Schneider 170NEF11021 Modbus Plus Communication Adapter

Overview

The Schneider 170NEF11021 is a Modbus Plus communication adapter designed for the Modicon Momentum automation platform. It enables a Momentum I/O base to become a node on a Modbus Plus network. The adapter supports peer-to-peer token bus communication at a transmission rate of 1 Mbit/s. It uses twisted pair cabling and supports a multidrop topology with extension or tap-off cables. Additionally, dual SUB-D 9 connectors provide network redundancy. LED indicators show power and communication status, ensuring reliable and clear diagnostics. This adapter guarantees robust data exchange in distributed industrial control systems.

Technical Specifications

• Product Type: Modbus Plus Communication Adapter

• Platform Compatibility: Modicon Momentum series

• Communication Protocol: Modbus Plus

• Access Method: Peer-to-peer token bus

• Transmission Rate: 1 Mbit/s

• Transmission Medium: Twisted pair

• Topology: Multidrop (extension or tap-off cable)

• Max Devices per Segment: 31

• Max Devices across Segments: 63

• Maximum Cable Distance: 5000 m with repeater

• Data Format: 984

• Fail State Options:

• Full scale value

• Maintain last value

• Fallback to zero

• Force to zero

• Power Supply: From I/O base

• Electrical Connections:

• 2 × SUB-D 9-pin connectors (for Modbus Plus and redundant network)

• Local Signaling LEDs:

• Green: Powered/communicating (MB+ ACT)

• Red: Communication error network A (ERR A)

• Red: Communication error network B (ERR B)

• Certifications: CE, UL, CSA

• Electrostatic Discharge Resistance: 4 kV (contact), 8 kV (air)

• EMC Immunity: 10 V/m (80–1000 MHz)

• Operating Temperature: 0°C to +60°C

• Storage Temperature: −40°C to +85°C

• Relative Humidity: 95% non-condensing

• Altitude Limit: ≤ 5000 m

• Dimensions: 5.8 cm (H) × 18 cm (W) × 25.9 cm (L)

• Weight: 193 g