A7479 alarm in siemens sinamics V90 drive indicates the EPOS Software limit switch minus was reached. This means the axis successfully stopped at the negative software boundary, interrupting its active traversing block.
Cause: The axis is at the position of the software limit switch minus. An active traversing block was interrupted.
Remedy:
- Correct the target position.
- Change software limit switch minus (CI: p2580).
