Overview
Weighing Function and Signal Processing
The 1769-2WS accepts low-level input signals from -0.3 mV to +15.3 mV. It provides 5 VDC excitation for connected weighing sensors and supports up to eight load cells across its two input channels.
The module converts sensor signals into digital weight measurements. Its internal resolution of 1:8,388,608 provides fine measurement granularity. Meanwhile, the 100 updates-per-second rate defines how frequently the module updates its measurement data.
Power and Controller Integration
The module receives its operating power from the controller system backplane through the +5 VDC supply. Therefore, the installed system must provide sufficient backplane current for the module, with the specified consumption below 0.5 A.
Its stated controller compatibility includes CompactLogix and MicroLogix 1500 platforms. Check the controller configuration and installation requirements before selecting the module for an existing system.
Load Cell Capacity and Excitation
The two channels allow the module to process signals from two separate weighing scales. In addition, the 5 VDC excitation output supports up to eight 350-ohm load cells across the two scales. An external power supply is required when the connected load cell arrangement exceeds the supported excitation capacity.
The module also communicates weight and diagnostic data through the controller backplane. This arrangement allows the PLC to receive weighing information without requiring a separate standalone weighing instrument.
Technical Specifications
| Parameter | Specification |
|---|---|
| Model | 1769-2WS |
| Brand | Hardy Process Solutions |
| Controller Platform | Allen-Bradley CompactLogix, MicroLogix 1500 |
| Module Type | Dual-Channel Weigh Scale Module |
| Number of Channels | 2 |
| Input Signal Range | -0.3 mV to +15.3 mV |
| Sensor Sense Voltage | +5 VDC |
| Excitation Output | +5 VDC |
| Maximum Load Cell Capacity | 8 load cells |
| Supported Load Cell Rating | 350 ohms |
| Internal Resolution | 1:8,388,608 |
| Conversion Rate | 100 updates per second |
| Module Update Rate | 100 updates per second |
| Backplane Power | +5 VDC |
| Backplane Current | Less than 0.5 A at 5 VDC |
| Operating Temperature | 0 to 60 deg C (32 to 140 deg F) |
Frequently Asked Questions
Q: How many load cells can the 1769-2WS support?
A: The module supports up to eight 350-ohm load cells across two weighing scales. An external power supply is needed to support additional load cells.
Q: Which PLC platforms are compatible with the 1769-2WS?
A: The module is designed for Allen-Bradley CompactLogix and MicroLogix 1500 controllers. It communicates with the PLC processor through the I/O chassis backplane.
Q: What is the signal update rate of the 1769-2WS?
A: The module provides a conversion rate of 100 updates per second, allowing it to refresh weighing data up to 100 times per second.
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