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Description
The Allen-Bradley 1746-WS is a high-precision weigh scale module designed for the SLC 500 controller platform. It serves as a direct interface between the PLC and industrial load cells, eliminating the need for external weight transmitters. This module is ideal for industrial weighing applications such as tank/vessel weighing, hopper scales, and platform scales where high accuracy and reliability are required.
Features
- Supports up to eight (8) full Wheatstone bridge, strain gauge load sensors on a single vessel.
- Provides a stable 5V DC excitation voltage to the load cells.
- Processes millivolt signals into accurate weight data for the SLC processor.
- Conversion rate of 20 updates per second for responsive weight monitoring.
- Includes two standard digital TTL level outputs for process control.
- Integrated common-mode rejection of 110 dB (at or below 60 Hz).
Applications
- Tank and vessel level monitoring.
- Hopper and silo weighing systems.
- Industrial platform scales.
- Batching and blending process control.
Technical Specifications
| Brand |
Allen-Bradley |
| Product Line |
SLC 500 |
| Module Type |
Weigh Scale Module |
| Number of Channels |
2 |
| Backplane Current Draw |
0.25 Amps (250 mA) @ 5V DC |
| Load Cell Excitation |
5V DC |
| Load Cell Rating |
350 Ohms |
| Accuracy |
+/- 2% |
| Common-Mode Rejection |
110 dB (at or below 60 Hz) |
| Conversion Rate |
20 updates per second |
| Output Type |
2 x TTL level digital outputs |
Installation Guidelines
- Ensure the SLC 500 rack power is disconnected before installing or removing the module.
- Mount the module in a standard SLC 500 I/O chassis slot.
- Use shielded twisted-pair cabling for load cell connections to minimize EMI interference.
- Maintain proper grounding practices for the chassis to ensure signal integrity.
- Verify that the load cell impedance matches the 350 Ohm specification for optimal performance.
- Ensure adequate ventilation within the enclosure to maintain operating temperature limits.
FAQ
What is the primary function of the 1746-WS module?
The 1746-WS is designed to interface directly with strain gauge load cells, converting raw millivolt signals into digital weight data for processing by an Allen-Bradley SLC 500 controller.
How many load cells can this module support?
The module is capable of supporting up to eight (8) full Wheatstone bridge, 350 Ohm load sensors on a single vessel.
Does this module require external transmitters?
No, the 1746-WS acts as a direct interface, which eliminates the need for additional external weight transmitters in the signal path.
