Allen-Bradley 1746-HSCE2 Overview
The Allen-Bradley 1746-HSCE2 is a multi-channel high-speed counter module designed for the SLC 500 family. It provides precise counting, totalizing, and position monitoring in demanding industrial environments. This intelligent module handles signals up to 1 MHz, making it suitable for high-speed applications.
Key Technical Specifications
The 1746-HSCE2 features six inputs: ±A1, ±B1, ±Z1, ±A2, ±B2, and ±Z2. It accepts input voltages from 4.2V DC to 12V DC (at 5V nominal) and 10V DC to 30V DC (at 24V nominal). The module supports both single-ended and differential quadrature inputs, offering flexibility for various encoder types.
With a minimum pulse width of 475 ns and a minimum phase separation of 200 ns, the module ensures reliable counting at high speeds. It includes eight outputs: four virtual and four real, each rated for 5-30 VDC sourcing. The real outputs can handle up to 1.0 A per channel, with a maximum on-state current of 2.0 A per module at 40°C.
Counting Capabilities and Configuration
You can configure the 1746-HSCE2 as four pulse counters or two quadrature counters. Each counter supports 24-bit counting up to ±8,388,607, with linear or ring counter modes. The dedicated processor handles signal processing, reducing the load on the SLC 500 CPU.
The module's Z inputs manage storing, holding, and resetting counter data. For low-frequency signals, the module may pick up false pulses, so proper cable shielding is essential. The thermal cut-out protection shuts down all channels within milliseconds if overloaded, safeguarding the module and connected equipment.
Integration and Compatibility
This module fits into a single slot of an SLC 500 chassis and draws 250 mA from the 5V backplane. It works with all SLC 500 CPUs and supports remote I/O via the 1747-ASB adapter. The backplane isolation is 1000V, and channel-to-output isolation is 500V, ensuring robust performance in noisy industrial settings.
The update time is 1.5 ms, with a step response of 100 ms in and 2.5 ms out. The module's typical throughput is 700 µs, and it dissipates a maximum of 1.25 Watts. For wiring, use the 1746-RT25G I/O connection cable.
Practical Applications
Engineers commonly use the 1746-HSCE2 in packaging, material handling, and machine control where precise speed or position feedback is critical. Its ability to count in both directions and handle high frequencies makes it ideal for encoder feedback and motion control applications.
The module's flexibility with different input voltage ranges and output configurations allows seamless integration into existing systems. Whether you're upgrading an existing SLC 500 setup or building a new control panel, the 1746-HSCE2 offers reliable performance.
Final Thoughts
The Allen-Bradley 1746-HSCE2 delivers robust features for high-speed counting in the SLC 500 platform. Its intelligent design, combined with multiple counting modes and protective features, ensures dependable operation. For engineers seeking a proven solution, this module is a solid choice.
When purchasing, verify that your system meets the voltage and current requirements. With proper installation and maintenance, the 1746-HSCE2 will serve your automation needs effectively.