Allen-Bradley 1794-VHSC High-Speed Counter Module

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.