Allen-Bradley 1794-VHSC
Allen-Bradley 1794-VHSC
Allen-Bradley 1794-VHSC
Allen-Bradley 1794-VHSC
Allen-Bradley 1794-VHSC
Allen-Bradley 1794-VHSC
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1794-VHSC

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The 1794-VHSC maintains a Flexbus current consumption of 75mA at 5V DC and dissipates 5W of heat at maximum voltage of 31.2V DC.
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Technical specifications for 1794-VHSC

  • Manufacturer:
    Allen-Bradley
  • Part Number:
    1794-VHSC
  • Product Family:
    Flex I/O
  • Input Channels:
    2
  • Inputs per Counter:
    2 Groups of 3
  • Input Voltage:
    5V DC
  • Input Off-state Voltage:
    <1.8V DC
  • Input Off-state Current:
    <0.25 mA
  • Input On-state Current:
    >5mA
  • Outputs:
    2 Isolated Groups of 2
  • Output Supply Voltage Range:
    10-31V DC
  • Power Dissipation:
    5.0W @ 31.2V DC max.
  • Thermal Dissipation:
    17.1 BTU/hr. @ 31.2V DC max.
  • Weight:
    0.12 kg
  • Estimated shipping dimensions:
    9.2x5.3x4.5cm
  • Tariff Code:
    8537101190
  • Country of origin:
    USA
  • Place of shipment:
    Xiamen,Fujian,China
By purchasing this item, you agree to the Terms & Conditions, ApterPower is not an authorized distributor for listed manufacturers or tradenames and therefore the manufacturer's warranty does not apply. All our products come with ApterPower's 1-year warranty.

More Information

Overview Manuals Specifications Applications Temperature & Humidity Range Firmware & Updates

Features:

  • Bridge Between High-Speed Field Signals and Flex I/O Backplane
  • Integrates Dual-Channel Counter Functionality with Flexible Voltage Support
  • Functions Alongside All EtherNet-Compatible Programmable Controllers
The Allen-Bradley 1794-VHSC serves as the High-Speed Counter module in a Flex I/O rack, delivering precise counting capabilities for most industrial applications. It continuously processes incoming pulse signals from encoders and sensors at frequencies up to 1MHz and transmits processed data through the rack backplane to all compatible programmable controllers with EtherNet capability. The 1794-VHSC supports 2 input channels with 2 counters per channel, configurable for 3 encoder modes using either 5V DC or 15-24V DC terminations. Seamless integration is standard with the 1794-VHSC, and its isolated outputs provide reliable switching for external devices in automated control systems.

The 1794-VHSC provides essential counting functions critical to motion control and position monitoring applications, directly affecting the accuracy and responsiveness of industrial automation systems. One 1794-VHSC module occupies a single slot in the Flex I/O rack when installed on either the 1794-TB3G or 1794-TB3GS terminal base unit. The 1794-VHSC requires a 24V DC nominal external power supply with an operational range of 19.2-31.2V DC, drawing 100mA at 24V DC.

For applications requiring electrical isolation, the 1794-VHSC incorporates 50V isolation using basic insulation type between 6 isolated areas, tested at 850V DC for 1 second. In addition to standard counting operations, the 1794-VHSC provides 2 isolated outputs organized into 2 groups with electrical ratings of 0.5A at 5V DC and 1.0A at 12-24V DC. The 1794-VHSC output system maintains a leakage current of less than 300μA in the OFF state and a voltage loss of 0.9V DC at rated current. Using this architecture, the 1794-VHSC continually monitors incoming pulse streams and maintains accurate count values. If the system detects signal transitions within the configured voltage thresholds, it will automatically update counter registers and provide real-time feedback to the master controller via the Flexbus, which draws 75mA at 5V DC.

The 1794-VHSC Allen-Bradley Flex I/O High-Speed Counter module may still be available for purchase and support from Apter Power beyond End-Of-Life (EOL) by the manufacturer (OEM).
Allen-Bradley 1794-VHSC Flex I/O High-Speed Counter module Manuals,Datasheets,Link Important Notice: Other accessories, manuals, cables, calibration data, software, etc. are not included with this equipment unless listed in the above stock item description. All prices are shown in USD.
Allen-Bradley 1794-VHSC Flex I/O High-Speed Counter module Specs

