Synchronization Control - HEIDENHAIN TNC 415 Technical Manual

1.10.1 Synchronization control

The TNC monitors the synchronization of the master and slave axes. If the positions of the master
and slave axes differ by a distance greater than that entered in MP855.x, the error message GROSS
POSITIONING ERROR <AXIS> #A appears indicating the slave axis. The positional difference is
shown in the LAG display for the slave axis. Synchronization monitoring is entered in MP855.x of the
slave axis. Machine parameter MP860.x defines the datum for synchronization control.
MP860.x = 0: Datum at position upon switch-on
When the machine is switched on it is assumed that the master and slave axes are synchronized
with one another. Their position upon switch-on is taken as the synchronization reference. In this
mode, passing over the reference mark is only necessary for the master axis, and only if the defined
references are to be reproduced. Synchrony monitoring begins immediately upon switch-on.
MP860.x = 1: Datum at reference marks (machine datum)
Both axes position to the same reference value when they have passed over their respective
reference marks. The default setting can be modified with MP960 (machine datum).
In this mode, any offset between the two axes is compensated in the slave axis at the speed from
MP1330 after both reference marks are traversed, and synchronization does not activate until
compensation is completed. The way in which the reference marks are traversed (MP1350) must be
set the same for both axes. The master axis must be defined before the slave axis in the sequence
for approaching the reference marks (MP1340).
Where rotary encoders are used for linear measurement (MP1350 = 2), only one end position switch
should be used for both axes because the reference end position marker for the slave axis is only
used to evaluate the reference mark and not to evaluate the direction of traverse when controlling
the sequence. The direction of traverse is defined by the value of the reference end position marker
for the master axis.
Traversing the reference mark is completed when one reference mark has been evaluated for both
axes (see also section "Reference marks").
MP855 Synchronization monitoring
Entry: 0 to 100.0000 [mm]
0 = Monitoring inactive
MP855.0 X axis
MP855.1 Y axis
MP855.2 Z axis
MP855.3 4th axis
MP855.4 5th axis
MP860 Datum for synchronization control
Entry: 0 or 1
0 = Datum at position upon switch-on
1 = Datum at reference marks (machine datum)
MP860.0 X axis
MP860.1 Y axis
MP860.2 Z axis
MP860.3 4th axis
MP860.4 5th axis
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