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
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Marshalling Cabinet Preventive Maintenance: Essential Healthiness Checks for PLC, DCS, and ESD Systems
Marshalling cabinets serve as the vital interface between field instrumentation and control room electronics in modern process facilities. Regular preventive maintenance of these cabinets ensures signal integrity across programmable logic controllers (PLCs), distributed control systems (DCS), and emergency shutdown (ESD) networks. System technicians must execute structured inspection protocols to mitigate environmental risks, identify loose wiring, and maintain continuous operational readiness.
Spatial Computing in Industrial Automation: Elevating PLC and DCS Operations with AR and VR
Industry 4.0 integrates digital intelligence into field operations, transforming factory automation landscapes worldwide. Spatial technologies—specifically Augmented Reality (AR) and Virtual Reality (VR)—redefine how engineers interact with industrial control systems. By bridging computer-generated CAD models with real-time operational technology (OT) data, immersive displays enable intuitive monitoring, rapid diagnostics, and safer maintenance across complex processing facilities.