Product Overview
The Allen-Bradley 1746-HSCE2 is a multi-channel high-speed counter module designed for the SLC 500 system. As an intelligent input module, it handles bidirectional counting, totalizing, and position monitoring with precision. This component supports inputs ±A1, ±B1, ±Z1, ±A2, ±B2, and ±Z2, operating across two voltage ranges: 4.2V dc to 12V dc and 10V dc to 30V dc. It also includes eight outputs—four virtual and four real—with a 10-30 VDC range. For maintenance engineers, this module offers reliable performance in demanding industrial environments.
Technical Specifications Breakdown
Key parameters for the 1746-HSCE2 are listed below for quick reference:
| Feature | Specification |
|---|---|
| Manufacturer | Rockwell Automation |
| Brand | Allen-Bradley |
| Series | SLC 500 |
| Module Type | High-Speed input module |
| Inputs | ±A1, ±B1, ±Z1, ±A2, ±B2, ±Z2 |
| Nominal Input Voltage | 5VDC; 24VDC |
| Operating Voltage Range | 4.2V dc to 12V dc; 10V dc to 30V dc |
| Min. Pulse Width | 475 ns |
| Min. Phase Separation | 200 ns |
| Max. Input Frequency | 1 MHz |
| Outputs | Eight (8) outputs; Four (4) Virtual / Four (4) real |
| Output Voltage Range | 10-30 VDC |
| Backplane Current (5 Volts) | 250 milliamps |
| Update Time | 1.5 milliseconds |
| Slots | 1 |
| I/O Connection | 1746-RT25G |
Industry Applications
This module excels in high-speed counting and position monitoring tasks. In packaging lines, it tracks product flow with 1 MHz input frequency, ensuring accurate counts even at high speeds. For conveyor systems, the bidirectional counting capability allows precise material tracking. Maintenance engineers appreciate its ability to handle both single-ended and differential quadrature inputs, making it versatile for various sensor types.
Installation & Setup Guidance
Mount the module in any SLC 500 chassis slot. Connect the I/O using the 1746-RT25G cable. Ensure input signals match the operating voltage range—4.2V dc to 12V dc for 5VDC nominal, or 10V dc to 30V dc for 24VDC nominal. Configure the module for single-ended or quadrature counting as needed. For low-frequency signals, use shielded cables to avoid false pulses from noise.
Maintenance & Reliability
Inspect the module periodically for dust or debris on connectors. Verify that the backplane current draw of 250 milliamps at 5 volts stays within system limits. The module’s thermal cut-out protection safeguards against overloads, turning off outputs if temperatures exceed safe levels. Keep ambient temperatures moderate to ensure long-term reliability.
Compatibility & Integration
The 1746-HSCE2 works with all SLC 500 CPU modules and the 1747-ASB Remote I/O Adapter. It supports up to four pulse counters or two quadrature counters, each with a 24-bit range (±8,388,607). This integration allows seamless addition to existing SLC 500 systems without major reconfiguration.
Selection Guide & Purchasing Advice
When selecting this module, confirm your application requires high-speed counting up to 1 MHz. For reliable supply, choose SpareTechPLC. We stock genuine Allen-Bradley parts and provide fast shipping. Contact us to verify current lifecycle status and availability before ordering.
Troubleshooting & Common Issues
If the module fails to count accurately, check input signal quality and cable shielding. For no output response, verify the output voltage range (10-30 VDC) and ensure loads do not exceed current limits. If thermal cut-out activates, reduce ambient temperature or airflow. Always consult the manual for detailed diagnostics.
