Siemens SINUMERIK 840D Function Manual page 273

Activation of axis compensations
Compensation functions can be activated for both the leading axis and the synchronized axes.
Compensation values are applied separately for each individual gantry axis. These values
must therefore be defined and entered for the leading axis and the synchronized axes during
start-up.
The compensations do not become operative internally in the control until the axis is referenced
or the gantry grouping synchronized. The following applies:
Compensation type
Backlash compensation
LEC
Sag compensation
Temperature compensation
If a movement by the synchronized axis (axes) is caused by an active compensation, a travel
command is displayed for the synchronized axis (axes) independently of the leading axis.
Monitoring functions effective
Analogous to normal NC axes, the following monitoring functions do not take effect for gantry
axes until the reference point is reached (IS "Referenced/Synchronized"):
● Working area limits
● Software limit switch
● Protection zones
The axial machine data values are used as monitoring limit values for the synchronized axes
as well.
Multi-channel block search
The cross-channel block search in Program Test mode (SERUPRO "Search Run by Program
test") can be used to simulate the traversal of gantry axis groupings.
Note
For further information on the multichannel block search SERUPRO, please see:
Further information
Function Manual Basic Functions; Mode group, channel, program operation, program test
Axes and spindles
Function Manual, 06/2019, A5E47437747B AA
9.3 Referencing and synchronization of gantry axes
Takes effect when
Axis is referenced
Axis is referenced
Gantry grouping is synchron‐
ized
Gantry grouping is synchron‐
ized
G1: Gantry axes
PLC interface signal
"Referenced/Synchronized"
"Referenced/Synchronized"
"Gantry grouping is synchronized"
"Gantry grouping is synchronized"
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