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Allen-Bradley 1794-VHSC High-Speed Counter Module

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Allen-Bradley 1794-VHSC High-Speed Counter Module

The Allen-Bradley 1794-VHSC delivers exceptional high-speed counting performance for demanding motion control applications. This advanced Flex I/O module handles frequencies up to 1 MHz with precise accuracy. 

Input Channel Capabilities

  • Module features two completely independent input channels for flexibility
  • Each channel provides two groups of three inputs for comprehensive counting
  • Standard 5V DC input voltage with 15-24V DC termination options
  • Low OFF-state voltage below 1.8V DC ensures reliable signal detection
  • Minimal OFF-state current under 0.25 mA for power efficiency
  • Positive ON-state current above 5 mA for secure signal recognition
  • High-speed input frequency capability up to 1 MHz for rapid counting

Output Channel Performance

  • Module includes two isolated output groups with two outputs each
  • Wide output supply range from 10-31V DC (5-7V DC for 5V termination)
  • Substantial output current of 0.5A at 5V DC for various loads
  • Higher output current of 1.0A at 12-24V DC for demanding applications
  • Minimal OFF-state leakage current below 300 µA for efficiency
  • Low voltage drop of 0.9V DC at rated current for performance

Power Management

  • Efficient FlexBus current draw of 75 mA at 5V DC
  • Standard 24V DC nominal external power supply requirement
  • Flexible external supply range from 19.2-31.2V DC
  • Moderate external supply current of 100 mA at 24V DC
  • Controlled power dissipation of 5.0 W at 31.2V DC
  • Effective thermal dissipation of 17.1 BTU/hour at maximum voltage

Frequently Asked Questions

  • What is the maximum frequency this module can count? The 1794-VHSC handles input frequencies up to 1 MHz for high-speed applications.
  • How many independent channels does it have? This module provides two completely independent counting channels.
  • What voltage ranges does it support? It operates with 5V DC inputs and supports 10-31V DC output supplies.
  • What is the output current capability? Outputs deliver 0.5A at 5V DC or 1.0A at 12-24V DC depending on configuration.
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