Sinumerik Alarm 25022 Axis %1 encoder %2 warning %3
%1 = Axis name, spindle number
%2 = Encoder number
%3 = Error fine coding
This alarm occurs only with absolute encoders on the SIMODRIVE 611D, if zero mark monitoring has been activated for them (cf. $MA_ENC_ZERO_MONITORING): In this case, the absolute position of the absolute encoder could not be read without any errors: Breakdown of error fine codings: (Bit 0 not used) Bit 1 Parity error Bit 2 Alarm bit of the encoder Bit 3 CRC error Bit 4 Timeout start bit for EnDat transfer is missing Only display of this alarm, since the absolute position itself is not required at this time for control/contour. Frequent occurring of this alarm indicates that absolute encoder transfer or the absolute encoder itself are faulty and that the absolute value determined with the next encoder selection or Power On situation could possibly be wrong.
– Alarm display.
Replace the encoder, replace or screen the encoder cable (or deactivate zero mark monitoring).
Clear alarm with the Delete key or NC START.
- Siemens Diagnostics Guide by Siemens