What it means
The drive raises F08701 because the CANopen NMT state has been changed away from “operational”: the drive was switched to the NMT state “pre-operational” or to the NMT state “stopped”. While “pre-operational” is active, process data cannot be transferred; in the NMT state “stopped”, no process data and no service data can be transferred. The fault value stored in r0949 shows which of the two transitions the drive detected.
Why it appears
- The CANopen NMT state was changed away from “operational” — either a transition to “pre-operational” or a transition to “stopped”.
What to check
- Nothing needs to be checked or changed: the manual states that a remedy is
Not necessary. Acknowledge the fault and continue operation.
Reading the message value
- The fault value is stored in r0949 and is interpreted as a decimal number:
- 1: CANopen NMT state transition from “operational” to “pre-operational”.
- 2: CANopen NMT state transition from “operational” to “stopped”.
Parameters the manual names
- r0949 — fault value: read it as a decimal number to see whether the NMT state went to “pre-operational” (1) or to “stopped” (2).
Acknowledging and restarting
Acknowledge the fault; operation can then be continued. The manual lists no further measures for this fault — it only reports the CANopen NMT state change and requires no remedy beyond acknowledgement.
What differs between the drive families
Straight from the manuals' own fields — F08701 is not described identically everywhere.
| Drive family | Reaction | Acknowledge | Message class | Component | Manual |
|---|---|---|---|---|---|
| S120, S150 | Infeed: OFF2 Servo: OFF3 Vector: OFF3 Hla: OFF3 | IMMEDIATELY | Communication error to the higher-level control system (9) | None | SINAMICS S120, S150 List Manual · p. 2926 |
| G130, G150 | Vector: OFF3 Infeed: OFF2 | IMMEDIATELY | Communication error to the higher-level control system (9) | None | SINAMICS G130, G150 List Manual · p. 1640 |
| G120 | OFF3 | IMMEDIATELY | Communication error to the higher-level control system (9) | — | SINAMICS G120 · p. 900 |
The drives this code lives on
F08701 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 fault F08701 mean on a SINAMICS drive?
It reports that the CANopen NMT state was changed away from “operational” — to “pre-operational” or to “stopped”. In “pre-operational” no process data can be transferred, and in “stopped” neither process data nor service data.
How do I clear fault F08701?
No remedy is necessary. Acknowledge the fault and continue operation.
What do the fault values 1 and 2 in r0949 mean for F08701?
Value 1 means the CANopen NMT state changed from “operational” to “pre-operational”; value 2 means it changed from “operational” to “stopped”.
Why does F08701 occur without any drive hardware problem?
The fault is only a report that the CANopen NMT state was changed; the manual states that no remedy is necessary and operation can continue after 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