Siemens SINUMERIK 840D sl Function Manual page 689

Syntax check
All program errors that can be corrected by means of a compensation block are detected
during preprocessing. In addition, when the program includes branches and check structures,
a check is made to ensure that the branch destinations are present and that structures are
nested correctly.
Branch destinations and labels must be unique in the program.
After the errors detected during preprocessing have been corrected, preprocessing must be
started again by means of an NCK POWER ON.
Special Functions
Function Manual, 09/2011, 6FC5397-2BP40-2BA0
V2: Preprocessing
18.3 Program call
689