
Product Summary
The Allen-Bradley 1771-HSARS is a PLC-5 IMC 120 AR servo controller module designed for high-speed motion. This module occupies just one slot in a 1771 I/O chassis. It integrates advanced ratioing capability and a standard plug-in memory cartridge for efficient operation. It provides precise control for complex automation tasks.
Expert Technical Evaluation & Performance Review
The 1771-HSARS module delivers exceptional performance for demanding motion control applications. It accepts a 250 Kilohertz differential maximum input frequency for high-resolution feedback. The module outputs a +/- 10 Volt DC analog command signal to drive servo drives. This configuration allows for precise velocity and position control in real-time.
This module features a rapid update period of just 2 milliseconds per axis. This speed enables tight coordination between the processor and the servo loop. The backplane current draw is a modest 1.7 Amperes, ensuring low power consumption. The pulse capture time ranges from 50 to 9.999 microseconds for accurate event timing. These specifications make it ideal for high-speed information processing.

The unit operates reliably in a clean, dry industrial environment. Its operating temperature range spans from 0 to 60 degrees Celsius. The module can withstand a 30g operating shock without performance degradation. It also tolerates relative humidity levels from 5 to 95 percent noncondensing. This durability ensures long-term stability in harsh factory conditions.
The module uses a standard 1771-HMA plug-in memory cartridge for configuration storage. This design simplifies program changes and system upgrades. The module also includes 1771-WA and 1771-WB wiring arms for easy replacement. These arms allow technicians to swap the module without disconnecting field wiring. This feature significantly reduces downtime during maintenance procedures.
The 1771-HSARS is a Series B module with a fuse voltage rating of 120 Volts. It integrates seamlessly with the larger PLC-5 controller platform. This system supports various communication networks like DH+ and ControlNet. The module is perfect for large regulatory and sequential control applications. It excels in applications requiring specialized I/O and processor coordination.
Step-by-Step Installation Guide

First, ensure the Bulletin 1771 I/O chassis is powered down completely. Select a single empty slot within the chassis for the module. Align the module’s circuit board with the chassis card guides. Slide the 1771-HSARS firmly into the slot until it seats properly. Secure the module’s top and bottom retaining screws.
Next, connect the 1771-WA and 1771-WB wiring arms to the module’s front connector. These arms allow for pre-wiring of field devices before module insertion. Wire the differential encoder signals to the appropriate terminals on the arm. Connect the +/- 10 Volt DC analog command outputs to your servo drive. Verify all connections are tight and match the system schematic.
Finally, power up the chassis and verify the module’s status indicators. The module requires a maximum input frequency of 250 Kilohertz for proper feedback. Configure the motion profile using the standard plug-in memory cartridge. Set the update period to 2 ms/axis for optimal servo loop performance. Test the system by executing a simple move command to confirm operation.
Logistics & Standard Packaging Details

- One (1) Allen-Bradley 1771-HSARS Servo Controller Module
- One (1) Standard 1771-HMA Plug-in Memory Cartridge
- One (1) 1771-WA Wiring Arm Assembly
- One (1) 1771-WB Wiring Arm Assembly
- Product documentation and installation guide
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