Automatic Synchronization - Siemens SINUMERIK 840D Function Manual

G1: Gantry axes
9.3 Referencing and synchronization of gantry axes
Selecting the reference point
To ensure that the shortest possible paths are traversed when the gantry axes are referenced,
the reference point values from leading and synchronous axes should be the same in the
machine data:
MD34100 $MA_REFP_SET_POS (reference point value/destination point for distancecoded
system)
Allowance for deviations in distance between the zero mark and the reference point must be
made for specific axes via the machine data:
MD34080 $MA_REFP_MOVE_DIST (reference point distance)
MD34090 $MA_REFP_MOVE_DIST_CORR (reference point offset/absolute offset)
Referencing direction selection
The zero mark search direction of the synchronous axis can be defined via the machine data:
MD37150 $MA_GANTRY_FUNCTION_MASK, Bit 1
Bit
1
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 distanced-coded
encoders of the leading axis will be set to the current actual position of the leading axis or to the
reference point by the following machine data:
MD34330 $MA_REFP_STOP_AT_ABS_MARKER (Distancecoded linear measuring system
without destination point)
If only one reference cam is used for the leading and synchronous axes, then this must be taken
into account in the PLC user program.
9.3.2

Automatic synchronization

Automatic synchronization can take place:
● in the referencing mode (see Section "Introduction (Page 264)")
● in other modes, as described below:
If a gantry grouping is switched to follow-up mode, monitoring of the actual values between the
leading and synchronized axes is disabled. The grouping is no longer synchronized as a result.
Independent of axes positions, the following interface signal will be set to 0 (from leading axis)
DB31, ... DBX101.5 (gantry grouping is synchronous)
If the gantry grouping is switched from follow-up mode to position control mode, axis
synchronism is automatically restored provided the actual-value monitor does not detect a
270
Value Meaning
0 Zero mark search direction of the synchronous axis analog to machine data:
MD34010 $MA_REFP_CAM_DIR_IS_MINUS
1 Zero mark search direction of the synchronous axis the same as the leading axis
Axes and spindles
Function Manual, 06/2019, A5E47437747B AA