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Description
The 1784-U2DN is an Allen-Bradley (Rockwell Automation) USB-to-DeviceNet communication adapter that connects a standard PC or laptop USB port directly to a DeviceNet network, allowing engineers and technicians to configure, monitor, and troubleshoot DeviceNet nodes using RSLinx Classic and RSNetWorx for DeviceNet. It comes complete with a USB Type-A-to-Type-B cable and a DeviceNet connection cable terminated in an open-style 5-pin Phoenix (COMBICON) male connector, and serves as the modern, compact replacement for legacy ISA/PCI cards such as the 1784-PCD and the 1770-KFD serial interface.
Application Scenarios
Picture a field service engineer arriving at a food-processing line where a PowerFlex 70 drive on the DeviceNet network has stopped responding and needs its EDS file re-linked, parameter set downloaded, and node address verified before production resumes. The control panel has no spare serial or PCI slot PC—only a laptop with USB ports. The technician clips the 1784-U2DN inline: one end plugs into the laptop’s USB port via the included cable, the other connects to the DeviceNet trunk’s CAN-High/CAN-Low/V+ via the 5-pin open-style Phoenix connector (drawing 24 V DC from the network). Rotary DIP switches set the adapter’s node address (typically 63 or 00 for commissioning), and RSLinx auto-detects the “1784-U2DN” driver. Within minutes, RSNetWorx browses the network, identifies the faulty drive, uploads its configuration, and pushes the corrected parameter file—all without disturbing the running PLC scanner or opening the main control program. The 1784-U2DN solves the classic field pain point: quickly accessing and modifying a DeviceNet subnet from a modern Windows laptop when legacy ISA/PCI/serial interfaces are long obsolete.
Parameter
| Main Parameters | Value / Description |
|---|---|
| Product Model | 1784-U2DN (includes USB cable & DeviceNet pigtail cable) |
| Manufacturer | Allen-Bradley (Rockwell Automation) |
| Product Category | USB-to-DeviceNet Communication Adapter / PC Interface Cable |
| Host Interface | USB 2.0 Full-Speed Type-B (cable: Type-A to Type-B included), bus-powered |
| DeviceNet Port | 1 × 5-pin open-style Phoenix male connector (CAN-H, CAN-L, V+, Shield, DGND) |
| DeviceNet Baud Rates | Selectable via DIP switch: 125 kbps / 250 kbps / 500 kbps (auto-detect on power-up) |
| Node Address | Set via dual rotary DIP switches (0–63 decimal); factory default typically 63 |
| USB Bus Current Draw | 75 mA typical @ 5 V DC (powered from PC USB port) |
| DeviceNet Current Draw | 70 mA typical @ 24 V DC (drawn from DeviceNet V+ supply on network) |
| Isolation Voltage | 500 V AC tested for 60 s; basic insulation, DeviceNet side to USB side |
| Status Indicators | 3 LEDs — PWR (power), NET (DeviceNet activity), USB (host communication active) |
| Operating Temp / Humidity | 0 °C to +55 °C (32–131 °F); 5–95% RH non-condensing (IEC 60068-2) |
| Enclosure / Weight | IP20 rated plastic housing; approx. 170 g (including attached cables) |
| Compatible Software | RSLinx Classic v2.51+, RSNetWorx for DeviceNet v8.0+, RSLinx Enterprise |
| Certifications | cULus Listed, CE (EN 61326-1), KC, ODVA DeviceNet Conformance |
Technical Principles and Innovative Values
- Innovation Point 1 – True Plug-and-Play USB Bus-Powered Operation: The 1784-U2DN requires no external power supply for the USB-side circuitry—it is fully powered from the host PC’s USB port. The DeviceNet side draws its operating current from the network’s 24 V DC supply (V+ pin on the 5-pin connector). This eliminates the need for a separate wall adapter in the field, making the 1784-U2DN a truly portable diagnostic tool that fits in a technician’s laptop bag.
- Innovation Point 2 – Direct DeviceNet Scanner Emulation via RSLinx Driver: Once the RSLinx “1784-U2DN” driver is selected and the node address/baud rate match the network, the adapter presents itself as a DeviceNet scanner to RSNetWorx for DeviceNet. This allows full upload/download of scanner (e.g., 1747-SDN, 1769-SDN, 1756-DNB) configurations, explicit message testing to any node, EDS file association, and live I/O data table viewing—capabilities that older passive sniffers cannot provide.
- Innovation Point 3 – Hardware DIP Switches for Node & Baud—No Software Re-Enumeration Needed: Both the MAC ID (node address 0–63) and the baud rate are set via physical rotary DIP switches on the adapter body. Changing the setting requires a simple power-cycle (unplug/replug USB), avoiding the need to enter configuration dialogs or reload drivers—a deliberate design choice that speeds field reconfiguration when moving between multiple DeviceNet segments with different baud rates.
- Innovation Point 4 – Legacy 1770-KFD / 1784-PCD Replacement with Enhanced OS Compatibility: The 1784-U2DN supersedes the obsolete 1770-KFD (RS-232 to DeviceNet) and discontinued 1784-PCD (ISA/PCI card), providing native USB connectivity compatible with modern Windows 10/11 laptops that lack serial or expansion slots. It is fully recognized by current RSLinx Classic versions and does not require third-party drivers, ensuring long-term serviceability of existing DeviceNet installations.
