Allen-Bradley 1746-HSCE2 High-Speed Counter Module

Allen-Bradley 1746-HSCE2 SLC 500 Input Module

Product Introduction

The 1746-HSCE2 belongs to the trusted SLC 500 series from Rockwell Automation. This high-speed input module processes up to 1 MHz signals. It supports both unidirectional and quadrature counting modes. You can use it for motion control, position tracking, or high-speed event counting.

This module comes with six differential inputs: ±A1, ±B1, ±Z1, ±A2, ±B2, and ±Z2. It accepts two nominal voltage ranges: 5V DC and 24V DC. The operating range spans from 4.2V DC to 12V DC (5V nominal) and 10V DC to 30V DC (24V nominal).

Additionally, the 1746-HSCE2 provides eight outputs in total. Four are real sourcing outputs (10-30V DC, 1A max per channel). The other four are virtual outputs for internal logic use.

Key Technical Specifications

Input frequency reaches 1 MHz maximum. Minimum pulse width is just 475 ns. Phase separation requires only 200 ns. These specs make the 1746-HSCE2 suitable for very high-speed counting tasks.

The module draws 250 mA from the 5V backplane. It has no 24V backplane current draw. Update time is 1.5 milliseconds. Step response takes 100 ms for input and 2.5 ms for output.

For isolation, the backplane provides 1000V isolation. Channel-to-output isolation is rated at 500V. This ensures reliable operation in industrial environments with electrical noise.

Output and Protection Features

The real outputs are sourcing type with a range of 10-30V DC. Maximum on-state current per channel is 1.0 A. Per module, the limit is 2.0 A at 40°C and 1.5 A at 60°C. On-state voltage drop stays below 0.5V. Off-state leakage current is below 100 µA.

Short-circuit or overload triggers thermal cut-out protection. Once the cut-out temperature is reached, all outputs turn off within milliseconds. This protects both the module and connected devices.

Mechanical and Environmental Data

The 1746-HSCE2 occupies one slot in an SLC 500 chassis. It works with all SLC 500 CPU modules and the 1747-ASB remote I/O adapter. Operating temperature ranges from 0°C to 60°C. Storage temperature goes from -40°C to 85°C.

Thermal dissipation is between 1.25 W (minimum) and 5.0 W (maximum). Relative humidity should stay between 5% and 95% non-condensing. Vibration resistance meets IEC 60068-2-6 standards.

Configuration and Counting Capabilities

You can set up the 1746-HSCE2 as four pulse counters or two quadrature counters. Each counter handles up to ±8,388,607 counts (24 bits). It operates in either linear or ring counter mode.

The Z input handles store, hold, and reset functions. For low-frequency signals, false pulses may appear. To avoid this, use shielded cables and keep wiring away from noise sources.

Configuration is done through the SLC 500 processor's ladder logic. The module has a dedicated onboard processor for fast signal handling.

Installation Guidelines

Follow these steps for proper installation:

1. Remove power from the SLC 500 chassis before inserting the module.

2. Align the 1746-HSCE2 with the slot guides and press firmly.

3. Secure the module with the retaining screws.

4. Connect input signals using the 1746-RT25G removable terminal block.

5. Wire outputs according to your load requirements (10-30V DC sourcing).

6. Double-check polarity for differential signals (±A, ±B, ±Z).

Remember to use twisted-pair cables for differential inputs. Keep signal wires away from high-power cables to reduce interference.

Packaging List

• 1746-HSCE2 module – 1 unit

• 1746-RT25G removable terminal block – 1 unit

• User manual (digital download)

• Label sheet for I/O identification

Note: No certificates or warranty documents are included in the package.

Shipping Methods

We ship worldwide via FedEx, UPS, or DHL. Tracking numbers are provided within 24 hours of dispatch.

Frequently Asked Questions (FAQ)

1. Can the 1746-HSCE2 work with 5V differential encoders?
Yes. The 1746-HSCE2 accepts 4.2-12V DC for 5V nominal signals. It handles differential quadrature encoder inputs on channels A and B.

2. What is the difference between real and virtual outputs?
Real outputs are physical terminals that switch external loads (10-30V DC, 1A). Virtual outputs exist only in the module’s internal memory. They can control logic without wiring.

3. How do I reset the counter value?
You can reset it via the Z input when configured for reset function. Alternatively, use a control bit from the SLC 500 processor's output image table.

4. Is this module compatible with the 1747-ASB remote I/O adapter?
Yes. The 1746-HSCE2 works as a remote I/O component with the 1747-ASB adapter in distributed SLC 500 systems.

5. What happens if the output is short-circuited?
The module’s thermal cut-out protection activates. It shuts down all outputs within milliseconds. After cooling, normal operation resumes once the short is removed.