PLCs, Power Supplies & Others

The Schneider 170NEF11021 functions as a Modbus Plus communication adapter for the Modicon Momentum automation platform from Schneider Electric. This adapter enables a Momentum I/O base to become a node on a Modbus Plus network. We supply this communication module to support your existing Momentum installations. It provides robust data exchange in distributed industrial control systems.

Technical Specifications and Physical Characteristics

Understanding the exact specifications of the Schneider 170NEF11021 ensures proper integration into your Modicon Momentum system. This adapter mounts directly onto the Momentum I/O base for compact installation.

Communication Protocol and Network Architecture

The Schneider 170NEF11021 implements the Modbus Plus protocol for industrial network communication. Its token-passing architecture ensures deterministic data exchange.

• Communication Protocol: It uses Modbus Plus peer-to-peer token bus protocol. This provides reliable communication between industrial control devices.

• Access Method: The adapter employs token passing for network access control. Consequently, each node transmits only when holding the token.

• Transmission Rate: It communicates at 1 Mbit per second data rate. This speed suits most industrial automation applications.

• Data Format: The adapter supports 984 data format for Modbus Plus compatibility. This ensures seamless integration with Modicon processors.

• Network Role: It functions as a node on the Modbus Plus network. Therefore, it can exchange data with other nodes without a master.

Network Capacity and Topology Support

The Schneider 170NEF11021 supports flexible network configurations for various application requirements. Its multidrop topology accommodates up to 63 devices.

• Devices per Segment: You can connect up to 31 devices on a single network segment. This supports substantial I/O counts in local areas.

• Total Devices: The network supports up to 63 devices total across multiple segments. Therefore, you can build extensive distributed systems.

• Network Topology: It uses multidrop topology with extension or tap-off cables. This simplifies wiring compared to star configurations.

• Maximum Distance: The network reaches 5000 meters total with repeaters installed. Consequently, it suits large facility installations.

• Transmission Medium: It requires twisted pair cabling for network connections. This provides good noise immunity at moderate cost.

Connector Types and Redundancy Features

The Schneider 170NEF11021 includes dual SUB-D9 connectors for network redundancy. This feature enhances system reliability in critical applications.

• Connector Type: It provides two SUB-D9 female connectors for network cabling. These standard connectors simplify field wiring and troubleshooting.

• Redundancy: Dual connectors enable redundant network cable connections. Therefore, a single cable failure does not disrupt communication.

• Cable Connection: You connect twisted pair cables to the SUB-D9 connectors. Proper pinout ensures correct signal transmission.

• Termination: External termination resistors may required at network ends. Check Modbus Plus installation guidelines for proper termination.

• Tap-Off Cables: You can use tap-off cables for device connection to the trunk. This simplifies adding or removing devices from the network.

Status Indication and Diagnostics

The Schneider 170NEF11021 provides LED indicators for power and communication status. These visual indicators simplify troubleshooting and commissioning.

• Power LED: A green LED indicates that the adapter receives power from the I/O base. Therefore, you can verify power availability at a glance.

• Communication LED: Additional LEDs show network activity and node status. This provides immediate feedback during network operation.

• Diagnostic Value: Operators can quickly identify communication problems. Consequently, they reduce troubleshooting time during outages.

• Module Status: LEDs also indicate proper adapter initialization and operation. This confirms the module functions correctly after power-up.

• Network Activity: Flashing LEDs indicate data transmission and reception. Therefore, you can verify network communication visually.

Fail State Configuration Options

The Schneider 170NEF11021 offers multiple fail state options for outputs during communication loss. These choices ensure safe system behavior during network problems.

• Full Scale Value: You can configure outputs to go to full scale value. This suits applications requiring maximum output during communication loss.

• Maintain Last Value: Outputs can hold their last received value indefinitely. Therefore, processes continue with the last commanded settings.

• Fallback to Zero: You can set outputs to return to zero value. This provides safe shutdown during communication failures.

• Force to Zero: Outputs can forced directly to zero regardless of last value. This ensures immediate safe state in critical applications.

• Configuration Flexibility: You select the appropriate fail state for your application. This customization enhances system safety and reliability.

Environmental Specifications and Operating Conditions

The Schneider 170NEF11021 operates reliably across a wide range of environmental conditions. Its robust design suits demanding industrial automation applications.

• Operating Temperature: The module functions from 0 to 60 degrees Celsius. This range accommodates most industrial control cabinet environments.

• Storage Temperature: It withstands storage from -40 to 85 degrees Celsius. This tolerance ensures survival during shipping and warehouse storage.

• Humidity Rating: The module operates at 5% to 95% relative humidity without condensation. Therefore, it resists moisture-related failures.

• Vibration Resistance: It withstands standard industrial vibration levels during operation. This ensures reliable performance near rotating machinery.

• Shock Resistance: The module tolerates typical industrial shock during operation. This protects against damage during installation and maintenance.

System Integration and Applications

Integrating the Schneider 170NEF11021 into your Momentum system requires straightforward mounting. It connects Momentum I/O to Modbus Plus networks alongside other Schneider Electric components.

• I/O Base Compatibility: The adapter mounts directly on any Momentum I/O base. This creates a complete networked I/O node.

• Network Integration: It connects to Modbus Plus networks with other nodes. Therefore, it exchanges data with PLCs, drives, and HMIs.

• Peer-to-Peer Communication: The adapter supports direct peer-to-peer data exchange. This enables distributed control without a master PLC.

• Programming: You configure the adapter through Momentum programming software. This sets node address and communication parameters.

• Spare Parts: The Schneider 170NEF11021 remains available as a replacement part. We stock this module to support your ongoing maintenance needs.

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