1746-HSCE Allen-Bradley SLC500 High-Speed Counter

Allen-Bradley 1746-HSCE High Speed Counter Module

Product Introduction

The 1746-HSCE belongs to the Allen-Bradley SLC500 family. This unit works as a high-speed counter module for precision counting applications. It provides one bidirectional counting channel with inputs A, B, and Z. You can wire these inputs as 5VDC differential or 0-5VDC single-ended. Moreover, the maximum input frequency reaches 50 kHz. In addition, this module includes four open-collector outputs and one limit switch input. Hence, the 1746-HSCE suits motion detection, totalizing, and factory automation tasks.

Technical Specifications

For input signals, the 1746-HSCE accepts a minimum pulse width of 10 µs. Similarly, the minimum pulse separation equals 4.5 µs. Nevertheless, the input frequency range depends heavily on the operating mode. For instance, in Sequencer mode, the maximum frequency is 50 kHz. By contrast, in Range or Rate mode, it reaches only 32.767 kHz. Meanwhile, the backplane draws 320 mA at 5V DC and 0 mA at 24V DC. Isolation voltage equals 1500V. Finally, the update time is 4.8 milliseconds.

Consider the limit switch input specifications. At 5V DC nominal voltage, the ON-state range is 3.8-5.4V DC. For 12V DC nominal, that range becomes 9.4-16.5V DC. At 24V DC nominal, the range is 16.5-30V DC. Additionally, the 1746-HSCE provides four open-collector outputs. Their ON-state current ratings are 16 mA at 4.5V DC, 40 mA at 10V DC, and 125 mA at 30V DC. As a result, you can drive various loads directly. Output voltage levels depend on Switch 2 position.

Operating Modes

Three configuration modes are available on the 1746-HSCE. First, Range mode compares the count value against preset high and low limits. Second, Rate mode measures input pulse frequency over a fixed time period. Third, Sequencer mode steps through multiple output patterns based on count values. Therefore, you can adapt this module to various applications. For example, use Range mode for position tracking. Use Rate mode for flow rate monitoring. Use Sequencer mode for repetitive machine sequences.

Mechanical and Environmental Parameters

Installation is straightforward for the 1746-HSCE. This module fits into a single SLC500 chassis slot. You can place it locally next to the CPU. Alternatively, install it remotely with a communication adapter. Operating temperature ranges from 0°C to 60°C (32°F to 140°F). Storage temperature spans -40°C to 85°C (-40°F to 185°F). Furthermore, relative humidity stays between 5% and 95% non-condensing. The recommended cable is Belden 9503 or equivalent. Maximum cable length reaches 305 meters (1000 feet). For industrial environments, always use a NEMA-rated enclosure.

Diagnostic Features

Built-in diagnostic LEDs are another key feature of the 1746-HSCE. These indicators show CPU fault, fault code, and error code conditions. Additionally, an internal status word resides within the input data files. You can read this status word through your SLC500 ladder logic. Thus, troubleshooting becomes quick and efficient without extra tools.

Installation Guidelines

First, confirm compatibility between the 1746-HSCE and your SLC500 system. This module works with any SLC500 chassis. Next, select an available slot and insert the module. Then, tighten the retaining screws securely. For wiring, use Belden 9503 shielded cable. Connect differential signals to A, B, and Z terminals. For single-ended signals, connect the return to common. After that, wire the four open-collector outputs to your loads. Finally, configure the operating mode using your programming software.

Packaging List

• 1746-HSCE module – 1 unit

• Terminal block (1746-RT25G) – 1 piece

• Quick start guide – 1 copy

• Label sheet for terminal identification – 1 sheet

Note: No certificates or warranty documents are included.

Shipping Information

We ship via FedEx, UPS, or DHL. Tracking number provided after dispatch.

Frequently Asked Questions (FAQ)

1. What is the maximum input frequency of the 1746-HSCE?
The maximum frequency is 50 kHz in Sequencer mode. In Range or Rate mode, the maximum is 32.767 kHz.

2. Can the 1746-HSCE accept 24V DC input signals?
No, the counting inputs A, B, and Z accept only 5V DC differential or 0-5V DC single-ended signals. However, the limit switch input accepts up to 30V DC.

3. How many outputs does the 1746-HSCE provide?
This module provides four open-collector outputs. Their current rating varies from 16 mA to 125 mA depending on voltage.

4. What is the recommended cable for the 1746-HSCE?
Use Belden 9503 or equivalent shielded cable. The maximum cable length is 305 meters (1000 feet).

5. Does the 1746-HSCE work with remote I/O racks?
Yes, you can install it in remote SLC500 racks using a communication adapter. It works locally or remotely without performance loss.