What it means
The Control Unit (CU) raises alarm A01100 — titled “CU: Memory card withdrawn” — when the memory card, which forms the drive's non-volatile memory, is pulled out of the Control Unit while the drive system is in operation. The manual attaches an explicit warning to this message: It is not permissible for the memory card to be withdrawn or inserted under voltage.
The alarm only signals the condition; the drive does not trip, and no acknowledgment is needed — the message is resolved by putting the card back correctly.
Why it appears
- The memory card (non-volatile memory) was withdrawn from the Control Unit while the drive system was in operation.
What to check
- Switch the drive system off.
- Re-insert the memory card that was withdrawn; it must be the card that matches this drive system.
- Switch the drive system on again.
Acknowledging and restarting
No acknowledgment is required for this alarm. The condition is remedied by switching the drive system off, re-inserting the matching memory card and switching the drive system on again — always with the system off, since the card must not be withdrawn or inserted under voltage.
The same on every family
Every manual that describes A01100 gives it the same reaction, acknowledgement and message class.
| Drive family | Reaction | Acknowledge | Message class | Component | Manual |
|---|---|---|---|---|---|
| S120, S150 | NONE | NONE | General drive fault (19) | Control Unit (CU) | SINAMICS S120, S150 List Manual · p. 2577 |
| G130, G150 | NONE | NONE | General drive fault (19) | Control Unit (CU) | SINAMICS G130, G150 List Manual · p. 1390 |
The drives this code lives on
A01100 is described for G130, G150, S120, S150. These are the converters of those families in our catalogue — price on request.
Questions technicians ask
What does alarm A01100 mean on a SINAMICS drive?
The Control Unit has detected that the memory card — the drive's non-volatile memory — was withdrawn while the drive system was in operation.
Can I remove or insert the memory card while the drive is powered up?
No. The manual states explicitly that it is not permissible for the memory card to be withdrawn or inserted under voltage.
Does A01100 stop the drive?
No automatic reaction is triggered; the alarm only signals that the memory card was withdrawn during operation.
How do I clear alarm A01100?
Switch off the drive system, re-insert the withdrawn memory card — it must match the drive system — and switch the drive system on again. No acknowledgment is needed.
Codes next to this one
Source
Written from Siemens' own List Manuals and operating instructions; every number, designation and parameter on this page is checked against them before publication.
All SINAMICS codes: fault and alarm codes · the A01xxx group · SINAMICS manuals · Siemens manuals