Allen Bradley 1794-ASB2 Remote IO Adapter

The Allen Bradley 1794-ASB2 is a Remote I/O (RIO) adapter module designed for Flex I/O systems. It provides high-speed communication between distributed Flex I/O modules and a PLC-5, SLC 500, or other RIO-compatible controllers. The 1794-ASB2 enhances distributed control architectures by enabling remote I/O expansion in a flexible, space-efficient format.

Technical Specifications

  • Manufacturer: Allen-Bradley (Rockwell Automation)
  • Model: 1794-ASB2
  • Communication Protocol: Remote I/O (RIO)
  • Baud Rates: Selectable 57.6, 115.2, or 230.4 Kbps
  • Power Supply Input: 19.2-31.2V DC (24V nominal)
  • Maximum Flex I/O Modules: Supports up to 8 I/O modules per adapter
  • Supported I/O Chassis Sizes: 1/2, 1, and 1.5 Logical Racks
  • Status Indicators: LED diagnostics for communication and fault detection
  • Backplane Current Load: 640 mA at 5V DC
  • Maximum Power Dissipation: 5.4W
  • Mounting Type: DIN Rail or Panel Mount
  • Operating Temperature Range: 0°C to 55°C (32°F to 131°F)
  • Certifications: UL, CE, C-Tick, and Class I Div 2 Hazardous Locations Approval

Key Features

  • Supports high-speed communication for efficient remote I/O operation
  • Compact Flex I/O design reduces panel space and installation costs
  • Selectable baud rates (57.6, 115.2, 230.4 Kbps) for communication flexibility
  • Supports rack addressing (1/2, 1, 1.5 Logical Racks) for various system configurations
  • Diagnostic LEDs provide real-time status updates on communication and errors
  • DIN rail and panel mounting options for installation flexibility
  • Compatible with PLC-5, SLC 500, and other Remote I/O networks

Compatible Allen-Bradley Components

  • Allen-Bradley PLC-5 and SLC 500 controllers
  • Allen-Bradley Flex I/O modules (analog, digital, specialty I/O)
  • Flex I/O Power Supplies (1794-PS13, 1794-PS3)
  • Other Flex I/O adapters, such as 1794-ADN (DeviceNet) or 1794-AENT (EtherNet/IP)

Industry Applications

  • Process automation and distributed control systems
  • Manufacturing and assembly line automation
  • Material handling and conveyor systems
  • Power generation and utility automation
  • Oil and gas, chemical, and refining industries

Installation & Operational Notes

  • Ensure proper voltage input (24V DC nominal) to avoid power disruptions
  • Verify correct baud rate settings to match the remote I/O network speed
  • Mount securely on DIN rail or panel to prevent vibration-related failures
  • Use diagnostic LED indicators to troubleshoot communication issues
  • Configure addressing according to the required rack size for optimal performance

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