What it means
A01943 appears when two things coincide: the bus is in the data exchange state and clock synchronous operation has been selected via the parameterizing telegram, and the global control telegram for synchronization is being received irregularly. The abbreviations in the alarm title name the two buses it concerns — PB stands for PROFIBUS and PN for PROFINET. The alarm is informational in character: the drive itself takes no reaction and keeps operating, and it does not have to be acknowledged.
Why it appears
- The master is sending the global control telegram at irregular intervals.
- The master is using a clock synchronous DP clock cycle different from the one that was transferred to the slave in the parameterizing telegram.
What to check
- Check the master application and the bus configuration.
- Check that the clock cycle entered when configuring the slave is consistent with the clock cycle setting at the master.
Acknowledging and restarting
No acknowledgement is required. The alarm reports a condition on the bus side; the drive itself takes no action while it is present.
The same on every family
Every manual that describes A01943 gives it the same reaction, acknowledgement and message class.
| Drive family | Reaction | Acknowledge | Message class | Component | Manual |
|---|---|---|---|---|---|
| G130, G150 | NONE | NONE | Communication error to the higher-level control system (9) | None | SINAMICS G130, G150 List Manual · p. 1494 |
| S120, S150 | NONE | NONE | Communication error to the higher-level control system (9) | None | SINAMICS S120, S150 List Manual · p. 2718 |
The drives this code lives on
A01943 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 A01943 mean on a SINAMICS drive?
During clock-synchronous PROFIBUS or PROFINET operation, the global control telegram for synchronization is arriving irregularly while the bus is in the data exchange state.
How do I clear A01943?
Check the master application and the bus configuration, and make sure the clock cycle entered when configuring the slave is consistent with the clock cycle setting at the master. No acknowledgement of the drive is needed.
Does A01943 stop the drive?
No. The alarm triggers no reaction, so the drive keeps operating; it only signals that the synchronization telegrams from the master are not arriving regularly.
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 A01xxx group · SINAMICS manuals · Siemens manuals