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Product Introduction
The Allen-Bradley 1771-VHSC Very High Speed Counter Module is a specialized module designed for the Allen-Bradley 1771 PLC-5 I/O System. It provides very high-speed counting capability for industrial automation applications that require precise measurement of fast pulses or high-frequency signals.
The module features 4 independent counting channels and 8 digital outputs, operating at 24 VDC with a 4 mA load per output. It is suitable for applications involving rotary encoders, pulse sensors, or high-speed production monitoring, offering precise and reliable counts for process control, motion control, and automation systems.
The 1771-VHSC is valued for its ability to handle high-speed signal inputs with minimal processing delay, enabling accurate counting and output generation in demanding industrial environments.
Product Specifications
| Parameter | Specification |
|---|---|
| Model | 1771-VHSC |
| Brand | Allen-Bradley |
| Module Type | Very High Speed Counter Module |
| Series | 1771 PLC-5 I/O Series |
| Channels | 4 |
| Outputs | 8 digital |
| Output Voltage | 24 VDC |
| Output Current | 4 mA |
| Installation Method | 1771 I/O Chassis Mount |
| Application Type | High-speed counting and pulse processing |
| Dimensions | 165 × 51 × 89 mm |
| Weight | 0.45 kg |
Applications
• High-speed counting in production systems
Ideal for rotary encoders, flow meters, or high-speed machinery requiring precise pulse counting.
• Motion control applications
Supports positioning, speed monitoring, and incremental measurement in automated systems.
• Industrial automation control
Used to monitor conveyor speeds, production cycles, and repetitive machine operations with high accuracy.
• Process control systems
Counts pulses from sensors to measure flow, rotation, or other high-frequency signals in process industries.
• Pulse-based signal monitoring
Suitable for applications where fast and accurate pulse detection and output is critical to system operation.
Advantages
• Very high-speed pulse counting
Capable of processing fast input signals with minimal delay for accurate measurement.
• Multiple independent channels
Four channels allow simultaneous counting for different sensors or processes.
• Digital outputs for control
Eight 24 VDC outputs enable direct control or signaling based on counted pulses.
• Compact and lightweight
Small form factor (165 × 51 × 89 mm) and 0.45 kg weight allow easy installation in PLC racks.
• Reliable industrial design
Built to withstand electrical noise and industrial environmental conditions.
• Seamless integration with 1771 I/O systems
Compatible with PLC-5 backplane and modules for straightforward integration.
