1746-HT | Allen-Bradley SLC 500 High-Speed Counter/Encoder Interface Module

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

Engineering Advantages

• 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.

• 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.

• 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.

• 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.

• 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

• 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.

• 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.

• 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.

• 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.