HARDY 1756-2WS – 2-Channel Weigh Scale Module | ControlLogix Platform
Engineering Background
The HARDY 1756-2WS is a high-precision, dual-channel weigh scale module engineered for seamless integration into the Allen-Bradley ControlLogix backplane. Designed by Hardy Process Solutions — a recognized leader in industrial weighing technology — this module brings certified accuracy and advanced diagnostics directly into the Logix control architecture, eliminating the need for standalone weight controllers and reducing panel footprint.
Product Positioning
Targeted at process engineers and OEM system integrators who demand sub-0.1% accuracy in batching, blending, filling, and checkweighing applications, the 1756-2WS delivers real-time weight data natively within Studio 5000 / RSLogix 5000, enabling tight closed-loop control without external serial or analog conversion.
Complete Technical Specifications
| Parameter | Specification |
|---|---|
| Model Number | 1756-2WS |
| Manufacturer | HARDY Process Solutions (Hardy Instruments) |
| Platform | Allen-Bradley ControlLogix (1756 Series) |
| Channels | 2 independent weigh scale channels |
| Load Cell Excitation | 10 VDC, up to 8 × 350 Ω load cells per channel |
| A/D Resolution | 24-bit sigma-delta |
| Accuracy | ±0.01% of full scale |
| Update Rate | Up to 60 Hz per channel |
| Calibration Method | C2® Electronic Calibration (no test weights required) |
| Vibration Filtering | WAVERSAVER® (patented) |
| Communication | ControlLogix backplane (native); Hardy-Link™ peer-to-peer |
| Input Connector | 6-pin removable terminal block per channel |
| Power Consumption | 3.5 W (from backplane) |
| Operating Temperature | 0 °C to +60 °C |
| Storage Temperature | -40 °C to +85 °C |
| Humidity | 5–95% RH, non-condensing |
| Enclosure Rating | IP20 (panel-mount, backplane-seated) |
| Certifications | UL, CE, ATEX (consult datasheet for zone ratings) |
| Weight | 1.24 kg |
| Slot Width | 1 slot (1756 chassis) |
Proven Application Environments
- Batch Weighing & Blending – Pharmaceutical, food & beverage, and chemical plants requiring recipe-driven multi-ingredient batching with audit trails.
- Continuous Loss-in-Weight Feeding – Plastics extrusion and compounding lines where gravimetric feed rate accuracy is critical.
- Tank / Silo Level by Weight – Bulk storage monitoring in grain, cement, and petrochemical facilities.
- Checkweighing & Filling Lines – High-speed packaging lines requiring real-time over/under rejection.
- Truck / Rail Scale Integration – Pit-mounted or above-ground platform scales tied to ERP/MES via ControlLogix.
Engineering Advantages
- C2® Electronic Calibration – Calibrate with stored load cell mV/V data; no physical test weights needed, reducing downtime during commissioning and recalibration.
- WAVERSAVER® Vibration Rejection – Patented algorithm isolates true weight signal from mechanical vibration (conveyors, mixers, pumps), enabling accurate readings in harsh plant environments.
- Native Backplane Integration – Weight data appears as standard Logix tags; no gateway, no serial bridge, no additional programming overhead.
- Hardy-Link™ Peer-to-Peer – Synchronize multiple 1756-2WS modules for multi-point weighing or redundant scale configurations without PLC scan-time overhead.
- Dual-Channel Density – Two independent scale channels in a single 1756 slot reduces chassis space and wiring cost versus discrete single-channel solutions.
- Integrated Diagnostics – Real-time load cell health monitoring (excitation voltage, mV/V range check) surfaces faults directly in Studio 5000 for predictive maintenance.
System Architecture & Signal Flow
Load cells (up to 8 × 350 Ω per channel) connect via the 6-pin removable terminal block. The 1756-2WS supplies 10 VDC excitation, conditions the millivolt bridge signal through a 24-bit sigma-delta ADC, applies WAVERSAVER® filtering, and presents calibrated weight values as floating-point Logix tags on the ControlLogix backplane. The host PLC reads weight data at the configured RPI (Requested Packet Interval), enabling deterministic closed-loop control within the Logix scan cycle. Hardy-Link™ allows direct module-to-module communication for synchronized multi-scale applications.
Sourcing & Quality Verification
- All units sourced from authorized distributors or verified surplus channels with documented chain of custody.
- Pre-shipment inspection: visual, label verification, and functional power-on check where applicable.
- Firmware version and hardware revision documented on request.
- Original HARDY packaging and documentation supplied where available.
- Counterfeit-prevention: serial number cross-referenced against manufacturer records on request.
Procurement Process
- Submit RFQ via support@konmask.com or add to cart for immediate checkout.
- Receive order confirmation and lead-time estimate within 1 business day.
- Unit inspected, packed, and dispatched with tracking; DHL / FedEx / UPS international express available.
- Post-delivery technical support provided by Konmask engineering team.
Technical FAQ
Q: Is the 1756-2WS compatible with all ControlLogix chassis?
A: Yes — it seats in any 1756 chassis (4, 7, 10, 13, 17-slot) and is supported by RSLogix 5000 / Studio 5000 v16 and later.
Q: Can I use the 1756-2WS with GuardLogix?
A: The module is not SIL-rated; it can coexist in a GuardLogix chassis but weight data is treated as standard (non-safety) I/O.
Q: What load cell types are supported?
A: Any strain-gauge load cell with 350 Ω impedance and mV/V output. C2® cells provide electronic calibration data; standard analog cells are also supported with traditional deadweight calibration.
Q: Is ATEX certification available?
A: Consult the official HARDY 1756-2WS datasheet or contact Konmask for zone-specific certification documentation.
Q: What is the typical lead time?
A: In-stock units ship within 1–3 business days. Contact us for volume orders or expedited requirements.
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