What it means
F08703 is raised when the drive object topology contains more than the permitted maximum of 8 drive objects with the "CAN" function module. The limit is not arbitrary but comes from the CANopen standard: In the CANopen standard, a maximum of 8 CANopen device modules (drive objects with function module "CAN") are defined for each CANopen slave.
Depending on the drive's configuration, the same condition can also be signalled as an alarm.
Why it appears
- More than the maximum of 8 drive objects with the "CAN" function module are configured in the topology.
- The limit follows from the CANopen standard, which defines a maximum of 8 CANopen device modules — that is, drive objects with the function module "CAN" — for each CANopen slave.
What to check
- Re-commission the topology with a maximum of 8 drive objects that have the "CAN" function module selected.
- For drive objects that do not require CAN, deselect the "CAN" function module; the manual references r0108.29 for this step, so check r0108 (drive object function module) to identify the drive objects that still have "CAN" selected.
Parameters the manual names
- r0108 (drive object function module, DO fct mod) shows which function module is selected for each drive object — use r0108.29 to find the drive objects whose "CAN" function module must be deselected to get back to 8 or fewer.
Acknowledging and restarting
Acknowledge the fault immediately once the topology has been corrected. When the drive signals the same condition as an alarm instead of a fault, it triggers no reaction and requires no acknowledgement.
What differs between the drive families
Straight from the manuals' own fields — F08703 is not described identically everywhere.
| Drive family | Reaction | Acknowledge | Message class | Component | Manual |
|---|---|---|---|---|---|
| S120, S150 | Infeed: OFF2 (NONE, OFF1) Servo: OFF3 (NONE, OFF1, OFF2) Vector: OFF3 (NONE, OFF1, OFF2) Hla: OFF3 (NONE, OFF1, OFF2) | — | Error in the parameterization / configuration / commissioning procedure (18) | None | SINAMICS S120, S150 List Manual · p. 2926 |
| G130, G150 | Vector: OFF3 (NONE, OFF1, OFF2) Infeed: OFF2 (NONE, OFF1) | IMMEDIATELY | Error in the parameterization / configuration / commissioning procedure (18) | None | SINAMICS G130, G150 List Manual · p. 1641 |
The drives this code lives on
F08703 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 fault F08703 mean in SINAMICS?
That more than the permitted maximum of 8 drive objects with the "CAN" function module are configured in the topology. The CANopen standard allows at most 8 CANopen device modules per CANopen slave.
How do I clear fault F08703?
Re-commission the topology with a maximum of 8 drive objects with the "CAN" function module, or deselect the "CAN" function module on drive objects that do not need it — r0108.29 shows which objects have it selected. Then acknowledge the fault.
Why is the limit exactly 8 CAN drive objects?
Because the CANopen standard defines a maximum of 8 CANopen device modules — drive objects with the function module "CAN" — for each CANopen slave.
Can F08703 also appear as an alarm?
Yes. Depending on the drive's configuration, the same condition can be signalled as an alarm; it then triggers no reaction and requires no acknowledgement.
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 F08xxx group · SINAMICS manuals · Siemens manuals