Siemens sinumerik 840D sl Function Manual page 248

Detailed description
2.2 Curve tables
Insufficient memory
If a curve table cannot be created, because sufficient memory is not available, then the
newly created table is deleted immediately after the alarm.
If insufficient is available, then one or more table(s) that is/are no longer required can be
deleted with CTABDEL or, alternatively, memory can be reconfigured via machine data.
Temporary curve table
When a curve table is created, a temporary curve table is set up first in memory, which is
then extended block by block. Finally (CTABEND), the table is checked for consistency. The
temporary table is converted to a table that can be used in a coupling only if it is found to be
consistent.
Same table number
A new curve table may have the same number as an existing table. The new curve table
then overwrites the existing table with the same number. This is done only if the new curve
table does not contain any errors. If an error is detected in the new table, the old table is not
overwritten.
If the user wishes to have the option of overwriting an existing curve table without deleting it
first, then he will need to dimension the table memory so that there is always enough extra
memory to accomodate the table to be overwritten.
Overwriting curve tables
Curve tables that are not active in a master value coupling and are locked with CTABLOCK()
may be overwritten.
Deleting curve tables
Curve tables that are not active in a master value coupling and are locked with CTABLOCK()
may be overwritten.
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Special functions: Axis Couplings and ESR (M3)
Function Manual, 11/2006, 6FC5397-2BP10-2BA0