General

  • Manufacturer Allen-Bradley
  • Model 1794-VHSC
  • Condition New Original ready stock
  • Product Family 1734-VHSC24,1734-VHSC5,1794-TB3G
Important Notice: Other accessories, manuals, cables, calibration data, software, etc. are not included with this equipment unless listed in the above stock item description. All prices are shown in USD.
  • High-Speed Sorting & Packaging: Essential in bottling and packaging facilities where rapid counts must be maintained during high-speed operations.
  • Cut-to-Length & Labeling: Utilizes onboard outputs to trigger sub-millisecond hardware-level responses, bypassing network latency for critical accuracy.
  • Motion Control: Interfaces with differential or single-ended encoders for precise tracking of motor or conveyor positions.
  • Measurement: Supports modes for measuring period, rate, and frequency up to 1 MHz.
  • Operating Temperature (Standard): 0 to 55 °C (32 to 131 °F).
  • Operating Temperature (XT Version): -20 to 70 °C (-4 to 158 °F).
  • Storage Temperature: -40 to 85 °C (-40 to 185 °F).
  • Relative Humidity: 5% to 95% (non-condensing).
  • Verification: Firmware revisions can be checked via the physical module label or through RSLinx software.
  • Downloads: Updates and flash files are available through the Rockwell Automation PCDC (Product Compatibility and Download Center).
  • Configuration: Integration with Logix controllers is managed through the Add-On Profile (AOP) or generic module profiles in Studio 5000.
Description
The Allen-Bradley 1794-VHSC is an intelligent Flex I/O High-Speed Counter module specifically engineered for precision counting and position control applications in industrial automation environments. This 1794-VHSC module is designed to perform high-speed counting operations across a wide spectrum of industrial processes, delivering accurate signal processing to all compatible programmable controllers equipped with EtherNet capability. The 1794-VHSC features 2 input channels, with each channel supporting 2 counters, and can be configured for 3 distinct encoder modes using either 5V DC or 15-24V DC terminations. This versatile configuration makes the 1794-VHSC ideal for motion control systems, conveyor belt monitoring, and rotary encoder feedback applications where precise position tracking is critical.

 The module maintains strict OFF-state voltage thresholds of less than 1.25V DC for 5V DC termination and less than 1.8V DC for 15-24V DC termination, ensuring reliable signal discrimination in noisy industrial environments. The 1794-VHSC supports counter-dependent input OFF-state and ON-state ratings and achieves an impressive input frequency capability of up to 1MHz, making it perfectly suited for high-speed packaging machinery, material handling systems, and precision measurement applications where rapid pulse counting is essential.

The 1794-VHSC is equipped with 2 isolated outputs organized into 2 groups, featuring electrical ratings of 0.5A at 5V DC and 1.0A at 12-24V DC. The output supply voltage range for the 1794-VHSC spans 5-7V DC and 10-31V DC, with a minimal leakage current of less than 300μA in the OFF state. The 1794-VHSC demonstrates efficient power handling with a voltage loss of 0.9V DC at 0.5A when using 5V DC termination, and 0.9V DC at 1.0A with 12-24V DC termination. This robust output capability enables the 1794-VHSC to directly drive external devices such as solenoids, relays, and indicator lights in automated manufacturing cells and process control systems.

The module requires a 24V DC nominal external power supply with an operational range of 19.2-31.2V DC, drawing a current of 100mA at 24V DC. The 1794-VHSC incorporates 1 key-switch position for secure configuration and provides 50V isolation using basic insulation type across 6 isolated areas, verified through testing at 850V DC for 1 second. This high isolation rating makes the 1794-VHSC particularly valuable in applications requiring electrical separation between control and field devices, such as in food and beverage processing or pharmaceutical manufacturing where safety and signal integrity are paramount.
Revisions

Revision Part #

Also known as

1794-VHSC Ser A
1794-VHSC/A, Series A, Rev A
Alternative Names
1794 VHSC 1734-VHSC24 1734-VHSC5 1794-TB3G 1794-TB3GS
Technical notes
The 1794-VHSC offers flexible input ratings of 5V DC or 15-24V DC, determined by the selected terminal base termination type. When utilizing 5V DC termination, the 1794-VHSC draws an input current of 19.1mA at 5V DC and 25.7mA at 6V DC. Alternatively, with 15-24V DC termination, the 1794-VHSC operates with an input current of 6.1mA at 15V DC and 10.2mA at 24V DC.
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FAQS

The following is a list of questions commonly asked by our customers. Please contact us if you have a question about our process that is not answered below.
How does the 1794-VHSC handle high-speed signal processing?
The 1794-VHSC is capable of processing input frequencies up to 1 MHz, allowing it to accurately capture rapid pulse signals. This makes it ideal for applications like packaging machinery, conveyor systems, and precision measurement where high-speed counting is critical.
How does the 1794-VHSC ensure electrical safety and signal integrity?
The module provides 50V isolation across multiple areas and is tested at 850V DC for durability. This isolation protects control systems from electrical noise and interference, ensuring stable operation in demanding industrial environments.
What are the installation and power requirements for the 1794-VHSC?
The 1794-VHSC is installed on compatible terminal base units such as 1794-TB3G or 1794-TB3GS. It requires a 24V DC external power supply with an operating range of 19.2–31.2V DC and consumes approximately 100 mA at 24V DC.

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