Siemens SINUMERIK 840D sl Function Manual page 263

Features
The NCK-SPL program has the following features:
● The program can be started manually with NC START during commissioning.
● The following applies once the program has been started:
– The synchronous actions assigned an ID No. are cyclically executed in the IPO clock
– The synchronized actions assigned the keyword IDS remain active even after the
– In order to check the program, the status of the active synchronous actions (operating
– The program can be modified during commissioning. It must then be re-started.
– The NCK-SPL program is saved in the NCK path_N_CST_DIR as sub-routine
● The images of the PLC safety variables ($A_INSIP(D), $A_OUTSIP(D), $A_INSEP(D),
$A_OUTSEP(D), $A_MARKERSIP(D)) are required for the simulation (on the NC side) of
an SPL. These can be used to develop the SPL step-by-step. They can only be read by
the NCK.
Protective mechanisms
● The synchronized action IDs used for the NCK-SPL are protected from being influenced
by the PLC or other programs using MD $MN_PREVENT_SYNACT_LOCK. To activate the
protection, the number range of the synchronized action IDs used in the SPL program must
be entered into the two fields of machine data $MN_PREVENT_SYNACT_LOCK. It is then
no longer possible to change these synchronized actions (CANCEL, LOCK have no effect)
once _N_SAFE_SPF has been started.
● When changing machine data $MN_PREVENT_SYNACT_LOCK[0,1] from zero to values
not equal to zero, an option set for the SPL inputs and outputs and an SPL file under /
_N_CST_DIR/_N_SAFE_SPF, then Alarm 27098 "SPL commissioning phase complete" is
initiated. This can only be acknowledged with a power on and should be used as information
for the user, that
a) the SPL protective mechanisms (see Table ) are activated
b) a restart is necessary in order to activate these protective mechanisms.
● System variables $A_OUTSI, $A_OUTSID, $A_OUTSE, $A_OUTSED, $A_MARKERSI,
$A_TIMERSI, $A_CMDSI, $A_FSDP_ERR_REAC, $A_FRDP_ERR_REAC and
$A_FRDP_SUBS are protected from being written to by programs other than the NCK-SPL
(/_N_CST_DIR/_N_SAFE_SPF). If an error occurs, Alarm 17070 "Channel %1 block %2
data item write-protected" is output.
Safety Integrated
Function Manual, 12/2017, 6FC5397-4BP40-6BA1
cycles (modal)
operating mode has been changed or NC-STOP/NC RESET
area "Machine", soft key "Synchronized actions") can be displayed.
"_N_SAFE_SPF" (HMI view: Standard cycles / SAFE.SPF). Other sub-routine names
are not permitted.
Connecting sensors and actuators
8.5 Safe programmable logic
263