Schneider 170NEF11021 Modbus Plus Adapter | Modicon Momentum I/O

Product Description

Overview

The Schneider Electric 170NEF11021 is a Modbus Plus communication adapter designed to interface Modicon Momentum I/O bases with Modbus Plus networks. Operating at 1 Mbit/s, it delivers deterministic, peer-to-peer communication between PLCs and I/O modules, ensuring fast and reliable data transfer in industrial settings.

Compact and robust, the adapter draws power directly from the connected I/O base, reducing installation complexity and supporting multidrop network topologies of up to 31 devices per segment, or 63 devices across the full network using repeaters.

Technical Specifications

Key Features

Plug-and-Play Integration: Attaches directly to Momentum I/O bases to provide immediate network connectivity without additional wiring.
Deterministic Communication: Token Bus protocol prevents data collisions, maintaining precise timing for control loops.
LED Diagnostics: Three front-panel LEDs indicate network activity, power, and error status for simplified troubleshooting.
Legacy System Support: Compatible with older Modicon platforms while enabling integration with hybrid modern systems.
Configurable Fail-Safe Modes: Supports fallback to zero, last-value hold, or specific safety-defined outputs during network faults.

Applications

The 170NEF11021 is used in:

• Distributed Control Systems: High-speed networking between multiple PLCs and I/O stations.

• Process Automation in Chemical Plants: Real-time communication across hazardous areas.

• Power Generation: Linking turbine controllers and monitoring systems.

• Manufacturing & Assembly Lines: Deterministic communication for synchronized operations.

• Legacy System Integration: Connecting older Modicon platforms to modern networks.

FAQ

Q: Which PLCs are supported?
A: Compatible with Modicon Momentum, Compact 984, and Quantum PLCs.

Q: How far can the network extend?
A: Up to 5000 meters with repeaters.

Q: How many devices can this adapter connect?
A: 31 per segment, or 63 across all segments using repeaters.

Q: What type of connector is used?
A: SUB-D 9-pin connector for Modbus Plus.

Q: Is it still in production?
A: As of 2022, it is largely discontinued in favor of Ethernet-based solutions but remains available for legacy systems.