Datum At Position After Switch-On (Mp860.X = 0) - HEIDENHAIN TNC 426 PB/M Technical Manual

Datum at position
after switch-on
(MP860.x = 0)
Datum at reference
marks
(MP860.x = 1)
6 – 88
Entry for the slave axis
With MP860.x you can select whether the position after switch-on should be
used as a synchronization reference. Master and slave axes must be at
identical positions. If the defined datums are to be reproduced, then only the
master needs to be moved over the reference mark.
Monitoring of synchronized axes begins immediately upon switch-on.
Entry for the slave axis
With MP860.x you can select whether the position should be ascertained by
traversing the reference marks. After crossing over the reference mark, the
master and slave axes are positioned to the same value. The default setting
can be corrected with MP960.x (machine datum). In order for MP960.x to be
set, the axes must traverse the reference marks with MP860.x = 0, so that no
compensation movements are made. An offset in the axes is corrected after
both reference marks are traversed. Reference mark traverse is ended as
soon as a reference mark is traversed in both axes. The monitoring function is
not active until after the compensation movement. The monitoring function is
not active before the reference marks are traversed.
Conditions:
n
The same type of reference mark traverse must be set for both the master
and slave axes (MP1350.x).
n
The velocity with which an offset (after traversing a reference mark or
emergency stop) is compensated for is defined in MP1330.x for the slave
axis.
n
In the sequence for traversing the reference marks (MP1340.x), the master
axis must be defined before the slave axis.
n
The compensation movement can not be stopped with an NC stop (only
with an emergency stop).
n
The compensation movement is not considered in the following words:
• W1026 (Axes in position)
• W1028 (Axes in motion)
n
If the master axis has traversed the reference mark at the time of an NC stop
or an emergency stop, but the slave axis has not yet crossed it, then the
slave axis can only be moved across it by using the axis-direction keys.
n
Using a linear encoder: it is sufficient if the master axis has one reference
end position.
n
Using the speed encoder for linear measurement: One reference end
position is enough, but the NC needs a reference end position signal for
both axes (W1054).
HEIDENHAIN Technical Manual TNC 426, TNC 430