Zero mark selection when several zero mark signals occur
If several encoder zero marks are detected in the traversing range of the machine axis due to
machine-specific factors, e.g. reduction gear between encoder and load, a proximity switch
must be mounted on the machine and connected via a digital input of the NCU interface in order
to clearly determine the reference point.
Note
Contact-less proximity switch signal: Zero mark selection
The processing of the proximity switch signal is performed exclusively in the drive. Connection
and parameterization, see Section "Hardware signals (Page 296)".
Enable
The "Referencing in follow-up mode" function is enabled with:
MD34104 $MA_REFP_PERMITTED_IN_FOLLOWUP = TRUE
Starting the referencing operation
If the machine axis is in follow-up mode (DB31, ... DBX61.3 == TRUE) at the start of reference
point approach, the measuring system is referenced in 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 the referencing operation (JOG-REF mode)
1. Activate follow-up mode of machine axis:
DB31, ... DBX1.4 (follow-up mode) = 1
DB31, ... DBX2.1 (controller enable) = 0
2. Wait for activation of follow-up mode:
DB31, ... DBX61.3 (follow-up active) == 1
3. Switch to JOG mode, REF machine function
4. External motion of machine axis across encoder zero mark or parameterized number of
distance-coded reference marks. The referencing operation is started internally in the NC
as soon as the machine axis is moved: The following NC/PLC interface signal is reset as
feedback:
DB31, ... DBX61.4 (axis/spindle stationary) == 0
5. The measuring system is referenced after the encoder zero mark or the assigned number
of distance-coded reference marks have been successfully detected: The following NC/
PLC interface signal is set as feedback:
DB31, ... DBX60.4/60.5 (referenced/synchronized 1/2) == 1
Axes and spindles
Function Manual, 06/2019, A5E47437747B AA
R1: Referencing
10.8 Referencing in follow-up mode
319