Siemens SINUMERIK 840D sl Function Manual page 1598

Detailed description
2.8 Referencing in followup mode
Starting the referencing operation
If the machine axis is operating in the follow-up mode at the start of reference point
traversing, (DB31,... DBX61.3 == TRUE) the measuring system will be referenced in the
follow-up mode.
If the machine axis is not operating in the follow-up mode at the start of reference point
traversing, the "normal" from the NC controlled reference point travels is carried out.
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
• 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 instruction G74.
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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
Basic logic functions: Reference Point Approach (R1)
Function Manual, 11/2006, 6FC5397-0BP10-2BA0