What it means
F01023 is raised when an internal software timeout has occurred — a timeout inside the software of the Control Unit (CU). The drive does not trigger a dedicated automatic response to this fault; instead, the message must be acknowledged immediately. The fault value that accompanies the code has no user-facing meaning: the manuals reserve it for internal Siemens troubleshooting.
Why it appears
- An internal software timeout has occurred in the Control Unit (CU) — this is the only cause the manuals name, and they name it identically for every family that describes the code.
What to check
- Carry out a POWER ON: switch all components off and then on again.
- Upgrade the firmware to a later version.
- Contact Technical Support.
Reading the message value
- The drive stores the fault value belonging to this code in r0949; the manual says to interpret the value in decimal.
- There the explanation ends: the fault value is only for internal Siemens troubleshooting, and no decoding for the user is given.
Parameters the manual names
- r0949 — fault value: for this code the value is read in decimal, but it is only for internal Siemens troubleshooting and has no meaning for your own diagnosis.
Acknowledging and restarting
The fault must be acknowledged immediately. The restart is built into the remedy: the first step is a POWER ON — switching all components off and back on again. The remaining remedy steps are upgrading the firmware to a later version and contacting Technical Support.
What differs between the drive families
Straight from the manuals' own fields — F01023 is not described identically everywhere.
| Drive family | Reaction | Acknowledge | Message class | Component | Manual |
|---|---|---|---|---|---|
| G130, G150 | NONE | IMMEDIATELY | Hardware/software error (1) | Control Unit (CU) | SINAMICS G130, G150 List Manual · p. 1375 |
| S120, S150 | NONE | IMMEDIATELY | Hardware/software error (1) | Control Unit (CU) | SINAMICS S120, S150 List Manual · p. 2561 |
| G120 | NONE | IMMEDIATELY | Hardware/software error (1) | — | SINAMICS G120 · p. 823 |
| G120XA | NONE | IMMEDIATELY | — | — | SINAMICS G120XA PN converter · p. 1100 |
The drives this code lives on
F01023 is described for G120, G120XA, G130, G150, S120, S150. These are the converters of those families in our catalogue — price on request.
Questions technicians ask
What does fault F01023 (Software timeout internal) mean on a SINAMICS drive?
The Control Unit (CU) reports that an internal software timeout has occurred, i.e. a fault raised inside the drive's own control software. The drive takes no automatic response to it, but the fault must be acknowledged immediately.
How do I clear F01023 and restart the drive?
Carry out a POWER ON (switch-off/switch-on) for all components — this is both the first remedy step and the restart. The manual's further steps are upgrading the firmware to a later version and contacting Technical Support.
What is the fault value of F01023 in r0949 telling me?
The value is stored in r0949 and is to be read in decimal, but the manuals state that it is only for internal Siemens troubleshooting — there is no decoding for the user.
Does F01023 shut the SINAMICS drive down?
No automatic reaction is assigned to this fault, so the drive does not trip because of it. It still has to be acknowledged immediately, and the remedy starts with a POWER ON of all components.
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 F01xxx group · SINAMICS manuals · Siemens manuals