Automatic Synchronization - Siemens SINUMERIK 808D Function Manual

Allowance for deviations in distance between the zero mark and the reference point must be made for specific axes via the
machine data:
● MD34080 REFP_MOVE_DIST (reference point distance)
● MD34090 REFP_MOVE_DIST_CORR (reference point offset/absolute offset)
Referencing direction selection
The zero mark leveling function of the following axis can be defined using the following machine data:
MD37150 GANTRY_FUNCTION_MASK bit 1
Bit Value Meaning
1 0 The zero mark leveling function of the following axis is similar to
MD34010 REFP_CAM_DIR_IS_MINUS.
1 The zero mark leveling function of the master axis is the same as the slave axis
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.
7.3.2

Automatic synchronization

Automatic synchronization can take place:
● In "REF.POINT" mode (see the section titled "Introduction (Page 44)")
● 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)
Note
The following interface signal blocks automatic synchronization in all modes except "REF.POINT" mode:
DB380x.DBX5005.5 (automatic synchronization locking)
If automatic synchronization is to be activated, DB380x.DBX5005.5 must be set to "0".
Following this, one of the axes in the gantry grouping must be switched from follow-up mode to position-controlled mode.
This is achieved with the interface signals:
DB380x.DBX0001.4 = 1 (follow-up mode)
DB380x.DBX0002.1 = 1 (servo enable)
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Function Manual
01/2017