Keyence NU-EN8N e-CON Input Unit

Keyence NU-EN8N e-CON Input Unit

Product Introduction

The NU-EN8N from Keyence extends an NU network communication unit with discrete input channels. This expansion unit provides 8 inputs through e-CON 4-pin connectors. It saves panel space because one compact module replaces eight separate terminal blocks. Furthermore, the unit draws its supply from the connected communication unit. Therefore, integrators can add sensor and switch inputs without extra power wiring.

Technical Specifications

The input section accepts NPN open-collector or contact signals. Response time is 20 µs or less, so short pulses from high-speed sensors are captured reliably. Input resistance is 2.4 kOhm. The minimum ON voltage is 6 V, and the maximum OFF current is 0.9 mA. In addition, total supply current for all eight ports stays at 520 mA or less.

Each channel uses an e-CON 4-pin connector, a standard format for quick sensor termination. The NU-EN8N also accepts up to 16 N-bus compatible sensor amplifiers through the wiring-saving connector. Moreover, the total passing current for the amplifier chain must remain at 1,200 mA or less.

Key Electrical Parameters

• Supply Voltage: 12 to 24 VDC ±10% (from connected communication unit)

• Input Type: NPN open-collector or contact

• Response Time: 20 µs or less

• Input Resistance: 2.4 kOhm

• Minimum ON Voltage: 6 V

• Maximum OFF Current: 0.9 mA

• Port Supply Current: 520 mA or less (8 ports)

I/O Configuration

• Inputs: 8 channels

• Connector: e-CON 4-pin × 8

• Sensor Link: N-bus, max 16 amplifiers, 1,200 mA or less

Mechanical and Environmental Parameters

The unit weighs approximately 0.055 kg including the tag. Its slim body mounts beside the communication unit inside the cabinet. Operating temperature ranges from -20 to +55 °C without freezing. Relative humidity must stay between 35 and 85% RH with no condensation. The NU-EN8N fits standard factory environments that use NU series networks.

Installation Guide

First, mount the NU-EN8N next to the NU communication unit on the DIN rail. Next, join the two units with the wiring-saving connector. Then, wire each sensor or switch to the e-CON 4-pin ports. After that, connect any N-bus sensor amplifiers to the expansion connector. Finally, power up the communication unit and confirm the input LEDs respond.

Keep the amplifier chain current below 1,200 mA and the port supply current below 520 mA. Additionally, check that each input signal reaches at least 6 V when ON. The unit receives 12 to 24 VDC from the communication unit; therefore, no separate supply is needed.

Packaging List

• NU-EN8N e-CON Input Unit × 1

• Operation Manual × 1

• End Unit × 2

FAQ

Q1: How many inputs does the NU-EN8N provide?
A: It provides 8 inputs through e-CON 4-pin connectors. Each port accepts one NPN open-collector or contact signal.

Q2: What response speed can I expect?
A: Response time is 20 µs or less. This speed suits high-speed sensors and fast machine cycles.

Q3: Does the NU-EN8N need its own power supply?
A: No. It draws 12 to 24 VDC from the connected NU communication unit. Only the communication unit needs a supply connection.

Q4: Can I still connect sensor amplifiers to this unit?
A: Yes. It accepts up to 16 N-bus compatible sensor amplifiers with a total passing current of 1,200 mA or less.

Q5: How is the unit shipped?
A: We ship via Fedex, UPS, and DHL. Transit times typically range from 3 to 7 business days depending on destination.