Allen-Bradley 1746-HSCE High-Speed Counter for SLC 500 Systems

Overview

The 1746-HSCE from Allen-Bradley is a high-performance high-speed counter module for the SLC 500 programmable controller platform.
It is designed to provide rapid pulse counting, position tracking, and speed measurement for motion-oriented applications.
The module features two differential or single-ended inputs, flexible operating modes, and direct integration with PLC logic for deterministic control.

Technical Specifications

• Manufacturer: Allen-Bradley

• Model / Part Number: 1746-HSCE

• Product Type: High-Speed Counter Module

• Product Family: SLC 500 Series

• Mounting: Standard SLC chassis slot

Input Configuration

• Number of Channels: 2 independent or 1 quadrature channel

• Input Type: Differential line driver or single-ended

• Maximum Count Rate: Up to 1 MHz per channel (differential mode), 250 kHz (single-ended)

• Input Voltage: 5 V DC (TTL compatible)

• Input Impedance: 2 kΩ nominal

• Input Isolation: 500 V DC channel-to-backplane

Power Requirements

• Backplane Current @ 5 V DC: 450 mA typical

• Power Dissipation: 2.5 W max

Performance and Functions

• Count Modes: Up/Down, Quadrature, Range, and Frequency modes

• Preset and Reset: Software or external input configurable

• Latch Function: Supported for precise event capture

• Real-time Output Control: Programmable compare and gating logic

• Data Representation: 16-bit or 32-bit signed integer

• Accuracy: ±1 count at rated frequency

Environmental Characteristics

• Operating Temperature: 0 – 60 °C (32 – 140 °F)

• Storage Temperature: −40 – 85 °C (−40 – 185 °F)

• Humidity: 5 – 95 % non-condensing

• Enclosure: Open-style industrial module

Mechanical

• Weight: 0.55 kg (1.2 lb) typical

• Compatible Terminal Blocks: Standard SLC field wiring connections

Application Notes

The 1746-HSCE module is ideal for use in motion control, conveyor positioning, flow measurement, and packaging systems requiring high-speed pulse inputs.
It can interface directly with encoders, flow meters, and proximity sensors. Its deterministic response and independent channel operation make it suitable for multi-axis synchronization and event-driven automation.

FAQ

Q: What is the maximum input frequency supported by the 1746-HSCE?
A: The module supports up to 1 MHz per channel in differential mode and 250 kHz in single-ended mode.

Q: Can the 1746-HSCE operate with quadrature encoders?
A: Yes, it supports quadrature counting for position and direction detection.

Q: How many counter channels are available?
A: The module offers two individually isolated inputs that can operate independently or as a single quadrature pair.

Q: What types of sensors can be connected?
A: It is compatible with TTL, differential line-driver, and open-collector pulse sources.