Siemens SINUMERIK 840D sl Function Manual page 1178

R1: Referencing
15.8 Referencing in follow-up mode
An active referencing operation can be aborted by:
● Deselecting follow-up mode
● NCK Reset
Response when measuring systems are already referenced
A measuring system that has already been referenced can only be re-referenced in
AUTOMATIC mode using part program statement G74.
Sequence of referencing operation (AUTOMATIC mode)
1. Switch to AUTOMATIC mode.
2. Start the part program.
3. Activate follow-up mode of machine axis:
DB31, ... DBX1.4 (follow-up mode) = 0
DB31, ... DBX2.1 (controller enable) = 0
4. Take into account activation of follow-up mode:
DB31, ... DBX61.3 (follow-up active) = 1
5. The referencing operation is started internally in the NC as soon as part program statement
G74 is processed.
6. External motion of machine axis across encoder zero mark or parameterized number of
distance-coded reference marks.
7. The measuring system is referenced after the encoder zero mark or the assigned number
of distance-coded reference marks have been successfully detected:
DB31, ... DBX60.4/60.5 (referenced/synchronized 1/2) = 1
8. The block change occurs after the referencing operation has been successfully completed.
Aborting the reference operation
An active referencing operation can be aborted by:
● Deselecting follow-up mode
● NCK Reset
Response when measuring systems are already referenced
A measuring system that you have already referenced can be re-referenced.
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Function Manual, 01/2015, 6FC5397-0BP40-5BA2
Basic Functions