What it means
F31845 reports a DRIVE-CLiQ communication error that has occurred from the Control Unit to the encoder involved — Encoder 1. The fault cause stored with the message is 11 (= 0B hex): a synchronization error during alternating cyclic data transfer. Depending on how the drive is configured, the same condition can also be issued as an alarm (A) or as a message without reaction (N) instead of a fault.
Why it appears
- A DRIVE-CLiQ communication error has occurred from the Control Unit to the encoder involved (Encoder 1).
- The fault cause in this message is 11 (= 0B hex): a synchronization error during alternating cyclic data transfer.
What to check
- Read the message value: in r0949 for the fault, or in r2124 when the condition appears as an alarm. The coding of the value is explained under «fault value» below.
- Carry out a POWER ON (switch-off/switch-on) as the manual prescribes as the remedy for this fault.
- Check the configured response in p0491 (Motor encoder fault response ENCODER), which the manual cross-references for this code; on the G130/G150 the manual additionally cross-references p9916 (DRIVE-CLiQ data transfer error shutdown threshold slave).
Reading the message value
- The message value holds the component number (%1) and the fault cause (%2).
- The information is coded in r0949/r2124 as 0000yyxx hex: yy = component number, xx = error cause.
- Fault cause 11 (= 0B hex): synchronization error during alternating cyclic data transfer.
Parameters the manual names
- r0949 — fault value: read the coded component number and fault cause of this fault here.
- r2124 — alarm value: read the same coding here when the condition is issued as an alarm.
- p0491 — Motor encoder fault response ENCODER: the response the drive applies to this encoder fault is set here.
- p9916 — DRIVE-CLiQ data transfer error shutdown threshold slave: the shutdown threshold the manual cross-references for this code.
Acknowledging and restarting
The fault is acknowledged IMMEDIATELY. The remedy the manual gives is a POWER ON (switch-off/switch-on). If the same condition is configured as an alarm (A) or as a message without reaction (N), the manual specifies no reaction and no acknowledgement (NONE) for it.
What differs between the drive families
Straight from the manuals' own fields — F31845 is not described identically everywhere.
| Drive family | Reaction | Acknowledge | Message class | Component | Manual |
|---|---|---|---|---|---|
| S120, S150 | Infeed: OFF2 Servo: ENCODER (IASC/DCBRK, NONE) Vector: ENCODER (IASC/DCBRK, NONE) Hla: ENCODER (NONE) | IMMEDIATELY | Internal (DRIVE-CLiQ) communication error (12) | Sensor Module Encoder 1 | SINAMICS S120, S150 List Manual · p. 3068 |
| G130, G150 | Vector: ENCODER (IASC/DCBRK, NONE) Infeed: OFF2 | IMMEDIATELY | Internal (DRIVE-CLiQ) communication error (12) | Sensor Module Encoder 1 | SINAMICS G130, G150 List Manual · p. 1752 |
The drives this code lives on
F31845 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 fault F31845 mean in SINAMICS drives?
It reports a DRIVE-CLiQ communication error from the Control Unit to Encoder 1. The fault cause is 11 (= 0B hex): a synchronization error during alternating cyclic data transfer.
How do I clear fault F31845?
Carry out a POWER ON (switch-off/switch-on) as the manual prescribes. The fault is acknowledged IMMEDIATELY.
Where can I read the fault cause of F31845?
In r0949 (fault value) or, when the condition appears as an alarm, in r2124 (alarm value). The value is coded 0000yyxx hex: yy is the component number, xx the error cause.
Can F31845 also appear as an alarm?
Yes. Depending on the drive configuration, the same condition can be issued as an alarm (A) or as a message without reaction (N); the manual then specifies no reaction and no acknowledgement for it.
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 F31xxx group · SINAMICS manuals · Siemens manuals