Siemens alarm 101: Prewarning replace battery

What it means

Battery monitoring responded at the advance-warning threshold: voltage has fallen below the prewarning level but data retention still works. The work process is not interrupted - this is the last call to replace the backup battery (control switched ON) before alarm 1 data-loss territory is reached.

Likely causes

• Backup battery nearing end of life
• Long machine downtime aging the battery

Replacement parts

We supply the following units for this alarm — tested, warranty-backed:

• NCK CPU backup battery pack (replace control ON)

  battery · Common cause

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