The Allen-Bradley 1771-WS is a specialized Weigh Scale Module designed for the PLC-5 programmable controller platform. This single-channel module is engineered to interface directly with strain-gauge load cells, providing precise weight measurement and signal conditioning for industrial weighing applications. It is a legacy component, often utilized in single-vessel weighing systems where high-accuracy data acquisition is required within a PLC-5 environment.
Features
Single-channel input for strain-gauge load cell connectivity.
Designed specifically for integration with the Allen-Bradley PLC-5 I/O chassis.
Supports 0 to 30 mV input signal ranges.
Integrated signal processing for weight measurement applications.
Standard 5 VDC backplane power requirement.
Applications
This module is typically used in industrial automation environments requiring weight monitoring, such as batching systems, vessel weighing, inventory management, and force measurement tasks where PLC-5 control systems are currently deployed.
Technical Specifications
Product Model
1771-WS
Module Type
Weigh Scale Module
Compatibility
PLC-5 Systems
Channels
1
Input Range
0 to 30 mV
Backplane Current
1.5 A at 5 VDC
Weight
0.74 kg
Installation Guidelines
Ensure the PLC-5 chassis power is disconnected before installing or removing the 1771-WS module to prevent electrical damage.
Verify that the module is correctly seated in the I/O slot and that the backplane connector is fully engaged.
Use shielded cabling for load cell connections to minimize electromagnetic interference (EMI) and ensure signal integrity.
Route signal wires away from high-voltage AC lines and motor control cabling.
Ensure the module is properly grounded according to the PLC-5 system installation manual to maintain measurement accuracy.
Handle with standard ESD precautions to protect internal circuitry.
FAQ
Is the 1771-WS still in production?
No, the 1771-WS has been discontinued by the manufacturer. It is primarily available through surplus or secondary market channels.
What is the input range for this module?
The 1771-WS supports an input signal range of 0 to 30 mV, suitable for standard strain-gauge load cell sensors.
Does this module require external power?
The module draws its operating power from the PLC-5 backplane at 5 VDC; ensure your power supply can accommodate the 1.5 A current draw of this module.
