Allen-Bradley | 1794-VHSC| FLEX I/O (1794 Series)

Product Description: Allen-Bradley 1794-VHSC

The Allen-Bradley 1794-VHSC is a 2-channel Very High- Speed Counter (VHSC) input module within the FLEX I/O family, designed to support fast encoder and pulse-counting applications. Operating at up to 1 MHz input frequency, this module provides precise position and speed tracking for demanding motion applications such as packaging, conveying, and machine tooling. The 1794-VHSC integrates seamlessly with Logix platforms via FLEX I/O adapters.

Key Features

• 2 independent high-speed counter channels
• Supports quadrature, pulse/direction, and up/down encoder inputs
• Count frequency up to 1 MHz per channel
• 24V DC input signal level
• 4 digital inputs and 4 digital outputs for control functions
• Independent configuration of each channel via controller
• Compatible with all standard 1794 terminal bases and communication adapters

Technical Specifications

• Channels: 2 VHSC channels
• Input Type: Differential/single-ended (24V DC)
• Max Input Frequency: 1 MHz
• Inputs: 4 digital inputs (24V DC sink/source)
• Outputs: 4 digital outputs (24V DC sourcing)
• Counter Modes:
  • Quadrature (X1, X2, X4)
• Backplane Power: Supplied via terminal base (no external supply required for logic)
• Isolation Voltage: 50V (field-to-backplane)
• Operating Temperature: 0°C to 55°C
• Mounting: FLEX I/O terminal base (DIN rail or panel mount)
• Certifications: UL Listed, CE, CSA, RoHS, Class I Div 2

Application Areas

• High-speed motion and position tracking
• Encoder feedback for drives or mechanical axes
• Material handling and conveyor systems
• Packaging machinery requiring fast response
• OEM machine control with pulse/position input needs

Advantages

• High-frequency support enables precise motion feedback
• Reduces need for standalone counter modules or PLCs with built-in VHSCs
• Flexible configuration options support multiple encoder types
• Compact FLEX I/O format saves panel space and simplifies I/O architecture
• Easily integrates with Allen-Bradley controllers and RSLogix/Studio 5000