Siemens sinumerik 840d Programming Manual page 316

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Path Traversing Behavior

9.3 Curve tables, CTABDEF, CTABEND, CTAB, CTABINV

Additional notes

With the system variable $P_CTABDEF it is possible

to query from inside a part program whether a curve

table definition is active.

The part program section can be used as a curve

table definition after excluding the statements and

therefore as a real part program again.

Programming example

A program section is to be used unchanged for

defining a curve table. The command for preprocess

stop STOPRE can remain and is active again

immediately as soon as the program section is not

used for table definition and CTABDEF and

CTABEND have been removed:

CTABDEF(Y,X,1,1)

IF NOT ($P_CTABDEF)

Curve tables and various operating states

During active block search, calculation of curve

tables is not possible. If the target block is within the

definition of a curve table, an alarm is output when

CTABEND is reached.

SINUMERIK 840D/840Di/810D/FM-NC Programming Guide Advanced (PGA) – 04.00 Edition

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