Allen-Bradley 1769-WS Weigh Scale Module

Overview

The Allen-Bradley 1769-WS is a high-performance weigh scale module designed by Hardy Process Solutions for use with Allen-Bradley MicroLogix 1500 and CompactLogix programmable controllers. This single-channel module offers precise weighing and advanced features for industrial automation applications. It is engineered to deliver accurate weight measurements while minimizing disturbances from vibrations and external noise.

Key Features

Manufacturer: Allen Bradley
Product Type: Weigh Scale Module
Product Line: CompactLogix
Part Number: 1769-WS
Power Supply: Powered via the backplane at +5V DC
Current Draw: < 0.5 Amps at 5V DC
Excitation Voltage: 5V DC for connected load cells

Environmental Conditions

Operating Temperature: 0 to 60°C (32 to 140°F)
Storage Temperature: -40 to 65°C (-40 to 185°F)
Humidity: 5 to 95%, non-condensing

Technical Specifications

Parameter	Specification
Weighing Modes	Net, Gross, Rate-of-change
Resolution	1:8,388,608 Internal
Conversion Rate	100 updates per second
Calibration	Electronic (C2), Traditional (Test weights)
Vibration Frequency Rejection	0.25 Hz and above, 5 selectable steps
Common Mode Rejection	100 dB at or below 60 Hz
Indicators	Bi-color LEDs: “OK” (Module Status), “Scale 1” & “Scale 2” (Functional Data)
Standards Compliance	UL/CUL, CE, Class I, Div 2, Group A, B, C, D

Performance and Features

The 1769-WS weigh scale module features WAVERSAVER technology to eliminate disruptive vibrations, ensuring stable and accurate readings even in challenging industrial environments. The module processes and digitizes weight signals at a rate of 110 times per second, providing over 8 million resolution counts for precision. It supports up to four 350-ohm load cells connected to a single scale.

Additionally, the Integrated Technician (IT) feature, in conjunction with an IT Junction Box, allows real-time diagnostics, aiding troubleshooting and system maintenance.