Siemens SINUMERIK 840Di Function Manual page 1486

Detailed Description
2.8 Referencing in follow-up mode
Starting the referencing operation
If the machine axis is in follow-up mode:
DB31, ... DBX61.3 (follow-up mode active) == TRUE
at the start of reference point approach, the measuring system is referenced in follow-up
mode.
(If the machine axis is not in follow-up mode at the start of reference point approach,
"normal" NC-controlled reference point approach is performed.)
Referencing in follow-up mode can be started in the following modes:
• JOG-REF: Traversing keys
• AUTOMATIC: Part program command G74
Sequence of referencing operation (JOG-REF mode)
1. Activate follow-up mode of machine axis:
2. Take into account activation of follow-up mode:
3. Switch to JOG-REF mode
4. External movement of machine axis across encoder zero mark or parameterized number
5. The measuring system is referenced after the encoder zero mark or the assigned number
Aborting the reference operation
An active referencing operation can be aborted by:
• Deselecting follow-up mode
• NC-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 instruction G74.
2-46
DB31, ... DBX1.4 (follow-up mode) = 0
DB31, ... DBX2.1 (servo enable) = 0
DB31, ... DBX61.3 (follow-up mode active) = 1
of distance-coded reference marks. The referencing operation is started internally in the
NC as soon as the machine axis is moved:
DB31, ... DBX61.4 (axis/spindle stationary) = 0
of distance-coded reference marks have been successfully detected:
DB31, ... DBX60.4/60.5 (referenced/synchronized 1/2) = 1
Reference Point Approach (R1)
Function Manual, 08/2005 Edition, 6FC5397-0BP10-0BA0