F071

DSI Net Loss

Allen-Bradley · PowerFlex 520-series Adjustable Frequency AC Drive

What does F071 mean?

Control over the Modbus or DSI communication link has been interrupted, meaning the drive has lost communication with its master controller via the DSI port. This prevents remote commands and monitoring, potentially causing the drive to fault or transition to a safe state based on its parameter settings.

Complete Troubleshooting Guide

  1. 1

    Cycle power to the drive to attempt to re-establish the DSI communication link.

  2. 2

    Check the communications cabling (RS-485, DSI) for physical integrity, proper connections, and absence of damage or interference.

  3. 3

    Verify the Modbus or DSI setting parameters in the drive (e.g., address, baud rate, parity) match the master device's configuration.

  4. 4

    Check the Modbus or DSI status from the master device or a diagnostic tool to confirm communication health.