Product Details
Product Overview
The Allen-Bradley 1746-HT functions as a specialized high-speed interface module within the SLC 500 platform. This module bridges the gap between high-frequency field encoders and the PLC processor, enabling precise tracking of position, velocity, and count data. We supply this hardware as 100% Brand New original factory stock. It processes input frequencies up to 250 kHz, providing the deterministic response required for high-speed packaging, turbine flow metering, and material cut-to-length applications that standard digital input cards cannot handle.
Technical Specifications
| Feature | Specification |
| Manufacturer | Allen-Bradley / Rockwell Automation |
| Product Line | SLC 500 |
| Module Type | High-Speed Counter / Termination Interface |
| Input Frequency (Max) | 250 kilohertz (kHz) |
| Backplane Current (5V) | 200 milliamps |
| Backplane Current (24V) | 90 milliamps |
| Step Response (Input) | 100 milliseconds |
| Step Response (Output) | 2.5 milliseconds |
| Slot Occupancy | 1 Slot (1746 Chassis) |
| I/O Connection | 1746-HT and 1746-HCA Support |
| Weight | 0.88 lbs (0.40 kg) |
Engineering Advantages
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High-Frequency Pulse Processing: The 1746-HT captures pulses at rates up to 250 kHz. This allows the SLC 500 system to monitor high-resolution optical encoders and flow sensors accurately, ensuring zero pulse loss during rapid mechanical cycles.
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Rapid Output Execution: With a 2.5 ms output step response, the module triggers downstream actuators almost instantaneously based on specific count values. This hardware-level speed bypasses typical PLC scan time delays, which is critical for precision sorting and high-speed labeling.
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Seamless Chassis Integration: The module occupies a single slot in any standard 1746 SLC chassis. It draws power directly from the backplane (200mA @ 5V), eliminating the need for external power supplies for the module's internal logic.
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Reliable Termination Architecture: Designed to work alongside the 1746-HCA cable, the 1746-HT provides a stable termination point for shielded encoder wiring. This configuration minimizes signal noise and prevents data corruption in environments with high electromagnetic interference from nearby motor drives.
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Rugged SLC 500 Reliability: The hardware withstands the vibration and thermal fluctuations common in industrial control cabinets. Its passive cooling design ensures continuous operation without the risk of fan failure or overheating in enclosed spaces.
FAQs
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Does the 1746-HT require a specific cable for connection?
Yes. The module typically utilizes the 1746-HCA cable assembly to interface between the termination panel and the encoder. Ensure you use high-quality shielded cabling to maintain signal integrity at 250 kHz frequencies.
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Can I use this module in a MicroLogix system?
No. The 1746-HT is specifically designed for the SLC 500 1746-style chassis. While some MicroLogix 1500 systems use 1769-style expansion, they do not natively support the 1746 backplane modules.
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What type of sensors work with the 1746-HT?
The module accepts signals from incremental encoders, high-speed proximity switches, and pulse-output flow meters. It handles digital inputs and provides digital output control based on programmed count thresholds.
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How do I verify this is a 100% Brand New unit?
We guarantee every 1746-HT arrives in its Original Allen-Bradley Factory Box with intact security seals. As a new unit, the gold-plated backplane connectors remain free of insertion scratches, and the circuit board shows no thermal discoloration from previous use.
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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Understanding Safety Relays in Industrial Automation: Architecture, Operation, and Functional Safety
Standard electromechanical relays provide basic electrical isolation between low-voltage control circuits and high-power output loads. A traditional switching relay features a magnetic coil driving mechanical Common (COM), Normally-Open (NO), and Normally-Closed (NC) contacts. However, standard relays pose severe functional risks when deployed in critical safety interlock circuits. High current inrush or mechanical wear can weld contacts together permanently. If contact welding occurs in an emergency stop circuit, pressing the button fails to halt hazardous machinery movements. Consequently, global functional safety standards prohibit standard relays for critical machine guarding functions.
Mastering Wire Identification in Industrial Automation: The Power of Ferrules and Cross-Ferruling
Proper wire labeling forms the cornerstone of reliable control system installation and long-term maintenance. In complex industrial automation environments, technicians terminate thousands of conductor ends inside control panels, marshalling racks, and field junction boxes. Ferrules serve as individual tube-shaped sleeve markers slipped onto conductors before final termination. While technicians historically relied on pre-printed individual letter rings, modern control panel builders utilize automated ferrule printing machines. These thermal-transfer printers generate durable, single-sleeve heat-shrink tags directly matching approved wiring schematics, significantly accelerating cabinet assembly workflows.