Allen-Bradley 1746-HSCE2 | High-Speed Counter Module

Overview

The 1746-HSCE2 from Allen-Bradley is a high-speed counter module designed for SLC 500 systems. It supports up to four pulse counters or two quadrature counters, with counting ranges up to ±8,388,607 (24-bit). The module measures 11.12 × 14.3 × 2.17 inches and weighs 0.40 pounds, enabling compact installation in industrial automation racks.

Compatibility

The 1746-HSCE2 works with all SLC 500 CPUs and supports remote I/O via the 1747-ASB SLC Remote I/O Adapter. It accepts single-ended or differential quadrature inputs, interfacing with high-frequency sensors for position monitoring and totalizing applications.

Electrical Specifications

The 1746-HSCE2 handles input voltages of 4.2–12V DC (5V operation) or 10–30V DC (24V operation). It supports maximum input frequencies up to 1 MHz, with minimum pulse widths of 475 ns and phase separation of 200 ns. Each output channel delivers 5–30V DC, with maximum on-state current of 1.0 A per channel and 2.0 A per module at 40°C. The module draws 250 mA from the 5V backplane.

Performance and Protection

The 1746-HSCE2 provides update times of 1.5 ms and step responses of 100 ms input and 2.5 ms output. It features thermal cut-out protection against overload and short circuits. Isolation is 1000V across the backplane and 500V channel-to-output, ensuring safe operation in demanding industrial environments.

Physical and Additional Specifications

The 1746-HSCE2 occupies standard SLC 500 rack slots and dissipates 1.25 Watts of thermal energy. It offers a robust and compact design for high-reliability applications, ensuring stable performance in harsh conditions.