The Allen-Bradley 1746-WS is a specialized weigh scale module engineered for integration within the SLC 500 programmable controller system. This module functions as a dedicated interface, connecting industrial load cells directly to the PLC architecture. By bypassing the requirement for external signal transmitters or conditioning hardware, the 1746-WS simplifies system design for precision weighing tasks, including hopper, tank, vessel, and platform scale monitoring.
Features
Supports up to eight full Wheatstone bridge, strain gauge load sensors per module.
Provides a stable 5V DC excitation voltage for connected sensors.
Delivers a throughput of 20 updates per second for responsive data acquisition.
Features two integrated digital TTL-level outputs for control applications.
High noise immunity with a common-mode rejection ratio of 110 dB at 60 Hz.
Supports both local and remote operating modes for flexible configuration.
Technical Specifications
Brand
Allen-Bradley
Product Series
SLC 500
Module Type
Weigh Scale Module
Channels
2
Backplane Current Draw
0.25 Amps @ 5V DC
Load Cell Excitation
5V DC
Load Cell Rating
350 Ohms
Accuracy
+/- 2% (Digital Voltmeter)
Conversion Rate
20 updates/sec
Common-Mode Rejection
110 dB (at or below 60 Hz)
Output Type
2x TTL Digital Outputs
Installation Guidelines
Ensure the SLC 500 rack power is disconnected before installing or removing the 1746-WS module.
Use shielded, twisted-pair cabling for load cell connections to minimize electromagnetic interference (EMI).
Properly ground the cable shields at the module end to maintain signal integrity.
Avoid routing load cell signal wires alongside high-voltage AC power lines or heavy inductive loads.
Verify that the total resistance of the load cell array is compatible with the 350 Ohm rating.
Maintain adequate clearance around the module within the chassis to ensure proper convective cooling.
FAQ
How many load cells can this module handle? The 1746-WS is designed to support up to eight full Wheatstone bridge load cells connected in parallel.
Is this module compatible with all SLC 500 racks? The 1746-WS is designed for the standard SLC 500 I/O chassis; please ensure your specific processor and power supply configuration supports the 250 mA backplane current draw of this module.
Does this module require external signal conditioning? No, the 1746-WS acts as a direct interface to the load cells, providing the necessary excitation and signal processing internally.
