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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