Siemens SINUMERIK 828D Function Manual page 1204

R1: Reference point approach
15.3 Channel­specific referencing
Referencing status
The referencing status of the machine axis is reset with the start of the reference point approach:
DB31, ... DBX60.4 (referenced / synchronized 1)
DB31, ... DBX60.5 (referenced / synchronized 2)
Completion of reference point approach
As soon as channel-specific reference approach has been successfully completed for all machine axes involved,
this is acknowleged with:
DB21, ... DBX36.2 (all axes with obligatory reference point are referenced)
Cancellation of reference point approach
In channel-specific reference point approach the machine axis is traversed in the channel to which that axis is
currently assigned as channel axis.
For aborting the reference point approach either mode group reset or channel reset for the corresponding
channel must be activated:
DB11, ... DBX0.7 (mode group reset)
DB21, ... DBX7.7 (channel reset)
All machine axes for which the reference point approach is not yet successfully completed when the action is
cancelled remain in status "Not referenced":
DB31, ... DBX60.4 (referenced / synchronized 1)
DB31, ... DBX60.5 (referenced / synchronized 2)
Basic Functions
1204
Function Manual, 09/2011, 6FC5397-0BP40-2BA0