1794-VHSC Allen-Bradley Flex I/O Very High Speed Counter

1794-VHSC Flex I/O Very High Speed Counter Module by Allen-Bradley

Key Technical Specifications

• Manufacturer: Allen‑Bradley
• Part Number: 1794-VHSC
• Input Channels: 2 (each with 2 groups of 3 inputs)
• Input Voltage: 5V DC or 15‑24V DC (depending on terminal base)
• Input Frequency: Up to 1 MHz (counter‑dependent)
• Input Off‑state Voltage: <1.25V DC (5V termination) / <1.8V DC (15‑24V termination)
• Input Off‑state Current: <0.25 mA
• Input On‑state Current: >5 mA
• Outputs: 2 isolated groups, 2 outputs each
• Output Supply Voltage Range: 10‑31V DC (12‑24V) / 5‑7V DC (5V)
• Output Current: 0.5A @ 5V DC / 1.0A @ 12‑24V DC
• FlexBus Current Draw: 75 mA @ 5V DC
• Power Dissipation: 5.0W @ 31.2V DC (max)
• Thermal Dissipation: 17.1 BTU/hr @ 31.2V DC (max)
• Isolation Voltage: 50V (basic insulation, tested at 850V DC for 1s)
• Dimensions: 94 x 94 x 69 mm (3.7 x 3.7 x 2.7 in) with module installed
• Operating Temperature: 0 °C to 55 °C (32 °F to 131 °F)
• Humidity: 5–95% non‑condensing

Installation & Compatible Bases

• Install the 1794-VHSC on a 1794-TB3G or 1794-TB3GS terminal base.
• Mount the base on a standard DIN rail or panel enclosure.
• Connect the module to the FlexBus via the terminal base interface.
• Use a 24V DC nominal external power supply (19.2‑31.2V DC range).
• The module draws 100 mA at 24V DC from the external supply.
• Set the key‑switch position correctly for proper module identification.

Input & Output Wiring Details

• Each input channel supports 2 groups with 3 inputs per group.
• Configure the module for 3 encoder modes using 5V or 15‑24V terminations.
• Input current: 19.1 mA @ 5V DC / 25.7 mA @ 6V DC (5V termination).
• Input current: 6.1 mA @ 15V DC / 10.2 mA @ 24V DC (15‑24V termination).
• Outputs are isolated in 2 groups for flexible load control.
• Output off‑state leakage current is less than 300 μA.
• Output voltage loss: 0.9V DC @ 0.5A (5V) / 0.9V DC @ 1.0A (12‑24V).

Environmental & Safety Ratings

• Isolation: 50V continuous (basic insulation, 850V DC test)
• Power Dissipation: 5.0W @ 31.2V DC (max)
• FlexBus Draw: 75 mA @ 5V DC
• Operating Temp: 0 °C to 55 °C (32 °F to 131 °F)
• Humidity: 5–95% non‑condensing
• Certifications: c‑UL‑us, CSA, CE compliant.

Package Contents

• 1 x 1794-VHSC Very High Speed Counter Module
• Installation instruction manual
• Key‑switch position label

Shipping & Logistics

• We ship via FedEx, UPS, or DHL – fast and fully trackable.
• Orders dispatch within 5 business days from our warehouse.
• We keep ample stock of the 1794-VHSC – no backorder delays.
• 30‑day return policy – simple and customer‑friendly.

Frequently Asked Questions (FAQ)

• Q: Is the 1794-VHSC a genuine Allen‑Bradley product?
  Yes, we supply 100% original, brand‑new units direct from Rockwell Automation.
• Q: What terminal bases work with the 1794-VHSC?
  It mounts on the 1794-TB3G or 1794-TB3GS terminal base units.
• Q: What is the maximum input frequency?
  The module supports input frequencies up to 1 MHz (counter‑dependent).
• Q: What is the input voltage range?
  It accepts 5V DC or 15‑24V DC depending on the termination used.
• Q: How many outputs does the 1794-VHSC provide?
  It provides 2 isolated groups with 2 outputs per group (total 4 outputs).
• Q: How quickly do you ship orders?
  We ship within 5 days via FedEx, UPS, or DHL – delivery varies by region.
• Q: What is the operating temperature range?
  The module operates from 0 °C to 55 °C (32 °F to 131 °F).

Contact Information

• For inquiries, please email sales@nex-auto.com or call +86 153 9242 9628.
• Partner: NexAuto Technology Limited