Siemens Sinumerik 840D sl Programming Manual page 549

NOTICE
Leading spindle and axis operation
If, prior to the coupling being defined, the leading spindle is in axis operation, the velocity limit
value from machine data
MD32000 $MA_MAX_AX_VELO (maximum axis velocity) will still apply even after the
coupling is activated.
To avoid this behavior, the axis must be switched to spindle mode (M3 S... or M4 S...)
prior to the coupling being defined.
Further information
Define synchronized spindle pair
Configured coupling:
For the configured coupling, the leading and following spindles are defined in machine data.
The configured spindles cannot be changed in the part program. The coupling can be
parameterized in the part program using COUPDEF (on condition that no write protection is
valid).
User-defined coupling:
COUPDEF can be used to redefine or change a coupling in the part program. If a coupling is
already active, it has to be deleted first with COUPDEL before a new coupling is defined.
Define coupling: COUPDEF
A coupling is defined in its entirety by:
COUPDEF(<FS>,<LS>,<TFS>,<TLS>, block change behavior, coupling type)
Following spindle (FS) and leading spindle (LS)
The coupling is uniquely defined using the axis names for the following spindle (FS) and the
leading spindle (LS). The axis names have to be programmed with every COUPDEF operation.
The other coupling parameters are modal and only have to be programmed if they change.
Example:
COUPDEF(S2,S1)
Job planning
Programming Manual, 02/2011, 6FC5398-2BP40-1BA0
Axis couplings
9.5 Synchronous spindle
549