Siemens SINUMERIK 840D sl Function Manual page 155

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:
Restart reference point with leading axis (see section 1)
• Abort in section 3:
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".
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:
DB11, DBX5.2 = 1 (active machine function REF)
• DB31, ... DBX 101.5 = 0 (gantry grouping is synchronized)
• All grouping axes operate within the tolerance windows:
DB31, ... DBX 101.4 = 1(gantry synchronization process ready to start)
• Axes are not referenced in the relevant NC channel
DB21, ... DBX33.0 = 0 (referencing active)
If the gantry synchronization process is not started from the referencing process by means of
IS "Start gantry synchronization process", then the reference position is not specified as
target position for the synchronous axes:
MD34100 $MA_REFP_SET_POS (reference point value/destination point for distance­coded
system)
Special Functions
Function Manual, 09/2011, 6FC5397-2BP40-2BA0
2.3 Referencing and synchronization of gantry axes
G1: Gantry axes
155