Siemens sinumerik 840D sl Function Manual page 148

Detailed description
2.2 Referencing and synchronization of gantry axes
Synchronization process
A synchronization process is always required in the following cases:
• after the reference point approach of all axes included in a grouping,
• if the axes become de-synchronized (s below).
Operational sequence failure
If the referencing process described above is interrupted as a result of disturbances or a
RESET, proceed as follows:
• Abort within section 1 or 2:
• Abort in section 3:
Restart gantry synchronization
Synchronization of the gantry axes can be started with IS "Start gantry synchronization"
under the following conditions only:
• JOG/REF mode must be active. The following interface signal must be set:
• DB31, ... DBX 101.5 = 0 (gantry grouping is synchronized)
• All grouping axes operate within the tolerance windows:
• Axes are not referenced in the relevant NC channel
If the gantry synchronization process is not started from the referencing process by means of
IS "Start gantry synchronization", then instead of giving the following reference position:
MD34100 $MA_REFP_SET_POS (reference point value/destination point for distancecoded
system)
The current actual position of the leading axis is specified as the target position and
approached in the uncoupled state.
Note
Automatic synchronization can be locked by the leading axis by means of the following
interface signal:
DB31, ... DBX29.5 (automatic synchronization locking)
This always makes sense if no axis enabling signal has yet been issued for the axes. In this
case, the synchronization process should also be started explicitly with the interface signal:
DB31, ... DBX29.4 = 1 (start synchronization of gantry)
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Restart reference point with leading axis (see section 1)
In cases where the gantry axes have not yet been referenced (IS
"Referenced/Synchronized" = 1), the gantry synchronization process can be started again
with IS "Synchronize gantry grouping".
DB11, DBX5.2 (REF active machine function)
DB31, ... DBX 101.4 ("Gantry synchronization ready to start")= 1
DB21, ... DBX33.0 = 0 (referencing active)
Special functions: Gantry Axes (G1)
Function Manual, 11/2006, 6FC5397-2BP10-2BA0