What it means
A31700 is an alarm for Encoder 1, assigned to the Sensor Module Encoder 1: the DRIVE-CLiQ encoder connected there is reporting that its internal effectivity tests do not supply the expected value. The manuals print two titles for this code — Encoder 1: Functional safety monitoring initiated
on the S120 and S150, Encoder 1: Effectivity test does not supply the expected value
on the G130 and G150 — and describe the trigger from two angles: either functional safety was activated and the self-test of the DRIVE-CLiQ encoder has detected a fault, or the DRIVE-CLiQ encoder fault word supplies fault bits that have been set. Both descriptions end at the same finding, which the drive writes into alarm value r2124: read as a binary number, bit x = 1 there means that effectivity test x was unsuccessful.
Why it appears
- Functional safety was activated, and the self-test of the DRIVE-CLiQ encoder has detected a fault.
- The DRIVE-CLiQ encoder fault word supplies fault bits that have been set — the encoder signals that an effectivity test did not supply the expected value.
What to check
- Read the alarm value r2124 as a binary number: every bit x set to 1 marks effectivity test x as unsuccessful, so the value tells you which test the encoder failed.
- Replace the encoder — the manuals name no other remedy for this alarm.
Reading the message value
- The message value carries the fault cause as a binary number; the manuals reference it as the alarm value r2124.
Bit x = 1: Effectivity test x unsuccessful.
Parameters the manual names
- r2124 (alarm value): holds the cause of this alarm in binary form — bit x = 1 means that effectivity test x was unsuccessful.
Acknowledging and restarting
This alarm requires no acknowledgment; the manuals specify none. The only remedial step they describe is to replace the encoder.
The same on every family
Every manual that describes A31700 gives it the same reaction, acknowledgement and message class.
| Drive family | Reaction | Acknowledge | Message class | Component | Manual |
|---|---|---|---|---|---|
| S120, S150 | NONE | NONE | Safety monitoring channel has identified an error (10) | Sensor Module Encoder 1 | SINAMICS S120, S150 List Manual · p. 3060 |
| G130, G150 | NONE | NONE | Safety monitoring channel has identified an error (10) | Sensor Module Encoder 1 | SINAMICS G130, G150 List Manual · p. 1745 |
The drives this code lives on
A31700 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 A31700 mean?
It is an Encoder 1 alarm: the DRIVE-CLiQ encoder reports that its internal effectivity tests do not supply the expected value. The trigger is described either as a failed encoder self-test after functional safety was activated or as set fault bits in the encoder fault word.
How do I fix alarm A31700?
The manuals give exactly one remedy: replace the encoder. Reading the alarm value r2124 in binary tells you which effectivity test x was unsuccessful.
Does A31700 have to be acknowledged?
No. The manuals specify no acknowledgment and no reaction for this alarm.
Where can I see which effectivity test failed?
In the alarm value r2124, interpreted binary: bit x = 1 means effectivity test x 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 A31xxx group · SINAMICS manuals · Siemens manuals