Siemens SINUMERIK 840D sl Programming Manual page 413

As shown in the illustration, the user presses "Stop" in the stop delay section and the NC
starts deceleration outside the stop delay section, i.e., in block N100. That causes the NC to
stop at the beginning of N100.
...
N99 MY_LOOP:
N100 G0 Z200
N200 G0 X0 Z200
N300 DELAYFSTON()
N400 G33 Z5 K2 M3 S1000
N500 G33 Z0 X5 K3
N600 G0 X100
N700 DELAYFSTOF()
N800 GOTOB MY_LOOP
Details on SERUPRO type block searches and feeds in conjunction with G331/G332 feed
for tapping without compensating chuck, see
/FB1/ Function Manual, Basic Functions; Mode Group, Channel,
Program Operation Mode (K1)
/FB1/ Function Manual, Basic Functions; Feedrates (V1).
Advantages of the stop delay section
A program section is processed without a drop in velocity.
If the user aborts the program after a stop with RESET, the aborted program block is after
the protected section. This program block is a suitable search target for a subsequent block
search.
The following main run axes are not stopped as long as a stop delay section is in progress:
• Command axes and
• Positioning axes that travel with POSA
Parts program command G4 is permitted in a stop delay section whereas other parts
program commands that cause a temporary stop (e.g., WAITM) are not permitted.
Like a path movement, G4 activates the stop delay section and/or keeps it active.
Example: Feedrate intervention
If the override is reduced to 6% before a stop delay section, the override becomes active in
the stop delay section.
If the override is reduced from 100% to 6% in the stop delay section, the stop delay section
is completed with 100% and beyond that the program continues with 6%.
The feed disable has no effect in the stop delay section; the program does not stop until after
the stop delay section.
Overlapping/nesting:
If two stop delay sections overlap, one from the NC commands and the other from machine
data MD 11550: STOP_MODE_MASK, the largest possible stop delay section will be
generated.
Job planning
Programming Manual, 03/2006 Edition, 6FC5398-2BP10-1BA0
9.7 Conditionally interruptible program sections (DELAYFSTON, DELAYFSTOF)
Path traversing behavior
9-47