Allen-Bradley 1756-HSC ControlLogix 2-Channel High-Speed Counter Module – 1 MHz Input

Product Overview

The Allen-Bradley 1756-HSC is a ControlLogix-series High-Speed Counter module manufactured by Rockwell Automation. It provides two independent high-speed counter channels designed to interface directly with incremental encoders and pulse-generating devices for precise position and speed monitoring. The module supports multiple operating modes including quadrature counting, rate measurement, and frequency mode. It features four dedicated digital outputs that can be programmed to trigger at specific preset values, enabling microsecond-level closed-loop control independent of the controller’s scan time.

Category: FUJI

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Description

Technical Specifications

I/O Configuration: 2 counters (each with A, B, Z inputs) and 4 digital outputs (2 points/group).
Performance: Max input frequency 1 MHz in counter mode, 500 kHz in rate mode, 250 kHz in encoder mode.
Electrical: 5V/24V DC selectable inputs; outputs rated for 1A @ 10-31.2V DC. Draws 300mA @ 5.1V from backplane.
Physical: Fits 1 slot width in 1756 chassis; uses 1756-TBCH or 1756-TBS6H removable terminal blocks.

Main Features and Advantages

Flexible Counting Modes: Supports X1/X4 quadrature decoding, pulse+direction, and continuous frequency measurement.
Hardware-Based Outputs: Each output can be assigned two turn-on and two turn-off preset values for camming applications.
Noise Immunity: Features 125V continuous isolation from field inputs to backplane and configurable input filtering.
Seamless Integration: Automatically maps data structures to Studio 5000 / RSLogix 5000 tags for easy programming.

Application Field

The 1756-HSC is ideal for applications requiring accurate tracking of high-speed rotary motion or linear displacement. Common uses include monitoring servo motor feedback, length measurement on conveyor systems, product counting from photoelectric sensors, and synchronized cut-to-length operations in packaging machinery.