shipping: We ship via USPS, UPS, FedEx, and DHL. Delivery times vary by country and may be subject to customs or import fees.
- Support & Contact: Technical and warranty assistance is available anytime. Contact us here: Contact.
- Purchase Guidance: Check product specifications and compatibility carefully before ordering to ensure proper application.
Tech & Buying Guide
Preventing Spurious Trips in Emergency Stop Systems: A Technical Guide
In industrial automation, the Emergency Stop (E-Stop) pushbutton is the ultimate safety line. However, relying on a single Normally-Closed (NC) contact can sometimes lead to unexpected spurious trips. As a control systems engineer, I have seen these nuisance trips halt entire production lines, causing significant downtime. Understanding why these components fail and how to implement robust architecture is essential for any reliable DCS or PLC-based safety system.
Sequencing Induction Motor Control with PLC Logic: Best Practices
In modern industrial automation, controlling a group of induction motors requires precision and safety. Uncontrolled simultaneous startup of multiple large motors often causes significant voltage dips, potentially triggering protective trips. Therefore, implementing a sequential startup and shutdown strategy is essential. This approach minimizes inrush current and ensures the system operates within established power constraints. A robust PLC program serves as the ideal engine for orchestrating these sequences.
Mastering PLC Programming: Best Practices for Robust Industrial Automation
Writing clean PLC code requires discipline, especially regarding memory management. Avoid overusing SET and RESET instructions, as they often complicate debugging. If multiple rungs control the same bit, troubleshooting becomes a nightmare. Instead, focus on energizing a bit in only one location. If your logic requires complex conditions, use branches within a single rung. This approach keeps your code readable, maintainable, and significantly easier to audit during downtime.