Allen-Bradley 1771-HSARS Servo Controller Module

1771-HSARS IMC-120AR Servo Controller by Allen-Bradley

Product Introduction

The Allen-Bradley 1771-HSARS servo controller module is a compact yet powerful motion solution from the PLC-5 series. This IMC-120AR module occupies just one slot in a Bulletin 1771 I/O chassis, making it ideal for systems with limited rack space. It features advanced ratioing capability for coordinated multi-axis motion and uses a standard 1771-HMA plug-in memory cartridge for program storage. The module outputs ±10V DC analog commands, accepts differential encoder inputs up to 250 kHz, and updates each axis within 2 ms. With its 1771-WA and 1771-WB wiring arms, the 1771-HSARS allows for module replacement without disconnecting field wiring, significantly reducing downtime.

Technical Specifications

The 1771-HSARS delivers a strong set of technical attributes tailored for high-speed information processing. Its maximum differential input frequency reaches 250 kHz, while the analog command outputs supply a ±10V DC range, ensuring compatibility with various servo drives and actuators. The fuse voltage is rated at 120 volts for internal circuit protection.

For power, the module draws 1.7 amperes from the backplane and operates with a 120V AC supply. The pulse capture time ranges from 50 to 9,999 microseconds, providing fine resolution for position event detection. Notably, the 1771-HSARS is a Series B module, indicating enhanced reliability and performance over earlier revisions.

Additionally, this module includes advanced ratioing capability. This feature allows the controller to synchronize multiple axes with precise electronic gearing, making it suitable for complex applications like print registration, web handling, and synchronized conveyor systems.

Memory and Storage Features

The 1771-HSARS uses a standard 1771-HMA plug-in memory cartridge for storing application programs and AMP parameters. This cartridge is easily removable and replaceable, allowing quick program changes without requiring a computer. The memory retains data reliably during power cycles, ensuring consistent operation across production runs.

Mechanical and Environmental Parameters

Physically, the 1771-HSARS measures 3.5 x 6.5 x 2.0 inches (89 x 165 x 51 mm) and weighs approximately 2.2 lbs (1.0 kg). Unlike many other servo controllers, this module requires only a single slot in the 1771 I/O chassis, freeing up valuable rack space for additional I/O modules.

Its operating temperature ranges from 0 to 60°C (32 to 140°F), with a relative humidity range of 5-95% (non-condensing). The module withstands operating shocks up to 30g, making it robust enough for demanding industrial environments. These ratings ensure dependable performance in typical factory floor conditions, from clean assembly lines to light-duty machining areas.

Installation Guidance

Installing the Allen-Bradley 1771-HSARS is straightforward due to its single-slot design. First, ensure the 1771 I/O chassis is powered off. Insert the module into any available slot, aligning it carefully with the backplane connectors. The single-slot footprint simplifies installation and leaves more room for other modules.

For field wiring, attach the 1771-WA and 1771-WB wiring arms to the module. These arms enable you to disconnect and reconnect wiring without removing individual terminals, which is especially useful during module replacement or maintenance. Connect the power supply (120V AC) to the appropriate terminals, and wire your servo drives and actuators to the analog command outputs.

After physical installation, insert the 1771-HMA memory cartridge with your pre-loaded program. The RS-232 port (standard on this series) allows for program uploads and debugging if needed. Finally, power on the chassis and verify the LED indicators for normal status. These LEDs provide clear feedback on power, communication, and axis activity.

Packaging List

Your shipment of the 1771-HSARS includes the following items:

• 1771-HSARS IMC-120AR servo controller module

• 1771-WA wiring arm for field terminations

• 1771-WB wiring arm (additional arm for flexible wiring)

• 1771-HMA plug-in memory cartridge (standard, pre-installed or included separately)

• Quick start guide (printed)

• Installation instructions manual

Note: Certificates and warranty documents are not included in this package.

Shipping Information

All orders are shipped via FedEx, UPS, or DHL to ensure fast and reliable delivery. Tracking numbers will be provided once your order leaves our warehouse.

Frequently Asked Questions (FAQ)

1. How many slots does the 1771-HSARS require?
Unlike most servo controllers, the 1771-HSARS occupies only one slot in a 1771 I/O chassis, saving valuable rack space.

2. What is advanced ratioing capability?
This feature allows the 1771-HSARS to synchronize multiple axes with electronic gearing, ideal for print registration and web handling applications.

3. Which memory cartridge does this module use?
It uses the standard 1771-HMA plug-in memory cartridge for storing programs and AMP parameters.

4. Can I replace the module without rewiring?
Yes, the 1771-WA and 1771-WB wiring arms let you disconnect and reconnect wiring easily, enabling quick module swaps.

5. What is the update period per axis?
The 1771-HSARS provides a fast 2 ms update period for each axis, ensuring responsive and precise motion control.