What it means
A07479 is an alarm of the EPOS positioning function: the axis is standing at the position of the software limit switch minus, and the traversing block that was active has been interrupted as a result. The alarm carries no message value, so there is no additional information to decode.
Why it appears
- The axis is at the position of the software limit switch minus.
- Because the limit was reached, the traversing block that was active was interrupted.
What to check
- Correct the target position so that the traversing motion no longer ends at the software limit switch minus.
- If the minus limit itself should sit elsewhere, change the software limit switch minus — the manual names p2578 (CI: the signal source of the limit) and p2580 (CO: the limit value) for this.
Parameters the manual names
- p2578 (CI: EPOS software limit switch minus signal source) — selects the signal source from which the drive takes the software limit switch minus; one of the two parameters named for changing the minus limit.
- p2580 (CO: EPOS software limit switch minus) — the software limit switch minus value itself; change it here to move the minus limit.
- p2582 (BI: EPOS software limit switch activation) — the binector input that activates the software limit switch function; the manual lists it alongside the two limit parameters for this alarm.
Acknowledging and restarting
This alarm requires no acknowledgement. Once the cause is removed — the target position corrected, or the software limit switch minus changed via p2578 and p2580 — the interrupted traversing block can be started again.
The same on every family
Every manual that describes A07479 gives it the same reaction, acknowledgement and message class.
| Drive family | Reaction | Acknowledge | Message class | Component | Manual |
|---|---|---|---|---|---|
| S120, S150 | NONE | NONE | Application/technological function faulted (17) | None | SINAMICS S120, S150 List Manual · p. 2826 |
| G130, G150 | NONE | NONE | Application/technological function faulted (17) | None | SINAMICS G130, G150 List Manual · p. 1563 |
The drives this code lives on
A07479 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 A07479 mean in SINAMICS?
It reports that the axis has reached the position of the software limit switch minus in the EPOS positioning function, and that the traversing block which was active has been interrupted.
How do I clear A07479?
Correct the target position, or change the software limit switch minus via p2578 and p2580. The alarm requires no acknowledgement.
Does A07479 stop the drive?
No automatic reaction is configured. Only the active traversing block is interrupted; after correcting the target position or the limit, traversing can be started again.
Which parameters set the EPOS software limit switch minus?
p2578 selects the signal source of the minus limit, p2580 holds the limit value, and p2582 activates the software limit switch function.
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 A07xxx group · SINAMICS manuals · Siemens manuals