Product Overview

The Allen-Bradley 1746-HSCE serves as a high-performance positioning module for the SLC 500 PLC platform. It provides the essential interface between high-speed field devices—such as encoders and pulse-generating sensors—and the processor backplane. This module excels in applications requiring real-time tracking of speed, length, or position. We guarantee this unit is 100% Brand New and Original, providing a critical lifeline for maintaining legacy SLC 500 architectures that demand high-speed precision.

Technical Specifications

Engineering Advantages

• Superior Noise Immunity: The 1500V industrial-grade isolation protects the SLC 500 backplane from electrical transients and common-mode noise. This ensures stable data transmission in environments with heavy motor interference.

• Long-Distance Signal Integrity: The module supports differential encoder signals over cable runs reaching 305 meters (1000 ft). This capability allows engineers to mount the PLC rack far from the mechanical drive system without sacrificing signal resolution.

• Hardware-Based Output Control: By utilizing the four onboard open-collector outputs, the 1746-HSCE triggers external hardware directly based on count presets. This bypasses the PLC scan time, providing near-instantaneous response for high-speed cutting or sorting applications.

• Operational Versatility: The hardware supports multiple counting modes—including Range, Rate, and Sequence. This flexibility allows one module to handle diverse tasks, from simple conveyor speed tachometry to complex multi-step assembly positioning.

FAQs

Can I use the 1746-HSCE to replace an existing 1746-HSC module?

The 1746-HSCE offers expanded functionality compared to the standard 1746-HSC, including more sophisticated sequencer modes and broader output voltage support. While they share the SLC 500 footprint, you must verify the I/O mapping and ladder logic configuration, as the memory map differs between these models.

What is the benefit of using the differential input mode?

Differential inputs utilize two wires per signal (A and A-not) to cancel out electromagnetic interference (EMI). We highly recommend this mode for long cable runs or installations near high-frequency drives to prevent "ghost pulses" from corrupting your position data.

Does this module require an external power supply for the encoder?

The 1746-HSCE draws its operating power from the SLC 500 backplane (320 mA). However, the external encoder and the open-collector outputs require a separate DC power source (5V, 12V, or 24V) depending on your field device specifications.

How does the 1746-HSCE handle high-speed pulse trains after the 2024 discontinuation?

Despite its discontinued status, the 1746-HSCE remains the most reliable native solution for SLC 500 systems. It continues to process high-frequency signals with the same sub-4ms throughput, ensuring your legacy machines maintain original factory performance standards.