Siemens SINUMERIK 840D sl Programming Manual page 380

Auxiliary function outputs
Function outputs in continuous-path mode
Function outputs before the traversing movements interrupt the continuous-path mode (G64/
G641) and generate an exact stop for the previous block.
Function outputs after the traversing movements interrupt the continuous-path mode (G64/
G641) and generate an exact stop for the current block.
Important: A wait for an outstanding acknowledgment signal from the PLC can also interrupt
the continuous-path mode, e.g. for M command sequences in blocks with extremely short
path lengths.
380
CAUTION
Programming Manual, 09/2011, 6FC5398-1BP40-2BA0
Fundamentals