Siemens sinumerik 840D sl Function Manual page 332

Detailed description
2.5 Generic coupling
2.5.5 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)
Boundary conditions
• Availability of cascading depends on selected options (see topic "Preconditions" in
• Cascades between couplings of existing coupling functions and couplings of generic
• A ring coupling is not permitted. It is rejected with alarm 16778:
112
"Summarized Descriptions").
couplings are not possible.
"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: Axis Couplings and ESR (M3)
Function Manual, 11/2006, 6FC5397-2BP10-2BA0