What it means
The manuals title this message COMM BOARD: Alarm 5
. It is raised by the CBE20 board when the sender was not found on SINAMICS Link — the participant expected as sender is not present on the link. The drive stores an alarm value in r2124 that identifies the situation and, where applicable, the affected sender address. Depending on the drive's configuration, the same condition can also be raised as a fault.
Why it appears
- CBE20 SINAMICS Link: the sender was not found on SINAMICS Link.
What to check
- Check the connection to the sender.
- Set p8811 and p8812[1] to identical values for all participants/nodes.
- Check parameter p8836 for all participants (the S120/S150 entries add this check).
Reading the message value
- The drive writes the alarm value into r2124; interpret it as a decimal number.
- 0: synchronization to the bus clock cycle unsuccessful.
- 1 ... 64: address of the sender that was not found.
Parameters the manual names
- r2124 — alarm value: read it as a decimal number to distinguish an unsuccessful synchronization to the bus clock cycle (0) from the address (1 ... 64) of the sender that was not found.
- p8811 — SINAMICS Link project selection: set it to the same value on all participants/nodes.
- p8812[1] — SINAMICS Link clock cycle settings: set it to the same value on all participants/nodes, together with p8811.
- p8836 — SINAMICS Link node address: check it for all participants.
- p8872 — SINAMICS Link PZD receive address: named by the manual in connection with this alarm.
Acknowledging and restarting
As an alarm, A50005 requires no acknowledgement and the drive takes no automatic action; the work lies in restoring the connection to the sender and the identical parameter settings on all participants. When the drive signals the same condition as a fault instead, that fault is acknowledged immediately.
The same on every family
Every manual that describes A50005 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. 3300 |
| G130, G150 | NONE | NONE | Communication error to the higher-level control system (9) | None | SINAMICS G130, G150 List Manual · p. 1937 |
The drives this code lives on
A50005 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 A50005 mean on a SINAMICS drive?
The CBE20 board reports that the sender was not found on SINAMICS Link. The alarm value in r2124 shows either 0 (synchronization to the bus clock cycle unsuccessful) or the address, 1 ... 64, of the sender that was not found.
How do I fix A50005?
Check the connection to the sender, then set p8811 and p8812[1] to identical values for all participants/nodes. The S120/S150 descriptions additionally say to check the node address p8836 for all participants.
Does A50005 have to be acknowledged?
No — as an alarm it needs no acknowledgement and the drive takes no automatic action. If the drive signals the same condition as a fault, that fault is acknowledged immediately.
Where do I see which sender is missing for A50005?
In r2124, interpreted as a decimal number: a value of 1 ... 64 is the address of the sender that was not found, while 0 means synchronization to the bus clock cycle was unsuccessful.
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 A50xxx group · SINAMICS manuals · Siemens manuals