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Key Technical Specifications
| Parameter | Value |
|---|---|
| Product Type | High-Speed Counter / Encoder Module |
| Catalog Number | 1746-HSCE |
| Product Family | SLC 500 |
| Counter Channels | 1 |
| Encoder Support | Incremental Quadrature (A, B, Z) |
| Maximum Input Frequency | 50 kHz |
| Counting Modes | X1, X2, X4 Quadrature |
| Counter Capacity | 16-bit (±32,768 counts) |
| Outputs | 4 Open-Collector Outputs |
| Isolation | 1,500 V |
| Operating Temperature | 0 to 60 °C |
| Product Status | Discontinued (September 30, 2024) |
The 1746-HSCE is a dedicated high-speed counter module for the Allen-Bradley SLC 500 platform. It supports quadrature encoders and high-speed pulse inputs, providing accurate position, speed, and rate measurements that exceed the capabilities of standard discrete input modules. Rockwell Automation discontinued the module on September 30, 2024 as an engineering replacement product.
Product Introduction
The Allen-Bradley 1746-HSCE is designed for applications requiring high-speed counting, encoder feedback, and motion monitoring within SLC 500 control systems. It operates independently of the PLC scan cycle, allowing reliable acquisition of high-frequency pulse signals from rotary encoders, proximity sensors, and other pulse-generating devices.
The module supports bidirectional counting, X2 and X4 quadrature decoding, programmable rate measurement, and four open-collector outputs for control or indication. It is commonly installed in packaging equipment, conveyor systems, cut-to-length machines, printing presses, and material handling systems where precise position and speed feedback are required.
1746-HSCE
1746-HSCE
Installation & Configuration Guide
Stage 1 – Pre-Installation Preparation (10 Minutes)
⚠️ Safety First
- Notify production personnel of planned downtime.
- Perform Lockout/Tagout procedures.
- Remove system power and allow capacitors to discharge.
- Verify zero voltage with a calibrated multimeter.
Required Tools
- ESD wrist strap
- Phillips screwdriver
- Digital multimeter
- Wire markers
- Laptop with RSLogix 500
Before Removal
- Upload and save the PLC program.
- Record the module slot location.
- Photograph encoder wiring and terminal assignments.
- Document counter configuration parameters.
Stage 2 – Remove Existing Module (10 Minutes)
- Disconnect encoder and field wiring.
- Label every conductor before removal.
- Release the module locking tabs.
- Pull the module straight from the chassis.
- Inspect the backplane connector for bent pins or contamination.
⚠️ Keep the original module available until the replacement has completed commissioning.
Stage 3 – Install the Replacement Module (10 Minutes)
- Verify the replacement catalog number is 1746-HSCE.
- Wear an ESD wrist strap.
- Insert the module fully into the chassis.
- Reconnect encoder, input, and output wiring.
- Confirm terminal tightening torque.
Installation Checklist
- ✅ Correct catalog number
- ✅ Encoder wiring verified
- ✅ Module fully seated
- ✅ Chassis power supply capacity confirmed
- ✅ Shield grounding inspected
Stage 4 – Power-Up & Functional Testing (10–15 Minutes)
- Restore chassis power.
- Verify module status indicators.
- Open RSLogix 500 and confirm module recognition.
- Monitor counter values during encoder rotation.
- Verify direction detection and pulse count accuracy.
- Test rate measurement and output functions.
- Return the machine to normal operation.
⚠️ If the count direction is reversed, swap encoder A and B channels rather than changing PLC logic. Incorrect encoder phasing is one of the most common commissioning issues.
Frequently Asked Questions
Can the 1746-HSCE read quadrature encoders?
Yes. It supports incremental quadrature encoders using A, B, and Z signals and provides X1, X2, and X4 decoding for improved position resolution.
What is the maximum counting frequency?
The module accepts encoder or pulse input frequencies of up to 50 kHz, making it suitable for high-speed motion monitoring applications that exceed the capabilities of standard PLC digital inputs.
Is the 1746-HSCE still manufactured?
No. Rockwell Automation discontinued the 1746-HSCE on September 30, 2024. Current availability is typically limited to new surplus inventory or professionally tested refurbished units.
Which SLC processors support this module?
The module is compatible with SLC 5/02 and later processors. It is not compatible with the 1747-ASB Remote I/O Adapter Module.
Can I use this module for simple digital counting?
Yes, but it is intended for applications where pulse rates exceed normal PLC scan capabilities or where encoder position, direction, and speed measurements are required. Using it solely for low-speed counting generally offers little advantage over standard digital inputs.
What should I verify before ordering?
Confirm the following before purchasing:
- Exact catalog number (1746-HSCE)
- SLC 500 processor compatibility
- Encoder signal voltage and wiring type
- Required counting frequency
- Available chassis slot
- Existing application configuration
Spending a few minutes confirming these details before installation can prevent communication issues, incorrect counts, and unnecessary production downtime.
