Siemens SINUMERIK 840D sl Programming Manual page 549

System variables
A stop delay section can be detected in the parts program with $P_DELAYFST. If bit 0 of the
system variables is set to 1, parts program processing is now in a stop delay section.
A stop delay section can be detected in synchronized actions with $AC_DELAYFST. If bit 0 of
the system variables is set to 1, parts program processing is now in a stop delay section.
Compatibility
Default of machine data MD 11550: STOP_MODE_MASK Bit 0 = 0 triggers implicit stop delay
section during a G code group G331/G332 and when a path movement or G4 is
programmed.
Bit 0 = 1 permits a stop during a G code group G331/G332 and when a path movement or
G4 has been programmed (behavior until SW 6). The DELAYFSTON/DELAYFSTOF
commands must be used to define a stop delay section.
Job Planning
Programming Manual, 06/2009, 6FC5398-2BP20-0BA0
8.4 Conditionally interruptible program sections (DELAYFSTON, DELAYFSTOF)
Path traversing behavior
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