Product Description
The Allen-Bradley 1794-ADN acts as a high-performance communication interface between a DeviceNet network and the FLEX I/O system. This module manages distributed data exchange by connecting a primary scanner or controller to as many as eight individual FLEX I/O modules, providing a scalable and cost-effective distributed I/O solution.
Technical Specifications
The 1794-ADN utilizes reliable solid-state electronics to maintain network integrity across various industrial baud rates.
| Attribute | Details |
| Manufacturer | Allen-Bradley / Rockwell Automation |
| Model Number | 1794-ADN |
| Module Type | DeviceNet Network Adapter |
| I/O Capacity | Supports up to 8 FLEX I/O Modules |
| Input Voltage | 24V DC Nominal (19.2–31.2V DC Range) |
| Communication Rates | 125 Kbps, 250 Kbps, 500 Kbps |
| FlexBus Output | 640 mA @ 5V DC |
| Node Addresses | 00–63 (via Integrated Thumbwheel Switches) |
| Operating Temp | -20°C to +70°C (-4°F to +158°F) |
| Dimensions | 87 x 94 x 69 mm (3.4 x 3.7 x 2.7 in) |
Engineering Advantages
- Flexible Network Scaling: The 1794-ADN enables engineers to mix and match various digital, analog, and specialty I/O modules on a single node, which simplifies system architecture.
- Automatic Baud Rate Detection: During the initial power-up sequence, the module automatically senses the network data rate, reducing commissioning time and preventing configuration errors.
- Simplified Hardware Addressing: Integrated hardware thumbwheel switches allow technicians to set the DeviceNet node address manually, ensuring the module retains its identity even during system-wide software resets.
- Compact DIN Rail Mounting: The space-efficient design fits standard 35mm DIN rails or panel mounts, making it ideal for high-density control cabinets where enclosure space is limited.
- Enhanced Visual Diagnostics: Onboard LED indicators provide real-time status for both the I/O backplane and the DeviceNet network, allowing for rapid onsite troubleshooting without specialized tools.
- 100% Brand New Condition: We supply only original, factory-sealed Allen-Bradley units. This ensures that every 1794-ADN adapter meets the highest standards for vibration resistance and electrical surge protection, essential for maintaining long-term industrial uptime.
FAQs
How many I/O modules can a single 1794-ADN adapter manage?
One 1794-ADN adapter supports a maximum of eight FLEX I/O modules. The modules attach to the adapter via terminal bases, forming a single functional node on the DeviceNet network.
Does this module require an external power supply?
Yes, the adapter requires a 24V DC external power source to operate the internal electronics and provide the necessary 5V DC FlexBus current to the attached I/O modules.
What cabling is recommended for the 1794-ADN?
Rockwell Automation recommends using shielded twisted-pair DeviceNet cable, such as Belden YR-29832, to ensure noise-free communication at higher baud rates (500 Kbps).
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