Allen-Bradley 1756-WS ControlLogix Weigh Scale Module
The Allen-Bradley 1756-WS is a single-channel weigh scale module designed for the ControlLogix PAC platform. It interfaces directly with strain-gauge load cells to deliver precise weight measurements for industrial batching, tank weighing, and process automation. Featuring a high-speed conversion rate of 50 updates per second and an exceptionally low non-linearity of 0.0015% of full scale, the 1756-WS delivers rapid, highly accurate data processing without relying on third-party transmitter hardware.
Load Cell Interface & Data Processing
The module provides a regulated 5 VDC excitation output to drive load cell configurations (supporting up to four 350-Ohm load cells) with a maximum power draw of 1.15 W. Integrated digital voltmeter functionality offers a resolution accuracy of ±2% of full scale, facilitating diagnostic monitoring directly within the chassis.
Electrical & Environmental Specs
Powered via the ControlLogix chassis backplane, the unit draws dual-voltage supply at 5 VDC and 24 VDC. Operating at high efficiency, backplane current demand remains under 1 A at 5 VDC, while backplane power consumption is kept under 5 W at 5 VDC and under 0.3 W at 24 VDC under standard 4-cell loading conditions. The module is rated for industrial environments ranging from 0 to 60 deg C and up to 90% non-condensing relative humidity.
Parameter Table
| Parameter | Specification |
|---|---|
| Brand | Allen-Bradley |
| Model | 1756-WS |
| Product Type | Weigh Scale Modules |
| Series | ControlLogix |
| Number of Channels | Single Channel |
| Conversion Rate | 50 updates per second |
| Non-Linearity | 0.0015% of Full Scale |
| Common-Mode Voltage | 2.5 VDC max |
| Load Cell Output | 5 VDC (±1.15 W max) |
| Digital Voltmeter Accuracy | ±2% of Full Scale Resolution |
| Backplane Input Voltage | 5 VDC / 24 VDC |
| Backplane Current Load | < 1 A at 5 VDC |
| Backplane Power Load | < 5 W at 5 VDC, < 0.3 W at 24 VDC (with 4x 350 Ohm Load Cells) |
| Operating Temperature | 0 to 60 deg C |
| Storage Temperature | -40 to 85 deg C |
| Operating Humidity | 0 to 90% (non-condensing) |
| Approvals | CE |
| Weight | 1.06 lbs (0.48 kg) |
Frequently Asked Questions
Q: How many load cells can be connected to the 1756-WS module? A: The single-channel module supports up to four 350-Ohm strain-gauge load cells utilizing its internal 5 VDC excitation supply.
Q: What update rate does the 1756-WS provide for weight measurements? A: It converts and updates weight data at a rate of 50 updates per second with a non-linearity rating of 0.0015% of full scale.
Allen-Bradley 1756-WS ControlLogix Weigh Scale Module
Allen-Bradley 1756-WS ControlLogix Weigh Scale Module
The Allen-Bradley 1756-WS is a single-channel weigh scale module designed for the ControlLogix PAC platform. It interfaces directly with strain-gauge load cells to deliver precise weight measurements for industrial batching, tank weighing, and process automation. Featuring a high-speed conversion rate of 50 updates per second and an exceptionally low non-linearity of 0.0015% of full scale, the 1756-WS delivers rapid, highly accurate data processing without relying on third-party transmitter hardware.
Load Cell Interface & Data Processing
The module provides a regulated 5 VDC excitation output to drive load cell configurations (supporting up to four 350-Ohm load cells) with a maximum power draw of 1.15 W. Integrated digital voltmeter functionality offers a resolution accuracy of ±2% of full scale, facilitating diagnostic monitoring directly within the chassis.
Electrical & Environmental Specs
Powered via the ControlLogix chassis backplane, the unit draws dual-voltage supply at 5 VDC and 24 VDC. Operating at high efficiency, backplane current demand remains under 1 A at 5 VDC, while backplane power consumption is kept under 5 W at 5 VDC and under 0.3 W at 24 VDC under standard 4-cell loading conditions. The module is rated for industrial environments ranging from 0 to 60 deg C and up to 90% non-condensing relative humidity.
Parameter Table
| Parameter | Specification |
|---|---|
| Brand | Allen-Bradley |
| Model | 1756-WS |
| Product Type | Weigh Scale Modules |
| Series | ControlLogix |
| Number of Channels | Single Channel |
| Conversion Rate | 50 updates per second |
| Non-Linearity | 0.0015% of Full Scale |
| Common-Mode Voltage | 2.5 VDC max |
| Load Cell Output | 5 VDC (±1.15 W max) |
| Digital Voltmeter Accuracy | ±2% of Full Scale Resolution |
| Backplane Input Voltage | 5 VDC / 24 VDC |
| Backplane Current Load | < 1 A at 5 VDC |
| Backplane Power Load | < 5 W at 5 VDC, < 0.3 W at 24 VDC (with 4x 350 Ohm Load Cells) |
| Operating Temperature | 0 to 60 deg C |
| Storage Temperature | -40 to 85 deg C |
| Operating Humidity | 0 to 90% (non-condensing) |
| Approvals | CE |
| Weight | 1.06 lbs (0.48 kg) |
Frequently Asked Questions
Q: How many load cells can be connected to the 1756-WS module? A: The single-channel module supports up to four 350-Ohm strain-gauge load cells utilizing its internal 5 VDC excitation supply.
Q: What update rate does the 1756-WS provide for weight measurements? A: It converts and updates weight data at a rate of 50 updates per second with a non-linearity rating of 0.0015% of full scale.
