What it means
A08520 is reported by the PN/COMM board and points to an error in the non-cyclic channel: the manual names the memory or the buffer status of this channel as the source. Which of the two applies is stored as the alarm value in r2124. Depending on how the drive is configured, the same condition can also appear as fault F08520 instead of the alarm.
Why it appears
- The buffer status of the non-cyclic channel has an error — the alarm value in r2124 then reads 0.
- The memory of the non-cyclic channel has an error — the alarm value in r2124 then reads 1.
What to check
- Read the alarm value in r2124 as a decimal number to establish whether the buffer status (0) or the memory (1) of the non-cyclic channel is affected.
- Check the communications link — this is the remedy the manual gives for this message.
Reading the message value
- The drive places the alarm value from r2124 into the message value (%1); the manual says to interpret it as a decimal number.
- 0: Error in the buffer status.
- 1: Error in the memory.
Parameters the manual names
- r2124 — alarm value of this message: read it as a decimal number to tell whether the error sits in the buffer status (0) or in the memory (1) of the non-cyclic channel.
Acknowledging and restarting
A08520 needs no acknowledgment as an alarm. If the drive outputs the same condition as fault F08520, the manual specifies immediate acknowledgment before the drive is started again. The condition triggers no automatic shutdown, so after the communications link has been checked the drive can be restarted; r2124 shows whether the buffer status (0) or the memory (1) was the trigger.
The same on every family
Every manual that describes A08520 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. 2920 |
| G130, G150 | NONE | NONE | Communication error to the higher-level control system (9) | None | SINAMICS G130, G150 List Manual · p. 1635 |
The drives this code lives on
A08520 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 SINAMICS alarm A08520 mean?
The PN/COMM board raises it when the non-cyclic channel has an error: either the buffer status or the memory of that channel is affected. The alarm value in r2124, read as a decimal, distinguishes the two cases (0 = buffer status, 1 = memory).
How do I clear A08520?
The manual's remedy is to check the communications link. Read r2124 as well to see whether the buffer status or the memory of the non-cyclic channel caused the message.
Does A08520 need to be acknowledged?
No — as an alarm it requires no acknowledgment. If the drive is configured to issue the same condition as fault F08520 instead, that fault must be acknowledged immediately.
Does A08520 stop the drive?
No. The manual assigns no automatic drive reaction to this condition, neither as alarm nor as fault. The issue concerns the non-cyclic channel, and the drive can be restarted once the communications link has been checked.
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 A08xxx group · SINAMICS manuals · Siemens manuals