What it means
Alarm A35911 is raised by a TM when the maximum permissible number of errors in the master sign-of-life has been exceeded in cyclic operation during clock-synchronous operation. When the alarm is output, the module outputs are reset up to the next synchronization. The manuals for G130, G150, S120 and S150 describe the message identically. Depending on how the drive is configured, the same condition can also be output as a fault or without any reaction.
Why it appears
- In cyclic operation, the maximum permissible number of errors in the master sign-of-life (clock synchronous operation) has been exceeded.
What to check
- Check the physical bus configuration, for example the terminating resistor and the shielding.
- Check the interconnection of the master sign-of-life (r4201 via p0915).
- Check whether the master correctly sends the sign-of-life, for example by setting up a trace with r4201.12 ... r4201.15 and using signal r4301.9 as the trigger.
- Check the bus and the master for their utilization level, for example whether the bus cycle time Tdp was set too short.
Parameters the manual names
- r4201 — TM15 system time for synchronization: it is interconnected via p0915 for the master sign-of-life, and its bits r4201.12 ... r4201.15 are traced to see whether the master sends the sign-of-life.
- p0915 — TM15 PROFIdrive PZD setpoint assignment: the interconnection through which the master sign-of-life (r4201) is linked in.
- r4301 — TM15 module synchronization: signal r4301.9 serves as the trigger for the trace of the master sign-of-life bits.
Acknowledging and restarting
As an alarm, A35911 does not have to be acknowledged. If the drive's configuration issues the same condition as a fault instead, it must be acknowledged IMMEDIATELY (POWER ON).
The same on every family
Every manual that describes A35911 gives it the same reaction, acknowledgement and message class.
| Drive family | Reaction | Acknowledge | Message class | Component | Manual |
|---|---|---|---|---|---|
| S120, S150 | NONE | NONE | Communication error to the higher-level control system (9) | None | SINAMICS S120, S150 List Manual · p. 3243 |
| G130, G150 | NONE | NONE | Communication error to the higher-level control system (9) | None | SINAMICS G130, G150 List Manual · p. 1905 |
The drives this code lives on
A35911 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 A35911 on a SINAMICS drive mean?
A TM reports that the maximum permissible number of errors in the master sign-of-life has been exceeded in cyclic operation during clock-synchronous operation. When the alarm is output, the module outputs are reset up to the next synchronization.
How is A35911 acknowledged and cleared?
As an alarm it requires no acknowledgement. If the drive is configured to output the same condition as a fault, it is acknowledged IMMEDIATELY (POWER ON).
Which parameters are used to diagnose A35911?
The master sign-of-life is interconnected via r4201 and p0915. To check whether the master sends it, trace r4201.12 ... r4201.15 with signal r4301.9 as the trigger.
Why are the TM outputs reset when A35911 appears?
Because when the alarm is output, the module outputs are reset up to the next synchronization.
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 A35xxx group · SINAMICS manuals · Siemens manuals