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Product Description
The Allen-Bradley 1769-2WS is a high-precision, dual-channel weigh scale interface module engineered for seamless integration with Allen-Bradley CompactLogix and MicroLogix 1500 programmable logic controllers (PLCs). Designed for demanding industrial weighing environments, it delivers reliable signal conditioning and accurate weight data acquisition from multiple load cells.

This module supports up to eight 350-ohm strain gauge–based load cells—four per channel—enabling flexible multi-sensor configurations. Each channel features independent excitation and signal processing, ensuring minimal crosstalk and enhanced measurement integrity.

Key technical attributes include:

  • Excitation Voltage: 5 VDC ±1% (regulated), capable of driving up to four 350-ohm load cells per channel

  • Isolation: 1500 VDC channel-to-channel and channel-to-backplane isolation for noise immunity and operator safety

  • Measurement Resolution: Up to 1 part in 10,000 (10,000:1) per channel

  • Update Rate: Adjustable from 10 to 250 samples per second per channel

  • Output Interface: Communicates via the 1769 Compact I/O backplane; no discrete outputs—data is transmitted digitally to the PLC processor

  • Operating Temperature: –40°C to +70°C (–40°F to +158°F)

  • Power Consumption: 2.0 A max at 5.1 VDC from backplane (typical under full load)

  • Mounting: DIN-rail compatible, standard 1769 form factor

Note: The original description incorrectly states "24VDC operation" and "solid-state relay outputs." The 1769-2WS is a low-voltage analog input module powered via the CompactLogix backplane (5.1 VDC) and does not feature relay or discrete outputs.

Typical Applications

  • Batch weighing systems

  • Hopper and tank level monitoring

  • Conveyor belt checkweighers

  • Force and tension measurement in manufacturing lines

 


FAQ
Q: Can the 1769-2WS be used with ControlLogix systems?
A: No. It is designed exclusively for the 1769 Compact I/O platform used with CompactLogix and MicroLogix 1500 controllers. ControlLogix requires the 1756-WS series modules.

 

Q: Does each channel require separate calibration?
A: Yes. Each channel operates independently and must be calibrated individually in the PLC logic using scale engineering units and tare functions.

Q: What communication protocol does it use?
A: It uses implicit CIP messaging over the 1769 backplane—no Ethernet or serial configuration is needed.

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