NU-DN1 Keyence Network Communication Unit – DeviceNet for N-Bus Sensor Amplifiers
The NU-DN1 is a network communication unit from the NU series. It links N-bus sensor amplifiers to a DeviceNet network. The unit supports I/O polling and explicit messages. Node addresses run from 0 to 63. Baud rate auto-selects at 500 / 250 / 125 kbps. Max cable length depends on speed: 100 m at 500 k, 250 m at 250 k, and 500 m at 125 k. It connects up to 16 N-bus amplifiers. Total passing current must stay at 1,200 mA or less. Power comes from the DeviceNet supply at 11 to 25 VDC. The NU-DN1 is active and in production as of 2026-09.
Network and Node Data
- Model: NU-DN1
- Brand: Keyence
- Series: NU
- Protocol: DeviceNet
- Messages: I/O polling plus explicit message
- Address range: 0 to 63
- Baud rate: Auto 500 / 250 / 125 kbps
Cable Length Limits
- 500 kbps: 100 m maximum
- 250 kbps: 250 m maximum (thick cable)
- 125 kbps: 500 m maximum (thick cable)
Sensor Connection
- N-bus amplifiers: Up to 16 units
- Passing current: 1,200 mA or less total
- Wiring: Wiring-saving connector
- Connection type: N-bus sensor amplifier link
Power and Physical
- Supply voltage: 11 to 25 VDC (from DeviceNet power supply)
- Power consumption: 1,480 mW or less
- Current draw: 60 mA max at 24 V (excluding sensor current)
- Weight: Approx. 0.065 kg including connectors
- Built-in port: DeviceNet 5-pin
- Communication expansion: None
Environment
- Operating temperature: -20 to +55 °C (no freezing)
- Relative humidity: 35 to 85% RH (no condensation)
- Storage temperature: Not available
- Protection rating: Not available
Oiltech Controls Review
The NU-DN1 solves a common plant problem. It brings N-bus sensor data onto DeviceNet without a full PLC rack. Up to 16 amplifiers share one node. This cuts wiring time and cabinet space. The auto baud rate simplifies setup. Addresses 0 to 63 give plenty of room on most networks. The 5-pin DeviceNet port is standard. Watch the 1,200 mA passing current limit. Add up your amplifier currents before wiring. The 11 to 25 VDC range comes from the DeviceNet trunk. This unit has no extra communication expansion. It is a clean bridge between Keyence sensor networks and DeviceNet masters. Engineers upgrading old DeviceNet lines will find it useful.
Oiltech Controls’s Insight
- Add all amplifier currents to stay under 1,200 mA.
- Use thick cable for runs over 100 m.
- Set the node address before power-up.
- Keep trunk terminators at both ends.
- Check DeviceNet supply voltage at the far node.
- Label each N-bus amplifier for faster service.
Compatible Equipment
- Keyence N-bus compatible sensor amplifiers
- DeviceNet masters and scanners
- DeviceNet 5-pin trunk and drop cables
- Legacy DeviceNet control systems
- Packaging, assembly, and inspection cells
- Plants migrating sensor data to DeviceNet
Why Buy From Oiltech Controls?
- More than 15 years in industrial automation spare parts.
- Global shipment support with FedEx, UPS, and DHL.
- Tested industrial surplus and refurbished options.
- 12-month warranty on every order.
- Technical verification before shipment.
- Support for obsolete control systems.
- Orders dispatch in 24 to 28 hours.
Contact us at info@oiltechcontrols.com or +86 158 8020 0923 on WhatsApp.
FAQ
Q: How many sensor amplifiers can the NU-DN1 handle?
A: Up to 16 N-bus amplifiers. Keep total passing current at 1,200 mA or less. Add the current of each amplifier before wiring. Exceeding the limit causes faults.
Q: Does the NU-DN1 need a separate power supply?
A: No. It draws power from the DeviceNet trunk. The range is 11 to 25 VDC. Check voltage at the far end of long cables. Low voltage causes node dropouts.
Q: What cable length can I use at 500 kbps?
A: 100 m maximum at 500 kbps. Use 250 m at 250 kbps with thick cable. Use 500 m at 125 kbps with thick cable. Match baud rate to cable length for stable data.
Q: Can I mix N-bus amplifier types on one NU-DN1?
A: Yes, if they are N-bus compatible. The unit reads them as a group. Check each amplifier’s current draw. Keep the total under 1,200 mA.
Q: How do I choose between NU-DN1 and a full PLC?
A: Pick NU-DN1 for sensor-only data on DeviceNet. Pick a PLC if you need logic, motion, or more I/O. The NU-DN1 has no expansion port. It is a focused network bridge.
SEO and Ordering Notes
- Warranty: 12 months from Oiltech Controls.
- Dispatch: 24 to 28 hours after order.
- Shipping: FedEx, UPS, DHL.
- Stock: New, surplus, and refurbished options.
- Support: Obsolete control systems welcome.
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