Automatic Synchronization - Siemens SINUMERIK 802D sl Function Manual

Gantry axes (G1)
6.3 Referencing and synchronizing gantry axes
During referencing, the reference point value of the leading axis is specified as the target
position for all axes in the grouping for the synchronization compensatory motion. This
position is then approached without axis coupling. The absolute encoders and distance-
coded encoders of the leading axis will be set to the current actual position of the leading
axis or to the reference point value; either of these options is set using the following machine
data:
MD34330 REFP_STOP_AT_ABS_MARKER
(distance-coded linear measuring system without destination point)
If only one reference cam is used for the leading and synchronized axes, then this must be
taken into account in the PLC user program.
6.3.2

Automatic synchronization

Automatic synchronization can take place:
● In referencing mode (see the section titled "Introduction")
● In the manner described below
If a gantry grouping is switched to follow-up mode, monitoring of the actual values between
the leading and synchronized axes is deactivated. The grouping is no longer synchronized
as a result. The leading axis sets IS "Gantry grouping is synchronous" to "0" regardless of
the positions of the axes.
If the gantry grouping is switched from follow-up mode to position control mode, axis
synchronism is automatically restored, provided the actual-value monitoring function does
not detect a difference between the positions of the leading and synchronized axes that is
greater than the setting in MD36030.
In this case, a new setpoint is specified for the synchronized axis without interpolation. The
positional difference detected earlier is then corrected by the position controller. The
correction causes only the synchronized axis to move.
The motion sequence of the synchronized axis is similar to the situation in which the
grouping switches from the "Hold" state to position control mode. In this case, the position
specified by the position controller before the grouping is halted is set again on condition that
the zero speed monitor has not activated alarm 25040 (with follow-up as alarm reaction) in
the meantime.
The same tolerance window is used for this type of automatic synchronization as for the
standstill monitoring function:
MD36030 STANDSTILL_POS_TOL (standstill tolerance)
Parameter set-dependent loading takes place with the following machine data:
MD36012 STOP_LIMIT_FACTOR (exact stop coarse/fine factor and standstill)
96
Turning, Milling, Nibbling
Function Manual, 11/2012, 6FC5397-1CP10-5BA0