Coupling Cascading - Siemens SINUMERIK 840D sl Function Manual

Example
Program code
CPMALARM[X2]='H300'
8.5.6

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)
Supplementary conditions
● The availability of cascading is option-based (see Section "Requirements (Page 368)").
● 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).
Special functions
Function Manual, 01/2015, 6FC5397-2BP40-5BA2
Comment
; The 22025 and 22026 alarms are suppressed for the cou-
pling of the X2 following axis.
M3: Coupled axes
8.5 Generic coupling
417