Cause : External alarm 1 comes when the drive detected an unexpected signal on the designated digital input terminal for external alarm 1.

The A015 alarm in siemens master drive indicates an issue with external alarm input 1. This alarm is triggered when the drive detects an unexpected state on the designated digital input terminal.

1. Check whether the cable to the appropriate binary input is interrupted.
2. Check parameter P588 S alarm ext. 1.