The Allen-Bradley 1771-HS3A servo controller module is a high-performance motion control solution designed for the PLC-5 product line. This 3-axis module fits directly into a Bulletin 1771 I/O chassis and requires the 1771-PS7 power supply for operation. It handles resolver-based feedback with sine/cosine excitation and also accepts encoder inputs up to 250 kHz. The module outputs ±10V DC analog signals to command actuators, solenoids, and motor starters. With a rapid 2 ms/axis update period, the 1771-HS3A ensures responsive and accurate axis control in demanding industrial environments.
The 1771-HS3A offers a robust set of technical features that make it a versatile choice for multi-axis applications. Its maximum input frequency reaches 250 kHz for differential encoder signals, while single-ended inputs operate at 20 kHz. The analog command outputs provide a ±10V DC range, enabling compatibility with a wide variety of servo drives and amplifiers.
For power, this module draws 1.7 amperes from the backplane and relies on the 1771-PS7 power supply (120-240V AC, 1-2A). The fuse voltage is rated at 120 volts, protecting the internal circuitry from overcurrent conditions. Additionally, the module uses a 9-pin 1771-CAS cable for power connections and supports 1771-HMA 96 KB battery-backed memory cartridges to store AMP parameters and MML programs.
Furthermore, the 1771-HS3A provides flexible feedback options. It includes a resolver excitation module that generates sine and cosine signals to energize the resolver stator. It also delivers 10V DC isolated encoder outputs for clean signal transmission. The pulse capture time ranges from 50 to 9,999 microseconds, giving users fine-grained control over position events.
Physically, the 1771-HS3A measures 3.5 x 6.5 x 2.0 inches (89 x 165 x 51 mm) and occupies two slots per expansion chassis. Its operating temperature spans 0 to 60°C, with an ambient relative humidity range of 5-95% (non-condensing). These ratings ensure reliable performance in typical factory floor conditions. Moreover, the module carries c-UL, C-TICK, and CE certifications, confirming its compliance with international safety and electromagnetic compatibility standards.
Installing the Allen-Bradley 1771-HS3A is straightforward when following standard chassis procedures. First, ensure the 1771 I/O chassis is powered off. Then, insert the module into an available slot pair, taking care to align it with the backplane connectors. Next, connect the 1771-PS7 power supply using the 1771-CAS cable to the controller’s power connector. For wiring field devices, use the 1771-WA wiring arm, which simplifies connections to solenoids, indicators, and AC motor starters.
After physical installation, attach the encoder and resolver feedback cables to their respective ports. The RS-232 connector allows a direct link to T45 or T50 ODS terminals for programming. Optionally, you can connect a hand-held pendant through the ODS to modify system variables and parameters interactively. Finally, power on the chassis and observe the LED indicators to confirm normal status. These LEDs provide real-time feedback on module health, communication, and axis activity.
Your shipment of the 1771-HS3A includes the following items:
1771-HS3A servo controller module (3-axis)
1771-WA wiring arm for field terminations
1771-HMA 96 KB battery-backed memory cartridge
1771-CAS 9-pin power connection cable
Quick start guide (printed)
Installation instructions manual
Note: Certificates and warranty documents are not included in this package.
We ship all orders via FedEx, UPS, or DHL to ensure fast and reliable delivery. Tracking numbers will be provided once the shipment leaves our warehouse.
1. Which power supply is required for the 1771-HS3A?
The module specifically needs the 1771-PS7 power supply, which accepts 120-240V AC at 1A or 2A output.
2. Can I use this module with single-ended encoders?
Yes, the 1771-HS3A supports single-ended encoder inputs at 20 kHz, in addition to differential inputs at 250 kHz.
3. What memory cartridge does the 1771-HS3A accept?
It uses the 1771-HMA battery-backed cartridge with 96 KB capacity for storing AMP parameters and MML programs.
4. How do I adjust parameters without a computer?
You can connect an optional hand-held pendant via the ODS terminal and modify variable values directly on the shop floor.
5. What is the update period per axis?
The 1771-HS3A provides a fast 2 ms update period for each axis, ensuring responsive motion control.
| Brand Name | |
| Model No. | 1771-HS3A |
| Product Type | Servo Controller Module |
| hasMerchantReturnPolicy | Adjust according to reality |
| Shippingdetails | Adjust according to reality |
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