Coupling Cascading; Compatibility; Adaptive Cycles - Siemens SINUMERIK 840D sl Function Manual

5.5.6

Coupling cascading

Coupling cascades
The coupling modules can be connected in series. The following axis/spindle of a coupling
module then becomes the leading axis/spindle of another coupling module. This results in a
coupling cascade.
Multiple coupling cascades in series is also possible. The internal computation sequence of
the individual coupling modules is performed so that there is no position offset in the coupling
relationship. This also applies for a cross-channel cascading.
Example:
Two new coupling modules are created. For the coupling module with following axis X2, the
leading axis X1 is defined. For the coupling module with following axis X2, the leading axis X2
and A1 are defined.
Programming
CPDEF=(X2) CPLA[X2]=(X1) CPDEF=(A2) CPLA[A2]=(X2) CPLA[A2]=(A1)
Constraints
• The availability of cascading is option-based (refer to " Preconditions [Page 268] ").
• Cascades between couplings of existing coupling functions and couplings of generic
couplings are not possible.
• A ring coupling is not permitted. It is rejected with alarm 16778:
"Ring coupling with following axis FAx and leading axis LAx not allowed"
(A ring coupling occurs when a following axis is also a leading axis of its own coupling
module or a leading axis in a series-connected coupling module).
5.5.7

Compatibility

5.5.7.1

Adaptive cycles

Adaptive cycles
The provision of adaptive cycles as fixed component of the NCK software ensures a syntactic
and functional compatibility to coupling calls of existing coupling types (coupled motion,
master value coupling, electronic gearbox and synchronous spindle). This means that as long
as the manufacturer/user does not need new coupling characteristics, it is not necessary to
modify present coupling calls and any dependent application components (e.g. PLC
evaluation of coupling signals).
Special Functions
Function Manual, 09/2011, 6FC5397-2BP40-2BA0
M3: Coupled axes
5.5 Generic coupling
315