Product Overview
When precision motion control is critical in PLC-5 based systems, the Allen-Bradley 1771-HSN servo controller module delivers reliable, high-speed performance. As part of the PLC-5 IMC 120 family, this module coordinates servo axes with the processor, enabling complex motion profiles in demanding industrial applications. The 1771-HSN does not include a memory cartridge; it requires an Allen-Bradley 1771-HM or 1771-HMA plug-in cartridge to store motion programs. This Series B module is UL listed and CSA certified, ensuring compliance with North American safety standards.
Technical Specifications
The Allen-Bradley 1771-HSN is engineered for precise servo control, with specifications tailored for high-speed, multi-axis applications. Key parameters include:
| Parameter |
Value |
| Manufacturer |
Rockwell Automation |
| Brand |
Allen-Bradley |
| Part Number |
1771-HSN |
| Module Type |
Servo Controller Module |
| Fuse Voltage |
120 Volts |
| Max Input Frequency |
250 Kilohertz Differential Input |
| Outputs |
±10 Volt DC Analog Command |
| Slots |
2 Slots Per ES |
| Module Update Period |
2 ms/axis |
| Backplane Current |
1.7 Amperes |
| Wiring Arm |
1771-WA |
| Pulse Capture Time |
50-9.999 Microseconds |
| Dimensions |
3.5 x 6.5 x 2.0 in (89 x 165 x 51 mm) |
These specifications enable the 1771-HSN to provide fast, accurate servo control while drawing minimal backplane current. The 250 kHz differential input frequency supports high-resolution encoder feedback, while the ±10 V DC analog command outputs interface directly with servo drives.
Key Features & Benefits
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High-Speed Input: 250 kHz differential input captures rapid position feedback for precise motion control.
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Fast Update Period: 2 ms per axis ensures responsive loop closure, critical for multi-axis synchronization.
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Flexible Wiring: Comes with 1771-WA and 1771-WB wiring arms, allowing module replacement without disconnecting wiring.
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Compact Design: Occupies a single slot in a 1771 I/O chassis, saving valuable panel space.
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Certified Quality: UL listed and CSA certified for reliable operation in industrial environments.
Industry Applications
The Allen-Bradley 1771-HSN excels in applications requiring coordinated motion and high-speed processing. Typical use cases include:
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Packaging Machinery: Synchronizing multiple servo axes for precise cut-to-length and registration control.
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Material Handling: Coordinating conveyor speed with robotic pick-and-place operations.
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Machine Tools: Providing accurate axis positioning for milling, drilling, and turning operations.
In each scenario, the 1771-HSN's fast update period and high input frequency enable smooth, synchronized motion, reducing cycle times and improving product quality.
Installation & Setup
Installing the Allen-Bradley 1771-HSN is straightforward. Follow these steps for a successful setup:
- Ensure the 1771 I/O chassis is powered down.
- Insert the 1771-HSN into a single slot, aligning it with the backplane connector.
- Attach the 1771-WA wiring arm to the module's front connector.
- Connect servo drive command wires to the ±10 V DC analog outputs.
- Install a 1771-HM or 1771-HMA memory cartridge (not included) into the module's cartridge slot.
- Power up the system and configure the module's parameters via the PLC-5 processor.
Always verify that the backplane current does not exceed the chassis rating. The 1771-HSN draws 1.7 A, so plan your power budget accordingly.
Maintenance & Reliability
Routine maintenance for the 1771-HSN is minimal, but regular inspection ensures long-term reliability. Check the wiring arms for loose connections, verify that the memory cartridge is seated properly, and keep the module free from dust and debris. The module operates in a clean industrial environment with a temperature range of 0–60 °C (32–140 °F), noncondensing relative humidity of 5–95%, and a 30g operating shock rating. By adhering to these environmental limits, you can maximize the module's service life and minimize unexpected downtime.
Compatibility & Integration
The 1771-HSN is designed for use with PLC-5 controllers in a 1771 I/O chassis. It communicates with the processor over the backplane, and the PLC-5 system supports a variety of networks, including DH+, ControlNet, and EtherNet/IP, enabling seamless integration into existing plant architectures. The module requires a 1771-HM or 1771-HMA memory cartridge to store motion programs, so ensure you have the appropriate cartridge on hand.
Buying Guide
Before purchasing the Allen-Bradley 1771-HSN, verify that your system has an available slot in a 1771 I/O chassis and that your PLC-5 processor supports servo modules. Also, confirm that you have the required 1771-HM or 1771-HMA memory cartridge, as it is not included. At PLC Source PRO, we offer genuine Allen-Bradley 1771-HSN modules with fast shipping and competitive pricing. Our knowledgeable team can help you confirm compatibility and answer any technical questions.