Overview
The Allen-Bradley 1746-HSCE2 is a multi-channel high-speed counter module designed for SLC 500 programmable logic controller systems. This intelligent module enables precise counting and position monitoring in automation applications requiring fast pulse capture from encoders, switches, and sensors. The 1746-HSCE2 supports bidirectional counting and features dual-channel operation modes, making it ideal for motion control, packaging, material handling, and conveyor systems.
Key Features
- Multi-channel counting: Up to 4 single-ended pulse counters or 2 quadrature encoder inputs
- High counter range: Counts to ±8,388,607 (24-bit) in ring or linear mode
- Fast pulse capture: 1 MHz input frequency response with 0.7–1.6 ms backplane response time
- Flexible I/O: 4 real + 4 virtual outputs (5–30 VDC sourcing); configurable for 16 count/rate modes
- Robust isolation: 1000V galvanic isolation between input and system
- Preset inputs: Dedicated preset capability for Counters 1 and 2
- Bidirectional operation: Detects motion in either direction; x2 and x4 counting modes for quadrature encoders
Technical Specifications
- Module Type: SLC 500 Input/Output
- Series: 1746 (SLC 500)
- Operating Class: Class 1 or Class 4 (configurable via ID code)
- Input Voltage: 4.2–30 VDC (dual range: 4.2–12 VDC and 10–30 VDC)
- Output Current: 1 Ampere maximum per output
- Input Frequency: 1 MHz
- Backplane Response Time: 0.7–1.6 milliseconds
- Counter Capability: 24-bit (±8,388,607)
- Isolation Voltage: 1000V tested
- Backplane Current (5V): 250 mA; (24V): 0 mA
- Throughput: Typical 700 µs
- Thermal Dissipation: 1.25 Watts maximum
- Operating Temperature: 0–60°C
- Weight: 0.49 lbs
- Mounting: SLC 500 chassis slot
Typical Applications
The 1746-HSCE2 excels in applications requiring fast, reliable pulse counting and position tracking:
- Motion control: Real-time feedback from rotary encoders in servo-driven systems
- Packaging machinery: Precise product counting and synchronization on high-speed lines
- Material handling: Conveyor position monitoring and sorted discharge control
- Assembly systems: Part alignment and sequential indexing with quadrature encoders
- Print and label systems: Web position tracking and cut synchronization
- Discrete process control: Event counting from proximity or inductive sensors at speeds up to 1 MHz
Compatibility & Replacements
Compatible With
- All SLC 500 CPU modules and processors (SLC 5/02 and above)
- SLC 500 family I/O chassis and backplane
- RS-Logix 500 programming software (Class 1 operation: ID code 3511)
- Allen-Bradley encoders with quadrature or pulse outputs
- High-speed switches, proximity sensors, and inductive transducers up to 1 MHz
Replaces / Drop-In Replacement For
- Allen-Bradley 1746-HSCE (earlier revision; verify ID code compatibility)
- Verify specific compatibility with your system integrator before ordering
Works With
- Software: RS-Logix 500, AutomationStudio (legacy SLC 5 platforms)
- Protocols: SLC 500 backplane (not compatible with 1747-ASB Remote I/O Adapter)
- Encoder types: Single-ended pulse, quadrature (x1, x2, x4 modes), and specialized Allen-Bradley encoder connectors
- Integration: Programmable presets, counter reset, and rate measurement modes via ladder logic
