What it means
A35905 (TM: Parameter access) appears when the Control Unit attempts to write an illegal parameter value to the Terminal Module — the module is offered a value it cannot accept. The drive's configuration decides in which form the condition is issued: as the alarm A35905 shown here, as a fault, or with no reaction at all. Standing as an alarm, the message does not trip the drive.
Why it appears
- The Control Unit attempted to write an illegal parameter value to the Terminal Module.
What to check
- Check whether the firmware version of the Terminal Module, shown in r0158, matches the firmware version of the Control Unit, shown in r0018. Which firmware versions match each other is listed in the readme.txt file on the memory card.
- If required, replace the Terminal Module.
Parameters the manual names
- r0158 — read the Terminal Module firmware version here and compare it with the Control Unit; the parameter chapter titles r0158 "VSM FW version" (Voltage Sensing Module firmware version).
- r0018 — read the Control Unit (CU) firmware version here to compare it against r0158 when the message appears.
Acknowledging and restarting
No acknowledgement is needed while the code stands as an alarm. If the drive's configuration issues the same condition as a fault instead, it is acknowledged immediately by switching the power on (POWER ON); in the form issued with no reaction there is likewise nothing to acknowledge.
The same on every family
Every manual that describes A35905 gives it the same reaction, acknowledgement and message class.
| Drive family | Reaction | Acknowledge | Message class | Component | Manual |
|---|---|---|---|---|---|
| S120, S150 | NONE | NONE | Hardware/software error (1) | Terminal Module (TM) | SINAMICS S120, S150 List Manual · p. 3242 |
| G130, G150 | NONE | NONE | Hardware/software error (1) | Terminal Module (TM) | SINAMICS G130, G150 List Manual · p. 1904 |
The drives this code lives on
A35905 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 A35905 in SINAMICS mean?
The Control Unit attempted to write an illegal parameter value to the Terminal Module. Depending on the drive's configuration, the same condition can also be issued as a fault or with no reaction.
How do I clear A35905?
Compare the Terminal Module firmware version in r0158 with the Control Unit firmware version in r0018; the combinations that match are listed in the readme.txt file on the memory card. If required, replace the Terminal Module.
Which parameter shows the Terminal Module firmware version for A35905?
r0158 — the parameter chapter titles it "VSM FW version" (Voltage Sensing Module firmware version). Compare it with r0018, the Control Unit firmware version.
Does A35905 have to be acknowledged?
Not while it appears as an alarm. If the drive issues the condition as a fault, it is acknowledged immediately by switching the power on (POWER ON).
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