Product Summary
The 1794-ADN DeviceNet adapter connects a Flex I/O rack to a central DeviceNet scanner. This module supports up to eight I/O modules and three selectable communication rates. It operates on a 24 VDC supply and provides a 5V FlexBus output of 640 mA. The unit mounts on a DIN rail or directly to a panel.
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Understanding the Core Role of the 1794-ADN
The 1794-ADN acts as the communication gateway for your Flex I/O system. It exchanges I/O data between the rack and a DeviceNet scanner. This module handles data at speeds of 125, 250, or 500 Kbps. You must select the correct baud rate for your network. The module detects the baud rate automatically during power-up. This feature simplifies initial setup and integration.
Critical Power Supply Requirements
Your system needs a 24 VDC power supply for the 1794-ADN. The supply must provide 400 mA at the nominal voltage. The input voltage range is from 19.2 to 31.2 Volts DC. The power supply must also handle a turn-on inrush surge current of 14A for 5 ms. Plan your power budget to include these requirements. The module draws 90 mA from the DeviceNet power itself.
Selecting the Correct Cabling
The manufacturer specifies a specific cable for this module. Use Belden YR-29832 or an equivalent third-party cable. The maximum wire size is 12 gauge stranded with a 1.2mm insulation. Use Category 1 wire for the power ports. Use Category 2 wire for the communication ports. Proper cabling ensures reliable network communication and reduces noise.
Module Configuration and Addressing
You must set a unique node address for the 1794-ADN on your network. Use the built-in thumbwheel switches to set the address. Valid address settings range from 00 to 63. Use the minus (-) and plus (+) buttons to adjust the value. This manual configuration prevents address conflicts on the DeviceNet network. Always power down the module before changing the address.
Mechanical Mounting Options
The 1794-ADN supports two standard mounting methods for industrial cabinets. You can mount it on a standard DIN rail for quick installation. You can also mount it directly to a panel using screws. The module is the leftmost component in the Flex I/O rack. Its compact size measures just 3.7 x 3.6 x 3.4 inches. This small footprint saves valuable space inside your control panel.
Operational Status Monitoring
The front panel of the 1794-ADN includes two key status indicators. The Mod/Net status LED shows red or green for network health. The I/O status LED shows red or green for I/O module health. Use these LEDs to quickly diagnose communication problems. They help you identify if the issue is with the network or the I/O modules. This feature speeds up troubleshooting during system commissioning.
Logistics & Standard Packaging Details
- 1x Allen-Bradley 1794-ADN DeviceNet Adapter Module
- 1x 5-pin or 10-pin linear plug for the DeviceNet port
- Quick reference guide for installation
- Express delivery shipping available via FedEx, UPS, and DHL
