Allen-Bradley 1769-WS CompactLogix Weigh Scale Module
The Allen-Bradley 1769-WS, also cataloged as the HI 1769-WS Weigh Scale Module, operates as a dedicated hardware component for strain gauge load cell digitizing and weight signal processing within Allen-Bradley CompactLogix platforms.
Suffix Breakdown & Model Matrix
- 1769: Compact I/O hardware platform architecture for CompactLogix and MicroLogix 1500 systems.
- WS: Single-channel weigh scale module classification developed by Hardy Process Solutions.
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | 1769-WS |
| Brand | Allen-Bradley / Hardy Process Solutions |
| Origin | USA |
| Weight | 0.26 kg (0.56 lbs) |
| Dimensions | Standard 1769 Compact I/O single-slot width |
| Operating Temp | 0 to 60 deg C |
| Power Consumption | Max 0.5 A at 5 VDC (backplane bus current) |
| Load Cell Excitation | 5 VDC (drives up to four 350-ohm load cells) |
| Signal Input Range | -0.3 mV to +15.3 mV |
| Internal Resolution | 1:8,388,608 (23-bit) |
| Update Rate | 100 conversions per second |
| Common Mode Rejection | 100 dB minimum at or below 60 Hz |
Backplane Bus Communication and Deterministic I/O
The Allen-Bradley 1769-WS module utilizes high-speed backplane bus communication velocity to transmit processed gross, net, and rate-of-change weight data directly to CompactLogix controllers. Operating within EtherNet/IP deterministic networks, the hardware incorporates WAVERSAVER mechanical vibration rejection software filtering to stabilize weight readings above 0.25 Hz. Firmware flash compatibility and dynamic I/O density scaling allow integrated C2 electronic calibration without requiring physical test weights across continuous batching processes.
Frequently Asked Questions
Q: How many load cells can be powered directly from a single 1769-WS weigh scale module?
A: The module supplies a regulated 5 VDC excitation voltage capable of driving up to four 350-ohm load cells or sensors connected in parallel.
Q: What calibration methods does the 1769-WS module support within the controller software?
A: The unit supports both traditional calibration using certified test weights and Hardy C2 electronic calibration, which reads internal calibration data stored inside C2-certified load cells.
Field Installation Guidelines
- Disconnect system backplane power before inserting or removing the 1769-WS module from the CompactLogix sub-rack rail.
- Route strain gauge load cell signal cables in dedicated low-voltage instrument conduits separated from AC power conductors and motor drives.
- Ground cable shield braids at the designated system enclosure earth bus bar to maximize noise rejection performance.
- Verify that total load cell bridge resistance remains above the minimum allowable impedance threshold before applying 5 VDC excitation.
- Tighten terminal block retaining screws and module DIN rail latches to maintain reliable backplane bus connector alignment.
Allen-Bradley 1769-WS CompactLogix Weigh Scale Module
Allen-Bradley 1769-WS CompactLogix Weigh Scale Module
The Allen-Bradley 1769-WS, also cataloged as the HI 1769-WS Weigh Scale Module, operates as a dedicated hardware component for strain gauge load cell digitizing and weight signal processing within Allen-Bradley CompactLogix platforms.
Suffix Breakdown & Model Matrix
- 1769: Compact I/O hardware platform architecture for CompactLogix and MicroLogix 1500 systems.
- WS: Single-channel weigh scale module classification developed by Hardy Process Solutions.
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | 1769-WS |
| Brand | Allen-Bradley / Hardy Process Solutions |
| Origin | USA |
| Weight | 0.26 kg (0.56 lbs) |
| Dimensions | Standard 1769 Compact I/O single-slot width |
| Operating Temp | 0 to 60 deg C |
| Power Consumption | Max 0.5 A at 5 VDC (backplane bus current) |
| Load Cell Excitation | 5 VDC (drives up to four 350-ohm load cells) |
| Signal Input Range | -0.3 mV to +15.3 mV |
| Internal Resolution | 1:8,388,608 (23-bit) |
| Update Rate | 100 conversions per second |
| Common Mode Rejection | 100 dB minimum at or below 60 Hz |
Backplane Bus Communication and Deterministic I/O
The Allen-Bradley 1769-WS module utilizes high-speed backplane bus communication velocity to transmit processed gross, net, and rate-of-change weight data directly to CompactLogix controllers. Operating within EtherNet/IP deterministic networks, the hardware incorporates WAVERSAVER mechanical vibration rejection software filtering to stabilize weight readings above 0.25 Hz. Firmware flash compatibility and dynamic I/O density scaling allow integrated C2 electronic calibration without requiring physical test weights across continuous batching processes.
Frequently Asked Questions
Q: How many load cells can be powered directly from a single 1769-WS weigh scale module?
A: The module supplies a regulated 5 VDC excitation voltage capable of driving up to four 350-ohm load cells or sensors connected in parallel.
Q: What calibration methods does the 1769-WS module support within the controller software?
A: The unit supports both traditional calibration using certified test weights and Hardy C2 electronic calibration, which reads internal calibration data stored inside C2-certified load cells.
Field Installation Guidelines
- Disconnect system backplane power before inserting or removing the 1769-WS module from the CompactLogix sub-rack rail.
- Route strain gauge load cell signal cables in dedicated low-voltage instrument conduits separated from AC power conductors and motor drives.
- Ground cable shield braids at the designated system enclosure earth bus bar to maximize noise rejection performance.
- Verify that total load cell bridge resistance remains above the minimum allowable impedance threshold before applying 5 VDC excitation.
- Tighten terminal block retaining screws and module DIN rail latches to maintain reliable backplane bus connector alignment.
