Siemens sinumerik 840D sl Function Manual page 334

Detailed description
2.5 Generic coupling
Memory location
Adaptive cycles are stored in the directory "CST".
User specific adaptive cycles
If necessary (functional completion) the user can copy an adaptive cycle to the directory
"CMA" or "CUS" and apply changes there. When reading adaptive cycles, the sequence
CUS → CMA → CST is observed and cycle variants are taken over on a first found basis, i.e.
the adaptive cycles copied into the directory CMA/CUS by the user are selected on a priority
basis.
Note
When upgrading the NCK software, a log file is saved in the "CST" directory (Changelog),
indicating necessary changes of the adaptive cycles.
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Special functions: Axis Couplings and ESR (M3)
Function Manual, 11/2006, 6FC5397-2BP10-2BA0