Nck-Spl Program - Siemens SINUMERIK 840D sl Function Manual

Connecting Sensors/Actuators
7.3 Safe programmable logic (SPL)
7.3.3 NCK–SPL program
Description
The NCK–SPL program is written as an NC program (ASUB) with synchronized
actions.
Features
The NCK–SPL program has the following features:
S The program can be started manually with NC START during commissioning.
S The following applies once the program has been started:
– The synchronous actions assigned an ID No. are cyclically executed in the
IPO clock cycles (modal)
– The synchronous actions assigned the keyword IDS remain active even af-
ter the operating mode has been changed or NC–STOP/NC RESET
– In order to check the program, the status of the active synchronous actions
(operating area "Machine", soft key "Synchronous actions") can be dis-
played.
– 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–rou-
tine "_N_SAFE_SPF" (HMI view: standard cycles/SAFE.SPF).
Other sub–routine names are not permitted.
S The images of the PLC safety variables ($A_INSIP(D), $A_OUTSIP(D), $A_IN-
SEP(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
S The synchronous action IDs used for the NCK–SPL are protected from being
influenced by the PLC or other programs using MD $MN_PREVENT_SYN-
ACT_LOCK. To activate the protection, the number range of the synchronous
action IDs used in the SPL program must be entered into the two fields of ma-
chine data $MN_PREVENT_SYNACT_LOCK. It is then no longer possible to
change these synchronous actions (CANCEL, LOCK have no effect) once
_N_SAFE_SPF has been started.
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SINUMERIK 840D sl/SINAMICS S120 SINUMERIK Safety Integrated (FBSI sl) – 05.2008 Edition
© Siemens AG 2008 All Rights Reserved
05.08