Product Details
Product Overview
The Allen-Bradley 1771-HT3 serves as a specialized I/O termination panel within the legacy 1771 Universal I/O chassis system. While the manufacturer officially discontinued this series on April 30, 2014, we provide 100% brand new, original factory-sealed units to support your critical infrastructure. This module streamlines the interface between field devices and PLC racks, integrating dedicated Emergency Stop (E-Stop) functionality to enhance system safety and diagnostic clarity.
Technical Specifications
| Parameter | Specification Details |
| Part Number | 1771-HT3 |
| Product Type | I/O Termination Panel |
| Compatibility | Allen-Bradley 1771 I/O Chassis |
| Safety Features | Integrated E-Stop Circuitry |
| Diagnostics | Real-time Status LED Indicators |
| Shipping Weight | 1.12 lbs (0.51 kg) |
| Manufacturer Status | Discontinued (Available as New Surplus) |
Engineering Advantages
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Simplified Troubleshooting: The onboard LED indicators provide immediate visual feedback. Technicians can identify signal status or power faults at a glance without deploying external multimeters, significantly reducing Mean Time to Repair (MTTR).
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Integrated E-Stop Logic: Unlike standard termination blocks, the 1771-HT3 incorporates E-Stop management. This hardware-level integration ensures a reliable path for emergency shutdowns, bypassing software latencies and improving local safety protocols.
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Direct Mechanical Fit: This module slides directly into standard 1771 racks. It eliminates the need for custom DIN-rail mounting or complex rewiring often required when attempting to retrofit third-party termination solutions.
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EMI/RFI Shielding: The rugged construction protects sensitive I/O signals from the electromagnetic interference common in heavy industrial environments like automotive assembly or steel mills.
FAQs
Is this unit a refurbished or used pull?
No. We supply this 1771-HT3 as a 100% brand new, original unit. Despite the manufacturer's 2014 discontinuation, our stock consists of unused surplus in original packaging to ensure maximum lifespan and reliability.
How do the LED indicators assist in high-vibration environments?
The high-visibility LEDs remain legible even in harsh conditions. They allow operators to verify I/O continuity and E-Stop status without opening secondary enclosures or disturbing wiring that might be sensitive to vibration-induced wear.
What are the primary considerations for replacing an existing 1771-HT3?
Ensure you power down the I/O chassis before installation. Because this module handles E-Stop signals, verify all safety loops are bridged or correctly wired to the new terminals to prevent unintended machine trips during the initial power-up sequence.
Additional Information
- 100% Genuine Parts: All products are original and authentic, ensuring reliable industrial performance.
- 30-Day Refund Guarantee: Return any in-stock item within 30 days in original, unopened packaging for a full refund (excluding shipping and fees).
- 12-Month Warranty: Covers defects in materials or workmanship; excludes misuse, normal wear, or unauthorized modifications.
- Worldwide Shipping: We ship via USPS, UPS, FedEx, and DHL. Delivery times vary by country and may be subject to customs or import fees.
- Support & Contact: Technical and warranty assistance is available anytime. Contact us here: Contact.
- Purchase Guidance: Check product specifications and compatibility carefully before ordering to ensure proper application.
Tech & Buying Guide
Redundant Automation Systems: Ensuring Continuous Uptime in Critical Control Infrastructure
System reliability directly determines operational profitability across high stakes process industries. Modern industrial automation platforms must eliminate single points of failure to prevent catastrophic shutdowns. Deploying fault tolerant architecture safeguards complex facilities against unexpected hardware glitches, network disruptions, and maintenance outages.
Understanding Types of Noise in Electronic Circuits and Control Systems
Signal integrity directly determines measurement accuracy and loop stability across industrial automation environments. Electronic noise introduces unwanted stochastic interference into analog loops, sensor feedback lines, and digital fieldbus networks. Understanding how intrinsic electronic noise and external electromagnetic interference manifest allows control engineers to optimize signal conditioning and shield sensitive instrumentation effectively.
Why 24V DC Power Supplies Standardize Modern Industrial Automation
Industrial control cabinets worldwide rely on 24V DC as the universal power standard for field instrumentation, sensors, and controllers. Walk into any manufacturing plant, and you will find PLCs, human-machine interfaces (HMIs), and smart actuators running on extra-low voltage DC. Standardizing on 24V DC enhances operational safety, lowers cabinet footprint, and maintains steady control performance across factory networks.