What it means
The manual titles this message EPOS: Traversing block> target position > software limit switch plus
. The EPOS function raises alarm A07470 when a traversing block contains an absolute target position that lies beyond the range the software limit switch plus allows. It is a parameterization alarm: the drive only reports the inconsistent traversing data and takes no action. Neighbouring traversing-block alarms (A07466 to A07474) are described on their own pages.
Why it appears
- The traversing block specifies an absolute target position that lies outside the range limited by the software limit switch plus.
What to check
- Read the alarm value in r2124 and interpret it as a decimal number: it is the number of the traversing block with the illegal target position.
- Correct that traversing block so that its absolute target position lies within the range limited by the software limit switch plus.
- If the target position itself is intended, change the software limit switch plus (CI: p2579, p2581) instead.
Reading the message value
- The drive stores the alarm value in r2124, to be interpreted as a decimal number.
- The value is the number of the traversing block whose target position is illegal.
Parameters the manual names
- r2124 — alarm value: read it as a decimal number to get the number of the traversing block with the illegal target position.
- p2579 — CI: EPOS software limit switch plus signal source: change it here when the software limit switch plus has to be moved for this alarm.
- p2581 — CO: EPOS software limit switch plus: the limit itself; change it when the traversing block's target position is to remain valid.
Acknowledging and restarting
No acknowledgement is required and the drive takes no protective action — the alarm only flags the parameterization. Correct the traversing block or change the software limit switch plus (CI: p2579, p2581) so that the absolute target position lies within the allowed range.
The same on every family
Every manual that describes A07470 gives it the same reaction, acknowledgement and message class.
| Drive family | Reaction | Acknowledge | Message class | Component | Manual |
|---|---|---|---|---|---|
| S120, S150 | NONE | NONE | Error in the parameterization / configuration / commissioning procedure (18) | None | SINAMICS S120, S150 List Manual · p. 2824 |
| G130, G150 | NONE | NONE | Error in the parameterization / configuration / commissioning procedure (18) | None | SINAMICS G130, G150 List Manual · p. 1561 |
The drives this code lives on
A07470 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 SINAMICS alarm A07470 mean?
It is an EPOS alarm telling you that the absolute target position stored in a traversing block lies outside the range limited by the software limit switch plus.
How do I find the traversing block behind A07470?
Read the alarm value in r2124 as a decimal number. It is the number of the traversing block with the illegal target position.
How do I clear A07470?
Correct the traversing block, or change the software limit switch plus (CI: p2579, p2581) if the target position is intended. No acknowledgement is needed because the alarm triggers no drive reaction.
Does A07470 stop the drive?
No. The drive takes no action; the alarm only reports a parameterization error in the traversing block.
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