4642

Address IO input structure

Beckhoff · TwinCAT 2 NC

What does 4642 mean?

The drive lacks a valid I/O input address in the process image. This indicates a mapping error where the NC system cannot correctly read input data (e.g., encoder feedback, limit switch status) from the drive because its process image address is either missing or invalid. This will lead to a lack of critical feedback for control.

Complete Troubleshooting Guide

  1. 1

    Review the I/O mapping configuration for the drive's input structure in the NC system.

  2. 2

    Ensure the correct and valid address is assigned in the process image for all required inputs.

  3. 3

    Check for consistency between the hardware's physical I/O and the software's process image mapping.

  4. 4

    Save configuration changes and restart the NC system.