Siemens SINUMERIK 840D sl Programming Manual page 548

Path traversing behavior
8.4 Conditionally interruptible program sections (DELAYFSTON, DELAYFSTOF)
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.
The following features regulate the interaction between NC commands DELAYFSTON and
DELAYFSTOF with nesting and end of subroutine:
1. DELAYFSTOF is activated implicitly at the end of the subroutine in which DELAYFSTON is
2. DELAYFSTON stop delay section has no effect.
3. If subroutine 1 calls subroutine 2 in a stop delay section, the whole of subroutine 2 is a
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called.
stop delay section. DELAYFSTOF in particular has no effect in subroutine 2.
Note
REPOSA is an end of subroutine command and DELAYFSTON is always deselected.
If a "hard" stop event coincides with the "stop delay section", the entire "stop delay
section" is deselected! Thus, if any other stop occurs in this program section, it will be
stopped immediately. A new program setting (new DELAYFSTON) must be made in order
to start a new stop delay section.
If the Stop key is pressed before the stop delay section and the NCK must travel into the
stop delay section for braking, the NCK will stop in the stop delay section and the stop
delay section will remain deselected!
A stop delay section entered with an override of 0% will not be accepted!
This applies to all "soft" stop events.
STOPALL can be used to decelerate in the stop delay section. A STOPALL, however,
immediately activates all other stop events that were previously delayed.
Programming Manual, 06/2009, 6FC5398-2BP20-0BA0
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