What it means
A08759 is a CAN alarm with the title CAN: PDO COB-ID already available
. It is raised when an already existing PDO COB-ID is allocated — in other words, a COB-ID that is already in use has been assigned again. The alarm points to the parameter in which this happened: the alarm value in r2124, read as a decimal number, is the parameter number. The manuals give a single remedy: select another PDO COB-ID.
Why it appears
- An already existing PDO COB-ID was allocated, i.e. a COB-ID that is already in use was assigned again.
What to check
- Read the alarm value in r2124 as a decimal number — it contains the number of the parameter in which the already existing PDO COB-ID was allocated.
- The COB-ID concerned is included in index 0 of that parameter, so this is where the duplicate identifier sits.
- Select another PDO COB-ID, i.e. enter a COB-ID that is not already allocated.
Reading the message value
- The alarm value is stored in r2124 and is interpreted as a decimal number; it contains the parameter number.
- The message value is output as
Parameter: %1
; the placeholder stands for the number of the affected parameter. - The manual notes that the COB-ID is included in index 0.
Parameters the manual names
- r2124 — alarm value: for this alarm it is interpreted as a decimal number and contains the number of the parameter in which the already existing PDO COB-ID was allocated.
Acknowledging and restarting
No acknowledgment is required for this alarm. The drive triggers no reaction to it and the message does not have to be acknowledged; selecting a PDO COB-ID that is not already in use is the whole remedy, and no reset step is needed beyond that.
What differs between the drive families
Straight from the manuals' own fields — A08759 is not described identically everywhere.
| 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. 2930 |
| G130, G150 | NONE | NONE | Error in the parameterization / configuration / commissioning procedure (18) | None | SINAMICS G130, G150 List Manual · p. 1644 |
| G120 | NONE | NONE | Error in the parameterization / configuration / commissioning procedure (18) | — | SINAMICS G120 · p. 902 |
The drives this code lives on
A08759 is described for G120, G130, G150, S120, S150. These are the converters of those families in our catalogue — price on request.
Questions technicians ask
What does alarm A08759 mean on a SINAMICS drive?
It is a CAN alarm: an already existing PDO COB-ID was allocated, so an identifier that is already in use has been assigned again. The alarm value in r2124, read as a decimal number, names the parameter concerned.
How do I fix alarm A08759?
Select another PDO COB-ID — that is the remedy the manuals give. The alarm needs no acknowledgment, so there is nothing to reset once the duplicate allocation has been replaced.
Where do I find the COB-ID that triggered A08759?
The alarm value in r2124, interpreted as a decimal number, is the number of the affected parameter, and the manual notes that the COB-ID is included in index 0.
Does A08759 stop the drive?
No. No reaction is assigned to this alarm and it does not have to be acknowledged; it reports a configuration error that should still be corrected by selecting another PDO COB-ID.
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 A08xxx group · SINAMICS manuals · Siemens manuals