Industrial Weighing Solution – HARDY 1746-WS | SLC 500 Weigh Scale Module
The HARDY 1746-WS is a dedicated weigh scale I/O module designed for Allen-Bradley SLC 500 rack systems. It provides direct load cell signal conditioning, real-time weight data acquisition, and seamless integration with SLC 500 ladder logic — eliminating the need for external weight transmitters in precision weighing applications.
Where This Product Is Used
The 1746-WS is specified by process engineers and system integrators across industries where accurate, repeatable weight measurement is critical:
- Batching & Blending Plants — Gravimetric ingredient dosing in food, chemical, and pharmaceutical manufacturing
- Filling & Packaging Lines — Net-weight filling control for bags, drums, and containers
- Hopper & Silo Weighing — Continuous inventory monitoring of bulk solids and liquids
- Conveyor Belt Scales — Dynamic in-motion weighing for material flow measurement
- Tank & Vessel Weighing — Level-by-weight measurement in process vessels
- Check Weighing Systems — Quality control verification on production lines
- Truck & Rail Scales — Vehicle weighing integrated with SLC 500 plant control systems
Technical Specifications
- Model: 1746-WS
- Brand: HARDY
- Compatible Platform: Allen-Bradley SLC 500 (1746 I/O chassis)
- Load Cell Inputs: Up to 8 load cells (350 Ω) in parallel
- Excitation Voltage: 10 VDC regulated
- Input Range: ±15 mV (full-scale load cell signal)
- Resolution: 16-bit A/D conversion
- Update Rate: Configurable; up to 60 updates/second
- Communication: SLC 500 backplane (1746 rack)
- Calibration: C2® electronic calibration (no test weights required)
- Tare Function: Software tare via ladder logic
- Weight Units: Configurable (lb, kg, g, oz, t)
- Operating Temperature: 0°C to 60°C (32°F to 140°F)
- Storage Temperature: -40°C to 85°C
- Power Consumption: 800 mA @ 5 VDC (from SLC backplane)
- Weight: 1,240 g
- Certifications: UL Listed, CE Marked
Why Engineers Specify This Model
- Native SLC 500 Integration — Occupies a standard 1746 slot; weight data appears directly in the SLC data table with no gateway or converter required
- C2® Electronic Calibration — Calibrate using known load cell mV/V values without hanging test weights — critical for fixed installations and hazardous areas
- WAVERSAVER® Vibration Rejection — Proprietary digital filtering eliminates vibration-induced weight errors common in industrial environments
- Integrated Rate-of-Change — Built-in flow rate calculation for loss-in-weight feeders and filling applications
- Diagnostic Feedback — Module self-diagnostics report load cell faults, A/D errors, and calibration status directly to the SLC processor
- Proven Reliability — HARDY (now part of Mettler Toledo) modules are the industry benchmark for SLC 500 weighing; widely supported by system integrators worldwide
Complete System Bill of Materials
A typical SLC 500 weigh scale system using the 1746-WS includes:
- 1746-WS — Weigh Scale Module (this item)
- SLC 500 processor (e.g., 1747-L532, 1747-L543)
- 1746 chassis (4, 7, 10, or 13 slot)
- 1746-P4 or compatible power supply
- Hardy load cells (e.g., HI 4050 series) or equivalent 350 Ω load cells
- Junction box / summing card for multi-load-cell installations
- Shielded load cell cable (4- or 6-wire)
- HI 6500 series weight controller (optional, for standalone display)
Compliance & Industry Standards
- UL 508 — Industrial Control Equipment
- CE Marking — EMC Directive 2014/30/EU & Low Voltage Directive 2014/35/EU
- OIML R 76 / NTEP compatible load cell interface
- RoHS Compliant
- Designed for use in Pollution Degree 2 environments per IEC 61010-1
Quality Assurance & Sourcing
Konmask.com sources the HARDY 1746-WS through verified industrial automation supply channels. Every unit undergoes:
- Visual and mechanical inspection upon receipt
- Authenticity verification against manufacturer documentation
- Functional power-on check prior to dispatch
- Anti-static packaging with humidity indicator card
- Traceable lot documentation available on request
We supply both new surplus and factory-refurbished units. Condition is clearly stated on each listing. All units carry a 12-month warranty against defects in materials and workmanship.
How to Source This Part
- In Stock: Ships within 1–3 business days from Hong Kong
- Lead Time (new factory order): 8–14 weeks (contact us for current availability)
- Minimum Order: 1 unit
- Volume Pricing: Available for orders of 5+ units — contact [email protected]
- Export: We ship worldwide; DDP/DAP Incoterms available for most destinations
- Documentation: Commercial invoice, packing list, and certificate of origin provided
Application-Specific FAQ
Q: Can the 1746-WS be used in a ControlLogix or CompactLogix system?
A: No. The 1746-WS is designed exclusively for the SLC 500 (1746) backplane. For Logix platforms, consider the HARDY HI 6500 series with EtherNet/IP connectivity.
Q: How many load cells can be connected to a single 1746-WS?
A: Up to 8 load cells rated at 350 Ω each can be wired in parallel to the module’s excitation and signal inputs.
Q: Is test-weight calibration required on installation?
A: Not if your load cells support C2® electronic calibration. The module can be calibrated using the load cell’s mV/V certificate value, which is especially useful for fixed or elevated installations.
Q: What is WAVERSAVER® and when is it needed?
A: WAVERSAVER® is HARDY’s proprietary vibration-rejection algorithm. It is essential in applications near conveyors, mixers, or other vibrating machinery where mechanical noise would otherwise corrupt weight readings.
Q: Can I use third-party load cells with the 1746-WS?
A: Yes. Any 350 Ω load cell with a standard mV/V output is compatible. C2® electronic calibration requires HARDY C2® certified load cells; otherwise, traditional deadweight calibration applies.
Q: Is the 1746-WS still in production?
A: The 1746-WS has reached end-of-life from the manufacturer. Konmask.com maintains stock of new surplus and refurbished units to support ongoing SLC 500 installations and legacy system maintenance.
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