Allen-Bradley 1746-HSCE High Speed Counter Module | Replacement, Equivalent & Selection Guide
The Allen-Bradley 1746-HSCE is a dedicated High Speed Counter (HSC) module designed for the SLC 500 modular chassis. It accepts high-frequency encoder or pulse inputs and performs real-time counting, rate measurement, and position tracking — offloading these tasks from the main CPU to ensure deterministic response times in demanding motion and process applications.
Technical Specifications
| Parameter | Specification |
|---|---|
| Part Number | 1746-HSCE |
| Series / Platform | SLC 500 (1746 I/O) |
| Counter Channels | 1 high-speed counter channel |
| Max Input Frequency | Up to 1 MHz (single-ended); 250 kHz (differential) |
| Input Voltage Range | 5 V DC (TTL) / 12–24 V DC selectable |
| Counting Modes | Encoder (Quadrature A/B/Z), Pulse/Direction, Up/Down |
| Counter Register | 32-bit signed integer |
| Preset / Rollover | Programmable via RSLogix 500 |
| Output Type | 2 × solid-state outputs (sourcing, 24 V DC) |
| Backplane Current Draw | 250 mA @ 5 V DC |
| Operating Temperature | 0 °C to 60 °C |
| Dimensions (H × W × D) | Standard SLC 500 single-slot module |
| Weight | ~300 g |
| Certifications | UL, CE, CSA |
| Programming Software | RSLogix 500 / Studio 5000 (via SLC gateway) |
Compatible Replacement & Equivalent Models
When the 1746-HSCE is discontinued, hard to source, or cost-prohibitive, the following alternatives are commonly evaluated:
| Model | Brand | Platform | Max Freq. | Notes |
|---|---|---|---|---|
| 1746-HSCE2 | Allen-Bradley | SLC 500 | 1 MHz | Upgraded 2-channel version; direct drop-in upgrade |
| 1746-HSC | Allen-Bradley | SLC 500 | 250 kHz | Earlier single-channel variant; lower frequency ceiling |
| 1769-HSC | Allen-Bradley | CompactLogix | 1 MHz | Migration path to Logix platform; requires chassis change |
| IC693APU300 | GE Fanuc | Series 90-30 | 500 kHz | Cross-brand equivalent; different wiring and programming |
| QD62 | Mitsubishi | MELSEC Q | 500 kHz | Cross-brand; suitable for new installations |
| FM350-1 | Siemens | S7-300 | 500 kHz | Cross-brand; requires S7-300 rack |
Note: Cross-brand replacements require re-engineering of wiring, I/O mapping, and ladder logic. Consult your system integrator before substituting.
Why Choose the Original 1746-HSCE
- Seamless SLC 500 integration — plug-and-play into any 1746 chassis slot with no gateway or adapter required.
- RSLogix 500 native support — full configuration via familiar ladder logic; no additional software license needed.
- Proven field reliability — widely deployed in automotive, packaging, and material handling since the 1990s.
- Deterministic counting — hardware-based counting independent of CPU scan time ensures zero missed pulses.
- Dual solid-state outputs — on-board preset outputs for immediate machine response without CPU intervention.
Typical Applications
- Encoder-based position feedback for conveyor and indexing systems
- Flow meter pulse counting in water treatment and chemical dosing
- Spindle speed monitoring in CNC and machining centers
- Batch counting and packaging line control
- Web tension and dancer position control
- Turbine and gear tooth speed sensing
System Compatibility
- Chassis: All 1746 SLC 500 modular chassis (4-slot, 7-slot, 10-slot, 13-slot)
- Processors: SLC 5/03, 5/04, 5/05 (firmware 8 or later recommended)
- Software: RSLogix 500 v8.0+; APS (Advanced Programming Software) legacy
- Power Supply: Standard 1746-P series power supplies
- Not compatible with: MicroLogix 1000/1100/1400 (different backplane); ControlLogix 1756 chassis
Selection Guide
Use the decision matrix below to confirm the 1746-HSCE is the right module for your application:
| Requirement | 1746-HSCE | 1746-HSCE2 | 1769-HSC |
|---|---|---|---|
| Existing SLC 500 system | ✅ Best fit | ✅ Upgrade | ❌ Chassis change |
| Single encoder axis | ✅ | ✅ (2 channels) | ✅ (2 channels) |
| Frequency > 250 kHz | ✅ Up to 1 MHz | ✅ Up to 1 MHz | ✅ Up to 1 MHz |
| New CompactLogix project | ❌ | ❌ | ✅ Best fit |
| Budget-sensitive retrofit | ✅ Lowest cost | ⚠️ Slightly higher | ⚠️ Higher (new chassis) |
| Dual-channel counting | ❌ | ✅ | ✅ |
Quality Assurance & Sourcing
- Condition: New surplus, refurbished (tested), and used units available — specify on inquiry.
- Testing: All refurbished units undergo functional bench testing including counter accuracy verification and output relay/transistor checks.
- Warranty: 12-month warranty on new surplus; 90-day warranty on refurbished units.
- Traceability: Original manufacturer labels retained; date codes documented on request.
- Packaging: Anti-static bag + foam-lined carton; export packaging available.
- Lead Time: In-stock units ship within 1–3 business days; sourced units 5–15 business days.
How to Order
- Confirm your SLC 500 chassis slot availability and processor firmware version.
- Specify required condition: New Surplus, Refurbished, or Used As-Is.
- Contact us with your quantity, delivery address, and any special requirements (e.g., export documentation, ECCN classification).
- Receive a formal quotation within 24 business hours.
- Place order via our website or by email; payment via T/T, PayPal, or trade credit (approved accounts).
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Replacement & Compatibility FAQ
Q: Can I replace the 1746-HSCE with a 1746-HSCE2 without changing my ladder logic?
A: Mostly yes. The HSCE2 is backward-compatible in single-channel mode, but you should verify the I/O image map in RSLogix 500 as the word layout differs slightly for the second channel.
Q: Is the 1746-HSCE compatible with incremental encoders only?
A: It supports incremental quadrature encoders (A/B/Z), pulse/direction signals, and simple up/down pulse inputs. It does not support absolute encoders directly.
Q: Can I use this module in a MicroLogix 1500 system?
A: No. MicroLogix 1500 uses a different backplane and I/O expansion bus. Use the 1762-HSC for MicroLogix 1200/1500 applications.
Q: What is the maximum cable length from encoder to module?
A: Allen-Bradley recommends shielded twisted-pair cable up to 30 m (100 ft) for TTL signals. For longer runs, use differential (RS-422) signals and line drivers.
Q: Do you provide the original Allen-Bradley datasheet?
A: Yes. Contact us and we will provide the official publication 1746-UM006 user manual and wiring diagrams.
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