Sinumerik Alarm 20004 Channel %1 axis %2 reference mark missing
%1 = Channel number
%2 = Axis name, spindle number
In the distance-coded length measurement system two reference marks were not found within the defined searching distance (axis-specific MD: 34060 REFP_MAX_MARKER_DIST). No reduction cam is required for distance-coded scales (but an existing cam will be evaluated). The conventional direction key determines the direction of search. The searching distance 34060 REFP_MAX_MARKER_DIST, within which the two reference point markers are expected is counted commencing at the start point.
– NC Stop on alarm.
– NC Start disable in this channel.
– Alarm display.
– Interface signals are set.
– If the axis is a single axis when this alarm is triggered, the alarm is only effective for this axis (not effective for e.g. the channel or mode group)
Please inform the authorized personnel/service department. Determine the distance between 2 odd reference point markers (reference point marker interval). This value (which is 20.00 mm on Heidenhain scales) must be entered in the machine data 34060 REFP_MAX_MARKER_DIST. Check the reference point track of the scale including the electronics for the evaluation.
Clear alarm with the RESET key. Restart part program
- Siemens Diagnostics Guide by Siemens